UNITED STATES
 SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549

 FORM 10-K

 (Mark One)

 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended October 3, 2025
 or

 o
 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the transition period from to
 Commission File Number: 001-42176

 Amentum Holdings, Inc.
 (Exact name of registrant as specified in its charter)

 Delaware
 99-0622272

 (State or other jurisdiction of
 (I.R.S. Employer

 incorporation or organization)
 Identification No.)

 4800 Westfields Blvd., Suite #400
 Chantilly, Virginia 20151
 (Address principal executive offices)

 ( 703) 579-0410
 (Registrant's telephone number, including area code)

 Securities registered pursuant to Section 12(b) of the Act:

 Tile of each class
 Trading Symbol(s)
 Name of each exchange on which registered

 Common Stock, par value $0.01 per share
 AMTM
 New York Stock Exchange

 Indicate by check mark whether the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes. No o.
 Indicate by check mark whether the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o. No.

 Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes. No o.
 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes. No o.
 Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

 Large accelerated filer

 Accelerated filer
 o

 Non-accelerated filer
 o
 Smaller reporting company
 o

 Emerging growth company
 o

 If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o.
 Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report..
 If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o.
 Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b). o.
 Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o. No.
 The aggregate market value of common shares held by non-affiliates of the Registrant on March 28, 2025 was $ 4,396,836,997, based upon the closing price of the Registrant's common shares as quoted on the New York Stock Exchange composite tape on such date.
 As of November 14, 2025, there were 243,597,992 shares outstanding of Amentum Holdings, Inc. common stock, par value of $0.01 per share.

 DOCUMENTS INCORPORATED BY REFERENCE
 Part III of this Form 10-K incorporates by reference certain information from the Registrant's Proxy Statement to be filed with the Securities Exchange Commission (SEC) pursuant to Regulation 14A for the 2026 Annual Meeting of Stockholders.
 INFORMATION RELATING TO FORWARD-LOOKING STATEMENTS
 Certain information included or incorporated by reference in this Annual Report on Form 10-K may not address historical facts and, therefore, could be interpreted to be "forward-looking statements" as that term is defined in the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including projections of financial performance; statements of plans, strategies and objectives of management for future operations; any statement concerning developments, performance or industry rankings relating to products or services; any statements regarding future economic conditions or performance; any statements of assumptions underlying any of the foregoing; and any other statements that address activities, events or developments that the Company intends, expects, projects, believes or anticipates will or may occur in the future. Forward-looking statements may be characterized by terminology such as "believe," "anticipate," "expect," "should," "intend," "plan," "will," "estimates," "projects," "strategy" and similar expressions. These statements are based on assumptions and assessments made by the Company's management in light of its experience and its perception of historical trends, current conditions, expected future developments and other factors it believes to be appropriate. These forward-looking statements are subject to a number of risks and uncertainties that include but are not limited to the factors set forth under Item 1A, Risk Factors.
 Any such forward-looking statements are not guarantees of future performance, and actual results, developments and business decisions may differ materially from those envisaged by such forward-looking statements. The forward-looking statements included herein speak only as of the date of this Annual Report on Form 10-K. The Company disclaims any duty to update such forward-looking statements, all of which are expressly qualified by the foregoing.

 FORM 10-K

 Item 1.

 Business

 Item 1A.

 Risk Factors

 Item 1B.

 Unresolved Staff Comments

 Item 1C.

 Cybersecurity

 Item 2.

 Properties

 Item 3.

 Legal Proceedings

 Item 4.

 Mine Safety Disclosures

 Item 5.

 Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

 Item 6.

 [Reserved]

 Item 7.

 Management's Discussion and Analysis of Financial Condition and Results of Operations

 Item 7A.

 Quantitative and Qualitative Disclosures About Market Risk

 Item 8.

 Financial Statements and Supplementary Data

 Item 9.

 Changes in and Disagreements With Accountants on Accounting and Financial Disclosure

 Item 9A.

 Controls and Procedures

 Item 9B.

 Other Information

 Item 9C.

 Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

 Item 10.

 Directors, Executive Officers and Corporate Governance

 Item 11.

 Executive Compensation

 Item 12.

 Security Ownership of Certain Beneficial Owners and Management

 Item 13.

 Certain Relationships and Related Transactions

 Item 14.

 Principal Accountant Fees and Services

 Item 15.

 Exhibits and Financial Statement Schedules

 Item 16.

 Form 10-K Summary

 SIGNATURES

 Item 1. Business

 Business Overview
 Amentum Holdings, Inc. (herein referred to as "we", "our", "us", "the Company" and "Amentum"), a Delaware corporation, is a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, and customers in international and commercial markets.
 On September 27, 2024, Amentum was formed through the completion of a merger between the legacy Amentum business and a spin-off of the Jacobs Solutions Inc. ("Jacobs") Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (the "Transaction"). The Transaction brought together two premier government services companies with complementary capabilities and a deep understanding of our customers' missions and priorities developed over more than 100 years as trusted engineering and technical experts. We operate our business activities and report financial results as two reportable segments: Digital Solutions ("DS") and Global Engineering Solutions ("GES").
 Our history as a trusted partner to the U.S. federal government and our advanced engineering and technology expertise enable us to lead and support our customers' most complex programs. Our broad capabilities support technology-driven, full mission lifecycle solutions that align with modernization priorities for a wide array of customers across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We believe our scale and breadth of capabilities position us well in the marketplace as our customers' requirements increasingly necessitate a full lifecycle partner equipped with next-generation engineering solutions to solve their most complex challenges.
 Our workforce of approximately 50,000 continues to be rooted in a strong purpose-driven culture. Our mission-oriented and highly skilled personnel enable us to serve a diverse range of requirements for our customers. In the U.S., these customers include the Department of Energy ("DOE"), the Intelligence Community consisting of the National Intelligence Program ("NIP") and the Military Intelligence Program ("MIP"), the Department of War ("DOW"), the National Aeronautics and Space Administration ("NASA"), and the Department of Homeland Security ("DHS") as well as other government and certain commercial customers. We are also well-positioned internationally with employees in over 70 countries, supporting international customers and contracts in regions with growing mission demand, such as Europe and the Indo-Pacific, and with key allied government agencies, including the U.K. Ministry of Defence ("U.K. MOD"), the U.K. Nuclear Decommissioning Authority ("NDA") and the Australian Department of Defence ("Australian DOD"). We support these customers by providing solutions to pressing challenges, from energy transformation and environmental solutions to cybersecurity and digital modernization.
 Our solutions—backed by a robust network of engineers, cleared employees and technical subject matter experts—continue to be critical to our customers' priorities. These priorities include addressing global environmental challenges and supporting sustainable energy transformation, creating digital decision advantages, advancing Research, Development, Test, and Evaluation ("RDT&E") initiatives, and enhancing space superiority. Examples of our solutions addressing these priorities include design and development of new nuclear technologies for U.S. and international customers, threat recognition and analytics for the Intelligence Community, engineering advanced systems for the DOW, research and development solutions for the DHS, and science, engineering, and technology development for NASA. Across our customer set, our solutions span all aspects of the government lifecycle, including development, integration, and operations.
 We have a compelling industry platform of scale with excellent revenue visibility supported by $47.1 billion of backlog as of October 3, 2025 and attractive growth opportunities. Our scale is an asset that positions us as a turn-key solutions provider capable of pursuing our customers' largest and most complex contracts. The ability to pursue these contracts, while maintaining a large base of revenue in backlog, is supported by our agile business development engine. We believe our scale, efficiency and diversity enables Amentum to generate substantial free cash flow while driving growth.

 History
 On January 31, 2020, Amentum Joint Venture LP ("Amentum Equityholder") purchased the Management Services business of AECOM and formed Amentum Parent Holdings LLC ("Legacy Amentum") as the parent holding company of the acquired business. Through strategic acquisitions and refined business models, Legacy Amentum expanded its expertise to deliver a comprehensive suite of solutions. These included cutting-edge capabilities in intelligence analytics, counter-terrorism, supply chain management, aviation, business process optimization, and defense readiness.
 On September 27, 2024, Amentum became a public company through the consummation of the spin-off of the Jacobs Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (together referred to as "CMS") and merger with Legacy Amentum in a tax-efficient Reverse Morris Trust transaction. Prior to the spin-off, CMS reorganized under a newly formed company named Amazon Holdco Inc. ("CMS") and distributed a $911 million cash dividend payment to Jacobs,

 who then distributed, prior to the merger, approximately 80.95% of the outstanding shares of CMS common stock to Jacobs' shareholders on a pro rata basis. In connection with the completion of the merger, CMS was renamed Amentum Holdings, Inc. On September 30, 2024, Amentum began trading on the New York Stock Exchange under the ticker symbol "AMTM."
 Amentum's heritage stretches back to companies founded at the dawn of the twentieth century including EG&G, Morrison-Knudsen, Westinghouse Government Services, URS, Lear Siegler Services, DynCorp International LLC ("DynCorp"), Pacific Architects and Engineers ("PAE") and CMS. This legacy encompasses many notable achievements, including the design and development of the Hoover Dam, demilitarization of the United States' chemical weapons stockpile, and environmental management support following the Manhattan Project during World War II.
 Additionally, our predecessor companies served vital roles in innovative projects including the design, development, operations, and maintenance of first-of-their kind aerodynamic test facilities for the United States Air Force ("USAF"), supporting the development of NASA test facilities needed for the Apollo Program, designing the launch complex for the Space Shuttle, and supporting the next generation of human space exploration as a prime contractor for NASA's Artemis mission. We have also supported the clean energy transformation, playing a key role in the development of each of the existing nuclear power stations in the U.K. and in the remediation of complex nuclear sites across the U.S. and U.K.
 The composition of our business today reflects the evolving needs of the U.S. and allied governments for a contractor that can provide comprehensive solutions to address their most significant and complex challenges.

 Our Competitive Advantage
 Our broad-based contract positions across a diverse range of customers and missions allow Amentum to position the portfolio in areas of government funding tailwinds while mitigating risk during periods of transition. This stable and diversified base, when combined with our scale, serves as a strong foundation for continued growth. Our global reach is extensive with an employee presence in over 70 countries and 25% of employees positioned internationally. Our international customers benefit from our expansive technical capabilities, proven expertise and longstanding customer relationships. Each of these advantages help Amentum to win and execute our customers' largest and most complex missions.
 Our expertise is broadly applicable to many of the government's highest priority areas including command, control, communications, computer, combat systems, intelligence, surveillance and reconnaissance (collectively, "C5ISR"), RDT&E, energy, space, and digital modernization. Solutions in these areas include our environmental remediation and engineering capabilities supporting the DOE and the U.K. NDA, which are further expanding in support of customers pursuing emerging, new nuclear energy technologies; our digital modernization and cyber capabilities, which can be customized to current customers under existing programs; our expertise in space operations, developed via our longstanding trusted relationship with NASA, which will help foster the development of next-generation civil and commercial space programs; and our knowledge of emerging 5G technologies, which are primarily deployed for commercial customers today and may enhance our ability to improve government telecommunications systems.
 Amentum serves as a prime contractor across a diverse array of customers, capabilities and missions, especially as our customers increasingly migrate to a solutions-oriented procurement model. We believe our customers prefer the engineering and technological expertise of our highly skilled workforce that underpins these solutions. We take pride in our people and our culture—we foster an entrepreneurial approach to innovation and respond with agility to deliver exceptional performance.
 We will continue to drive success with our highly competent workforce. Our commitment to our people is reflected in our tagline "Advancing the Future Together", which will guide our operations for decades to come.

 Our Markets and Trends
 We provide solutions to a wide array of customers, primarily multiple departments and agencies within the U.S. federal government, as well as select international customers and commercial customers. We also provide our services to other prime contractors who have contracts with the U.S. federal government and other international customers where our capabilities deliver comprehensive solutions.
 Enhanced Leadership in Core Markets
 The U.S. federal government represents one of the world's largest customers of specialized engineering and technology solutions. Approximately 81% of the Company's revenues were derived through direct contracts with agencies of the U.S. Government for the year ended October 3, 2025.
 Our global markets represent a substantial opportunity, marked by longstanding leadership in the U.K. energy and defense markets and the Australian defense market. We possess unique experience that includes the management of the U.K.'s principal facility for low-level waste disposal and the development of solutions across environmental remediation projects. The trilateral security partnership that enables the U.S. and U.K. to assist Australia in acquiring nuclear-powered submarines ("AUKUS") also represents a sizeable area of growth. We have extensive experience with AUKUS, including: specialized research and

 development ("R&D") activities with the DOW's Underwater Launch Test Facility; research and technical services with the U.K.'s naval nuclear propulsion program; and positioning as one of four strategic partners for the Australian DOD Capability Acquisition and Sustainment Group supporting the government with all of the platforms and systems required to support their national defense. We have enduring, trusted relationships with the United Kingdom and Australia, spanning many decades in the U.K. and nearly 30 years in Australia.
 We believe our core technical expertise and technology solutions will also enable us to continue serving commercial customers in the areas of commercial space, cybersecurity, nuclear power and telecommunications.
 Shift Toward Modernization
 Due to our scale and capabilities across key government modernization priorities, we believe that Amentum has an advantage in creating digital decision advantages, advancing RDT&E initiatives, delivering space superiority, addressing global environmental challenges, and supporting nuclear power expansion globally. The breadth of our solutions enables us to capitalize on these modernization priorities from early-stage development through sustainment.
 Indexed to High Growth Sub-Markets
 Within our core markets, we identified key areas that are expected to experience outsized growth and are central to our growth strategy. Our technology capabilities, agility, track record of renewal rates and new program wins make Amentum a logical partner for customers in these key growth markets, including cybersecurity; hypersonics; autonomy; space-based missile defense; environmental remediation and nuclear power; and deployment of 5G technologies. The identification of additional growth areas is a key pillar of our strategy as we continue to enhance our capabilities to access new and emerging markets.
 We develop new technologies and innovative solutions for both government and commercial customers that are transferrable and tailorable across domains. We provide solutions to various commercial markets including commercial aerospace, space, automotive, and telecommunications. Our agility and technical expertise give us ample opportunity to apply solutions from our government customers to commercial customers, including leveraging digital modernization for commercial space to improve a manufacturer's operations and using our capabilities to streamline autonomous driving solutions for the automotive industry.

 Business Strategy
 We are active in market sectors that are large and fragmented, providing significant opportunities for continued business growth. We leverage our history of executing complex engineering and technology solutions for our largest customers to win new contracts with a business strategy that includes the following elements for both reportable segments:
 • Win and successfully execute the largest, most complex programs for the government across the energy and environmental, intelligence, space, defense, and civilian end-markets. The scale and diversity of our solutions, capabilities, geographies, workforce and contract vehicles are central to our strategy and position us for outsized growth with our customers. The contracts we hold allow us to strategically partner with our customers on innovative engineering and technology solutions creating a competitive advantage for us, providing the opportunity for on-contract growth. We believe the U.S. federal government is increasingly looking to large, diversified providers for comprehensive solutions, for which Amentum offers a breadth and depth of proven expertise that is unique in the government services industry.
 • Increase our penetration with existing, well-funded customers, where our current long-term contracts, backlog, and relationships provide a stable base for on-contract growth and expanded new opportunities. For example, Amentum has the opportunity to leverage a diverse set of digital modernization and cyber capabilities with longstanding government relationships to grow more broadly in the federal information technology market. We have successfully implemented this strategy with takeaway wins against longtime incumbents on Missile Defense Agency ("MDA"), the United States Space Force ("USSF"), and NASA programs. Our scale and capability set also provides broad access to major government Indefinite Delivery/Indefinite Quantity ("IDIQ") contract vehicles providing us with access to opportunities for on-contract growth.
 • Expand into high-growth and adjacent markets by leveraging technologies and innovation backed by our highly skilled workforce, mission expertise, and ecosystem of trusted partners. Some of these high growth areas include hypersonics, autonomous systems, advanced energy solutions, and artificial intelligence/machine learning. We believe our extensive RDT&E capabilities and our customers' increasing focus on efficiency will enable us to compete effectively. Our ability to replicate modernization efforts across new end markets and various stages of the government lifecycle will expand our addressable market and enable growth in excess of our customers' underlying budgets.
 • Utilize core competencies to drive revenue synergies generated from our enhanced capabilities, relationships, and past performance credentials. These core competencies position us to bid and win opportunities, and our increased scale and competitive cost structure drive operational efficiencies, without compromising the quality of our solutions. Examples of areas where we combine past performance qualifications with longstanding customer relationships

 include intelligence analytics, C5ISR engineering & integration, and digital modernization. Our comprehensive offerings support the U.S. and its allies in maintaining a competitive advantage, utilizing innovative solutions to remain well ahead of the technology curve.
 • Apply our business development engine to continue winning the largest and most complex programs. We complement our strong base of contracts with a proven business development engine that allows us to successfully bid and win new awards. We tailor each proposal to the needs of our customers, including providing the customer on-contract access to additional solutions as needed. We invest in and maintain a high level of collaboration between our operations and business development teams, which helps us retain our long-term contracts and ensure that we are integrating technological advances into our business development process.
 • Strategic capital allocation through our asset-light business model and disciplined capital allocation policy will prioritize reducing debt in the near-term and delivering long-term value to stakeholders.

 Key Capabilities
 We leverage our complementary suite of capabilities to capture large, complex contracts for customers in the U.S. government, international and commercial markets.
 Environmental Solutions and Energy Transformation
 Amentum has a long history of providing innovative solutions to energy and environmental customers. We work to make the world safer, more secure and cleaner by eliminating environmental hazards and strengthening national security. Our capabilities include environmental remediation, site revitalization, nuclear non-proliferation and per- and polyfluoroalkyl substances ("PFAS") solutions. Our core services within this capability are focused on environmental remediation for the UK NDA and DOE across various sites, including at Sellafield, Savannah River, Hanford, Oak Ridge, Portsmouth and the Idaho Cleanup Project. We have extensive experience in research and lab operations, fusion energy and other advanced energy technologies. In Europe, we continue to provide high-value consulting and proprietary technologies through the entire government acquisition lifecycle, including design, operations management, decommissioning and regeneration solutions, as well as serving multiple government IDIQs remediating the effects of radioactive material from legacy sites and programs. Amentum has also been involved in the development of technology that will enable the global nuclear resurgence, as we are currently working with several different Original Equipment Manufacturers ("OEMs") to develop Advanced Modular Reactors ("AMRs") and Small Modular Reactors ("SMRs").
 Space Solutions
 We specialize in delivering comprehensive "launch to landing" solutions on highly technical and mission-critical contracts. As a leading services provider for NASA, we provide solutions across the full spectrum of design, base, mission and launch operations. Our space solutions and engineering capabilities include ground systems development, launch and landing operations, satellite payloads and sensor engineering. These are demonstrated through various contracts including NASA's Consolidated Operations, Management, Engineering and Test ("COMET") contract and NASA's Johnson Space Center Engineering, Technology, and Science ("JETS") II contract. Our core capabilities of launch support, digital modernization, on-orbit operations, program management and systems engineering are directly aligned to the high growth budget priorities at NASA, the MDA and the USSF. In the longer term, we see additional opportunities in providing similar services and capabilities to a broader customer base, including other government agencies and commercial entities accessing space.
 Intelligence, Cyber and Digital Engineering
 We are at the forefront of wide-ranging cyber, digital services and modern software engineering providing enhanced data ingestion, collection, security and storage solutions for government agency customers spanning the Intelligence Community, the DOW and federal civilian markets.
 Our intelligence capabilities support the Intelligence Community in addition to the greater defense and space community with demonstrated ability to provide technology-based solutions including intelligence analytics, intelligence collection training, C5ISR, threat recognition and analytics, in addition to intelligence operations management. Our ability to combine in depth analytics with next-generation technology provides critical and innovative solutions with notable expertise across the intelligence collection domain including signals intelligence, human intelligence, and geospatial intelligence.
 Our cyber capabilities extend across multiple markets and enable greater delivery of next generation solutions into multi-domain operations across our government customers. Our offerings focus on the information environment, which includes assets such as networks, technology, infrastructure, and data. Specifically, our services continue to include development, security, and operations, full lifecycle software development, data integration and analytics, information assurance, digital maintenance, robotic and process automation, as well as physical and cyber resiliency.

 Our digital engineering and integration capabilities support a variety of our customers' missions. Our Model-Based System Engineering ("MBSE") solutions span the lifecycle from a document-centric approach to a model-centric approach, using formalized digital models and our proven digital engineering playbook. These solutions are aligned with key DOW focus areas including the National Defense strategy: a digital engineering strategy focused on modernizing defense systems and speed of delivery to be able to fight and win the wars of the future. We also create virtual environments that enable advanced simulation techniques to evaluate the performance efficacy of candidate future systems.
 Our intelligent asset management solutions enhance our customers' return on investment as we address every aspect of asset management from concept to retirement. We provide comprehensive, technology-based supply chain management and sustainment solutions that are critical to helping our customers drive long-term cost reductions. In addition, our leading-edge remote expert technology and our global positioning within all DOW geographical areas of responsibility ("AORs") afford us the ability to provide timely support to the urgent needs of our U.S. federal government customers and allied partners around the world.
 We provide lifecycle IT services as a mission partner, including both enterprise IT and mission IT with embedded digital transformation upgrades. Our services include network engineering, platform engineering, unified communications engineering, infrastructure optimization, and managed services migration.
 Research, Development, Test and Evaluation
 Our leading RDT&E capabilities provide our customers with advanced solutions in R&D engineering, testing, evaluation and training. These diverse capabilities include rapid prototyping, integrated sustainment and advanced engineering solutions. We continue to be a key provider of design, delivery and operations of advanced mission systems engineering and test infrastructure across the DOW. Our strength in these capabilities is evident through alignment with key government growth trends including joint domain operations (through our multi-domain live virtual and constructive ("LVC") solutions) and emerging regions. We continue to be positioned at the forefront of regional-based innovative advancements (such as the United States Indo-Pacific Command ("INDOPACOM")) that will be required for the U.S. and allied nations to keep their competitive advantage against near-peer adversaries.

 Contracts
 We have been awarded contracts across a diverse group of customers across the end markets we serve. Our contracts represent approximately $47.1 billion worth of backlog as of October 3, 2025 providing expected stability to our business.
 We contract with our customers generally under one of three types of price structures: cost-plus-fee, fixed-price and time-and-materials contracts.
 • Cost-plus-fee contracts provide for reimbursement of our direct contract costs and allocable indirect costs, plus a fee (contract profit). Some of our cost-plus-fee contracts have award fee or incentive fee components, which are awarded, subject to the attainment of pre-specified thresholds, such as targets for factors like cost, quality, schedule, and performance, that are stipulated in each contract.
 • Fixed-price contracts provide for a predetermined price for specific solutions. These contracts offer us potential increased profits if we can complete the work at lower costs than planned.
 • Time-and-materials contracts typically provide for negotiated fixed hourly rates for specified categories of direct labor plus reimbursement of other direct costs. On time-and-materials contracts, we assume the risk of providing appropriately qualified staff to perform these contracts at the hourly rates set forth in the contracts over their period of performance.
 Our contract mix by type, as a percentage of each reportable segment and total Amentum revenues, is indicated in the table below. As a result of the merger with CMS, the contract mix by type, as a percentage of revenues, may not be directly comparable.

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 Cost-plus-fee
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Fixed-price
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Time-and-materials
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Total
 %
 %
 %
 %
 %
 %
 %
 %
 %

 We note that substantially all of our contracts, including our U.S. federal government contracts, are subject to cancellation, termination, or suspension at the discretion of the customer, and may be subject to changes in the scope of services to be provided, as well as adjustments to the costs relating to the contracts, and may be subject to other contingencies such as congressional appropriations.

 Competitors
 We compete against well-established corporations as well as smaller, more specialized companies that concentrate their resources on particular areas. Many contracts require teaming relationships and strategic partnerships that allow us to both partner with competitors while at the same time competing in other areas. We compete on various factors, including technical capabilities, successful performance history, qualified/security- cleared personnel, reputation with customers, price, geographic presence, and size.
 Amentum's primary competitors include Booz Allen Hamilton Inc., CACI International Inc., KBR Inc., Leidos Holdings Inc., ManTech International Corporation, Parsons Corporation, Peraton Corporation, Science Applications International Corporation and V2X, Inc. Our domestic competition also includes large defense contractors such as Boeing Co., BAE Systems plc, General Dynamics Corporation, L3Harris Technologies Inc., Lockheed Martin Corporation, Northrop Grumman Corporation and RTX Corporation. In our U.K. defense market, our competitors include Babcock International Group plc, BAE Systems plc, Mott MacDonald Group Limited, Serco Group plc and Mace Group. Competitors for our global environmental business include AtkinsRealis, Bechtel Global Corporation, BWX Technologies Inc., Honeywell International Inc., Huntington Ingalls Industries, Inc., Fluor Corporation and Westinghouse Electric. We also compete against small businesses that cater to specific customers, capabilities and geographies.

 Human Capital Management
 Our people are the core of our success. With approximately 50,000 employees over 70 countries, our human capital strategy is focused on attracting, developing, and retaining top talent aligned with our values and client needs. We provide comprehensive onboarding, continuous learning, and performance management systems to ensure every employee thrives. By fostering a culture of innovation and upskilling, we maintain a workforce that is agile, engaged, and equipped to drive Amentum's mission forward.
 Culture and Values
 Amentum's culture is built on innovation, excellence, courage, collaboration, safety, and well-being. These values guide our decision-making and shape interactions across the company. We integrate these principles into leadership development, ethical decision-making, and people-first initiatives. Through leadership programs and employee engagement activities, we aim to empower employees to innovate and contribute to Amentum's collective success.
 Health and Safety
 Amentum envisions a safer, smarter, cleaner world and that vision underpins our fierce commitment to environmental, health, and safety ("EHS") excellence. Protecting our people, clients, and the communities we serve and driving sustainable business practices is not just the right thing to do, it is essential to our success.
 We know that "success starts with safety" because we have observed the correlation between excellence in safety and both improved financial performance and customer satisfaction. Our EHS principles of excellence shape our organizational culture, reinforce leadership commitment, boost employee engagement, improve work planning, guide risk-based decision-making, and facilitate rigorous performance monitoring. These elements contribute to reducing risks and substantially enhancing our company's reliability. As a result, we consistently meet our commitments on time and on budget, while avoiding unforeseen and undesirable outcomes.
 Talent Acquisition
 Our talent acquisition strategy is aligned with our mission to drive innovation and operational excellence. We have expanded and intensified our recruitment efforts to meet the evolving needs of our growing global operations, with a focus on attracting top technical talent and building leadership capacity. Through strategic partnerships with leading educational institutions, professional organizations, community groups, and military-focused programs, we've built a robust talent pipeline that reflects the diversity of the markets we serve and the unique needs of our clients.
 Our recruitment process is rigorous, leveraging advanced analytics and AI-driven tools alongside best-in-class practices to identify top talent. We believe that attracting and retaining the best talent is critical to our success, and we remain committed to providing a workplace where all employees can continuously grow and contribute their best.
 Career Mobility, Development, and Growth

 At Amentum, we believe continuous learning and development are essential to both individual and organizational success. Our learning and development programs are designed to provide employees with the skills and knowledge they need to excel in their current roles and to prepare them for future opportunities within the company.
 Career mobility is a key component of our talent management strategy. We encourage employees to explore different roles within the company and to take advantage of opportunities for lateral moves, promotions, and international assignments. Our internal career platform is designed to facilitate career mobility, providing employees with visibility into available opportunities and the resources they need to pursue them. We are committed to supporting the growth and development of our employees, and we believe that by investing in their success, we are investing in the future of Amentum.
 Total Rewards, Benefits, and Wellness
 We offer a comprehensive total rewards package designed to attract, retain, and motivate employees. Our total rewards strategy includes competitive compensation, performance-based incentives, and a wide range of benefits which support the health, well-being, and financial security of our employees.
 Our benefits package includes a variety of health insurance options, robust retirement savings plans, generous paid time off, and flexible work arrangements. Additionally, we offer mental health support, financial services planning, and a variety of wellness programs, including fitness challenges, health screenings and an employee assistance program. We believe by offering a comprehensive and competitive total rewards package, we can attract and retain the best talent, enhance employee engagement, and support the overall well-being of our workforce.
 Performance Management
 Amentum's performance management system aligns individual performance with company goals, fostering continuous improvement and recognition. Our process includes annual reviews, continuous feedback, and new tools for tracking progress. Recognition programs celebrate both individual and team achievements, strengthening engagement and driving high performance across the organization.
 Leadership
 Leadership is at the heart of our success. We are committed to developing leaders who embody our core values and are capable of driving innovation, effectively managing change, and inspiring their teams. Our leadership development and mentorship programs are designed to equip leaders at all levels with the skills and knowledge they need to be effective in their roles and prepare them for future leadership opportunities.
 Our leadership philosophy is grounded in our commitment to ethical business practices, transparency, and accountability. We believe strong leadership is essential to achieving our strategic goals, and we are dedicated to developing dynamic leaders who can drive Amentum's success both today and in the future.

 Intellectual Property
 Our proprietary intellectual property portfolio covers products, technical solutions, consulting, methodologies, and know-how. Although we have selectively sought patent protection, Amentum's services and solutions do not generally depend on patent protection. The portfolio is protected by non-disclosure agreements and contractual arrangements, as well as one or more of the following: trade secret, patent, copyright, and trademark protections. Some of the company's intellectual property may contain licensed third-party and open-source components.
 For our work under U.S. federal government funded contracts and subcontracts, the U.S. federal government obtains certain rights to data, software and related information or intellectual property developed under such contracts or subcontracts. These rights may allow the U.S. federal government to disclose or license such data, software, and related information or intellectual property to third parties. When we are acting as a subcontractor, our prime contractor may also have certain rights to data, information, and products that we develop under the subcontract.

 Seasonality
 Our business may experience seasonality due to the U.S. federal government's fiscal year ending in the third calendar quarter, as well as the number of working days in a given quarter. U.S. federal government agencies may award extra tasks or complete other contract actions in the weeks before the end of a U.S. federal government's fiscal year to avoid the loss of unexpended funds, which may favorably impact our fiscal fourth quarter. In addition, revenues may be unfavorably impacted in the summer and holiday seasons as a result of a greater number of holidays and a higher utilization of vacation time.

 Business Segments and Major Customers
 We operate our business activities and report financial results as two reportable segments: Digital Solutions ("DS") and Global Engineering Solutions ("GES").

 The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients.
 The Global Engineering Solutions segment provides large-scale environmental remediation, nuclear power solutions, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations.
 The presentation of financial results as two reportable segments is consistent with the way the Company operates its business and the manner in which our chief operating decision maker ("CODM"), currently our Chief Executive Officer, manages the operations of the Company for purposes of allocating resources and assessing performance.

 Environmental Matters
 Our business and mission success are dependent upon safeguarding our employees, contractors, customers and the communities in which we work. We support our customers and communities by protecting the environment through the pursuit and implementation of sustainable business practices that enhance our operational capabilities. To that end, Amentum's management and administration of environment, health and safety processes for operational execution have been certified to the ISO 14001 standard.
 Amentum's operations are subject to various foreign, federal, state and local environmental protection and health and safety laws and regulations. Although we currently are not aware of any material environmental or regulatory compliance costs or liabilities, or any risks associated with climate change that would be materially adverse to us, we are continually engaged in the process to better understand those risks and liabilities. It is possible that we may incur material costs or liabilities in the future. These regulations and risks are described in more detail under "Risk Factors."
 Amentum is committed to being a good steward of the environment. Actions Amentum is taking to reduce the environmental impact of its activities include increasing the number of electric vehicles in our fleet, improving the energy efficiency of our buildings and implementing a centralized fleet program that will optimize the management of owned and leased vehicles to reduce greenhouse gas ("GHG") emissions.

 Regulatory Matters
 As a government contractor, our business is heavily regulated and, as a result, our need for business and employee support for regulatory compliance is significant. Our industry is governed by various laws and regulations, including but not limited to laws and regulations relating to the formation, administration, and performance of government contracts; the security and control of information and information systems; international trade compliance; combatting human trafficking; and the mandatory disclosure of "credible evidence" of criminal law violations or receipt of significant overpayments. Failure to ensure regulatory compliance may lead to civil or criminal penalties, termination of our government contracts, and/or suspension or debarment from contracting with government customers.
 Contracts with the U.S. federal government are subject to a multitude of regulatory requirements, including but not limited to the Federal Acquisition Regulation ("FAR"), which mandates uniform policies and procedures for U.S. federal government acquisitions and purchased services and governs the majority of our contracts. Individual agencies may also have regulations that supplement the FAR and with which we must also comply. We are also subject to other federal and state laws and regulations, including those that: (a) require certification and disclosure of cost or pricing data in connection with contract negotiations; (b) govern reimbursement rights under cost-based contracts; (c) allow the government and whistleblowers filing on behalf of the government to pursue treble damages, civil penalties, and sanctions for the provision of false or fraudulent claims to the U.S. federal government; (d) regulate wages and fringe benefits paid to certain employees on U.S. federal government contracts; and (e) restrict the use, dissemination and exportation of products and information for national security purposes. These laws include the False Claims Act, the Procurement Integrity Act, the Service Contract Act, the Davis Bacon Act, Cost Accounting Standards, and associated implementing regulations.
 Our work for customers in jurisdictions outside the United States is subject to substantially equivalent laws and regulations as those discussed above.

 Available Information
 Our telephone number is (703) 579-0410 and our website can be accessed at www.amentum.com. We make our web site content available for information purposes only. It should not be relied upon for investment purposes, nor is it incorporated by reference into this Annual Report on Form 10-K.
 Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), are made available free of charge on our website at www.amentum.com as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Documents filed by us with the SEC can also be viewed at www.sec.gov.

 Item 1A. Risk Factors
 You should carefully consider the risks described below, together with all of the additional, following risks and other information contained in this Annual Report on Form 10-K, including Part II - Item 7 - Management's Discussion and Analysis of Financial Condition and Results of Operations. The risks described below are not the only risks facing us. Any of the following risks could materially and adversely affect our financial condition, results of operations or cash flows, and the actual outcome of matters as to which forward-looking statements are made in this Annual Report.

 Risk Factor Summary
 This risk factor summary contains a high-level summary of risks associated with our business. It does not contain all of the information that may be important to you, and you should read this risk factor summary together with the more detailed discussion of risks and uncertainties set forth following this summary. A summary of our risks includes, but is not limited to, the following:
 Risks Related to Our Business and Industry
 • We generate a significant portion of our revenues from contracts with the U.S. federal government. If the U.S. federal government significantly decreased or ceased doing business with us, our business, financial condition and results of operations would be materially and adversely affected.
 • Our U.S. federal government contract work is regularly reviewed and audited by the U.S. federal government, U.S. federal government auditors and others, and these reviews can lead to withholding or delay of payments to us, non-receipt of award fees, legal actions, fines, penalties and liabilities and other remedies against us.
 • A delay in the completion of the federal government's budget process, a prolonged continuing resolution or government shutdown, a decline in the federal government budget, changes in spending or budgetary priorities or delays in contract award may materially adversely affect our business, financial condition and results of operations.
 • We engage in a highly competitive business. If we are unable to compete effectively, we could lose market share and our business and results of operations could be negatively impacted.
 • Our results of operations depend on the award of new contracts and the timing of the award of these contracts.
 • Continuing elevated inflation, rising or continued high interest rates, and/or costs could reduce the demand for our services as well as decrease our profit on our existing contracts, in particular with respect to our fixed-price contracts.
 • Many of our work sites are workplaces with inherent safety and environmental risks. The occurrence of an accident or safety incident involving employees, contractors or others can result in injuries, disabilities or even loss of life, which could expose us to significant financial losses and reputational harm, as well as civil and criminal liabilities.
 • The nature of our contracts, particularly any fixed-price contracts, subjects us to risks of cost overruns.
 • Our failure to meet performance requirements or contractual schedules could adversely affect our business, financial condition and results of operations.
 • The contracts in our backlog may be adjusted, canceled or suspended by our customers and, therefore, our backlog is not necessarily indicative of our future revenues or earnings.
 • The provision of our services may expose us to significant monetary damages or even criminal violations in the event of liabilities resulting from our activities, including noncompliance with regulatory requirements, and our insurance policies may not provide adequate coverage, which could have a material adverse impact on our business, financial condition, and results of operations and damage our reputation.
 • Employee, agent or partner misconduct, or our overall failure to comply with laws or regulations, could weaken our ability to win contracts, which could result in reduced revenues and profits.
 • Cybersecurity or privacy breaches, or systems and information technology interruption or failure could adversely impact our ability to operate or expose us to significant financial losses and reputational harm.
 • If we do not have adequate indemnification for our nuclear services, or business is slowed by the extensive regulatory processes for approval and licensing for new and existing nuclear technologies or socio-political opposition to nuclear-related technology and activities, it could adversely affect our business, financial condition and results of operations.
 • Uncertainty over global tariffs, or the financial impacts of tariffs, may negatively impact our results.
 Risks Related to International Operations

 • Our international operations are exposed to additional risks and uncertainties, including unfavorable political developments and weak foreign economies.
 • Changes in domestic and foreign governmental laws, regulations and policies, changes in statutory tax rates and laws, and unanticipated outcomes with respect to tax audits could adversely affect our business, profitability and reputation.
 • We work in international locations where there are high security risks, which could result in harm to our employees or unanticipated costs.
 Risks Related to Acquisitions, Investments, Joint Ventures and Divestitures
 • Our use of joint ventures, partnerships and strategic investments in entities exposes us to risks and uncertainties, many of which are outside of our control.
 • An impairment charge on our goodwill or intangible assets could have a material adverse impact on our financial position and results of operations.
 • Our business strategy relies in part on acquisitions and strategic investments to sustain our growth, as well as targeted divestitures. These transactions present certain risks and uncertainties.
 Risks Related to Regulatory Compliance
 • As a U.S. federal government contractor, we are subject to various procurement and other laws and regulations and could be adversely affected by a failure to comply with these laws and regulations or changes in such laws and regulations.
 • The U.S. federal government may adopt new contract rules and regulations or revise its procurement practices in a manner adverse to us at any time.
 • Our business is subject to complex and evolving laws and regulations regarding data privacy and security which could subject us to investigations, claims or monetary penalties, require us to change our business practices or otherwise adversely affect our business, financial condition and results of operations.
 Risks Related to Our Indebtedness and Credit Markets
 • We have a significant amount of indebtedness (including associated covenants), which could adversely affect our financial condition or decrease our business flexibility.
 • Restrictions imposed by our indebtedness could limit our ability to operate our business and to finance our future operations or capital needs or to engage in other business activities.
 • Our credit facility includes variable rates, which subject us to interest rate risk and could cause our debt service obligations to increase and net income and cash flows to correspondingly decrease.
 Risks Related to the Transaction
 • We may not realize the anticipated financial and other benefits, including growth opportunities, expected from the Transaction.
 • If the distribution in connection with the Transaction does not qualify as a transaction that is tax-free for U.S. federal income tax purposes under Section 355 of the Internal Revenue Code, including as a result of actions taken in connection with the separation and distribution or the merger or as a result of subsequent acquisitions of shares of Jacobs or Amentum, then Jacobs and/or Jacobs' shareholders that received Amentum common stock in the distribution could be required to pay substantial U.S. federal income taxes, and, in certain circumstances, we could be obligated to indemnify Jacobs for any tax liability imposed on Jacobs arising from our actions or inactions.
 • Under the terms of the Transaction, we are restricted from taking certain actions that could adversely affect the intended tax treatment of the transactions, and such restrictions could limit our ability to implement strategic initiatives that otherwise would be beneficial.
 Risks Related to Our Common Stock
 • Amentum Equityholder owns a significant percentage of our common stock.
 • Our quarterly results may fluctuate significantly, which could have a material negative effect on the price of our common stock.
 • A significant number of shares of our common stock may be sold or otherwise disposed of, which may cause our stock price to decline.

 • Our stock price may be volatile.
 Risks Related to Climate Change
 • Climate change-related weather issues could have a material adverse impact on our, or our customers', equipment and infrastructure which could negatively impact our business, financial condition and results of operations.
 • We may be affected by market or regulatory responses to climate change.

 Risks Related to our Business and Industry
 We generate a significant portion of our revenues from contracts with the U.S. federal government. If the U.S. federal government significantly decreased or ceased doing business with us, our business, financial condition and results of operations would be materially and adversely affected.
 The U.S. federal government is our primary customer, with revenues from U.S. federal government contracts, either as a prime contractor or a subcontractor, with agencies including the DOW, U.S. Intelligence Community, NASA and the DOE. The U.S. federal government represented 81% of our revenues for the year ended October 3, 2025 ("fiscal year 2025"). We expect that U.S. federal government contracts will continue to be the primary source of our revenues for the foreseeable future. These contracts, which are a significant source of our revenue and profit, are subject to additional risks compared to contracts with private sector customers:
 • Most contracts with the U.S. federal government, and many contracts with other government entities, permit the government customer to terminate the contract at any time for the convenience of the government or for default by the contractor. Governmental agencies may modify, curtail or terminate our contracts with little or no notice at any time prior to their completion and, if we do not replace them, we may suffer a decline in revenue. In addition, for some assignments, the U.S. federal government may attempt to "insource" the services to government employees rather than outsource to a contractor.
 • Most government contracts are awarded through a rigorous competitive process, which may emphasize price over other qualitative factors. The U.S. federal government has increasingly relied upon multiple-year contracts with multiple contractors that generally require those contractors to engage in an additional competitive procurement process for each task order issued under a contract. This process may result in us facing significant additional pricing pressure and uncertainty and incurring additional costs. See Risk Factor "—We engage in a highly competitive business. If we are unable to compete effectively, we could lose market share and our business and results of operations could be negatively impacted."
 • Government contracts are subject to specific procurement regulations, which affect how we transact business with our customers and, in some instances, impose additional costs on our business operations. For example, for contracts with the U.S. federal government, we must comply with the FAR, the Truthful Cost or Pricing Data Act, the Cost Accounting Standards ("CAS"), and numerous regulations governing environmental and employment practices. Government contracts also contain terms that may expose us to heightened levels of risk and potential liability than non-government contracts.
 • Many of our U.S. federal government contracts require our employees and facilities to have security clearances, which can be difficult and time consuming to obtain. If our employees or our facilities are unable to obtain or retain the necessary security clearances, our customers could terminate or not renew existing contracts or award us new contracts, which could have a material adverse impact on our business, financial condition and results of operations. Our government contracts may also involve classified information and security restrictions, which may limit our ability to provide information about these classified programs, their risks or any disputes or claims relating to such programs. As a result, investors may have less insight into our business with respect to these programs.
 • We may not be awarded government contracts because of existing policies designed to protect small businesses and small businesses with certain socio-economic conditions. As a result, we would not be eligible to perform as a prime contractor on those programs and in general would be restricted to no more than 49% of the work as a subcontractor on those programs. An increase in the amount of procurements under the Small Business Administration set-aside programs may impact our ability to bid on new procurements as a prime contractor or restrict our ability to recompete on incumbent work that is placed in the set-aside programs.
 Negative press reports or publicity, which could pertain to employee or subcontractor misconduct, conflicts of interest, termination of a contract or task order, poor contract performance, legal violations or investigations, deficiencies in services, reports or other deliverables, information security breaches or other aspects of our business, regardless of accuracy, could harm our reputation with the U.S. federal government. Due to the sensitive nature of our work and our confidentiality obligations to our customers, we may be unable or limited in our ability to respond to such negative publicity. In addition, the mishandling or the perception of mishandling sensitive information, such as our failure to maintain the confidentiality of the existence of our

 business relationships with certain of our customers, including as a result of misconduct or other improper activities by our employees or subcontractors, or a failure to maintain adequate protection against security breaches, including those resulting from cyberattacks, could harm our relationship with U.S. federal government agencies. Our ability to hire or retain employees and our standing in professional communities, to which we contribute and receive expert knowledge, could be diminished. To the extent our performance under a contract does not meet a government agency's expectations, the customer might seek to terminate the contract prior to its scheduled expiration date, provide a negative assessment of our performance to government-maintained contractor past-performance data repositories, fail to award us additional business under existing contracts or otherwise, and direct future business to our competitors. If we were suspended or debarred from contracting with the federal government or any significant agency including the DOW, U.S. Intelligence Community, NASA and the DOE, if our reputation or relationship with government agencies was impaired, or if the government otherwise ceased doing business with us or significantly decreased the amount of business it does with us, our business, financial condition and results of operations would be materially and adversely affected.
 In addition, many of our U.S. federal government contracts contain organizational conflict of interest ("OCI") clauses that may limit our ability to compete for or perform certain other contracts or other types of services for particular customers. An OCI arises when we engage in activities that may make us unable to render impartial assistance or advice to the U.S. federal government, impair our objectivity in performing contract work or provide us with an unfair competitive advantage. Existing OCIs, and any OCIs that may develop, could preclude our competition for or performance on a significant contract, which could limit our opportunities.
 These various uncertainties, restrictions, and regulations including oversight audits by government authorities as well as profit and cost controls, could have a material adverse impact on our business, financial condition and results of operations.
 Our U.S. federal government contract work is regularly reviewed and audited by the U.S. federal government, U.S. federal government auditors and others, and these reviews can lead to withholding or delay of payments to us, non-receipt of award fees, legal actions, fines, penalties and liabilities and other remedies against us.
 U.S. federal government contracts are subject to specific laws and regulations such as the FAR, the Truthful Cost or Pricing Data Act, the CAS, the Service Contract Act and DOW security regulations. Failure to comply with any of these regulations, requirements or statutes may result in contract price adjustments, financial penalties or contract termination. Our U.S. federal government contracts are subject to audits, cost reviews and investigations by U.S. federal government contracting oversight agencies such as the Defense Contract Audit Agency ("DCAA"). The DCAA reviews the adequacy of, and our compliance with, our internal control systems and policies, including our labor, billing, accounting, purchasing, property, estimating, compensation and management information systems. The DCAA has the authority to conduct audits and reviews to determine if we are complying with the requirements under the FAR and CAS, pertaining to the allocation, period assignment and allowability of costs assigned to U.S. federal government contracts. The DCAA presents its report findings to the Defense Contract Management Agency ("DCMA"). Should the DCMA determine that we have not complied with the terms of our contract or applicable statutes and regulations, payments to us may be disallowed, which could result in retroactive adjustments to previously reported revenues and refunding of previously collected cash proceeds.
 Given the demands of working for the U.S. federal government, we may have disagreements or experience performance issues. When performance issues arise under any of our U.S. federal government contracts, the U.S. federal government retains the right to pursue remedies, which could include termination under any affected contract. If any contract were so terminated, our ability to secure future contracts could be adversely affected. Other remedies that could be sought by our U.S. federal government customers for any improper activities or performance issues include sanctions such as forfeiture of profits, suspension of payments, fines and suspensions or debarment from doing business with the U.S. federal government. Further, the negative publicity that could arise from disagreements with our customers or sanctions as a result thereof could have an adverse effect on our reputation in the industry, reduce our ability to compete for new contracts and may also have a material adverse effect on our business, financial condition and operating results.
 A delay in the completion of the federal government's budget process, a prolonged continuing resolution or government shutdown, a decline in the federal government budget, changes in spending or budgetary priorities or delays in contract awards may materially adversely affect our business, financial condition and results of operations.
 To the extent the U.S. Congress is unable to approve the annual federal budget or raise the debt ceiling on a timely basis, and enacts a continuing resolution, funding for new projects may not be available and funding on contracts we are already performing may be delayed. If Congressional efforts to approve such funding fail or if a government shutdown occurs, and Congress is unable to craft a long-term agreement on the U.S. federal government's ability to incur indebtedness in excess of its current limits, the U.S. federal government may not be able to fulfill its current funding obligations and there could be significant disruption to all discretionary programs, which would have corresponding impacts on us and our industry. Any such delays would likely result in new business initiatives being delayed or canceled and a reduction in our backlog, and could have

 a material adverse effect on our revenue, cash flow and operating results. The delay or cancellation of key programs or the delay of contract payments may have a material adverse effect on our revenue and operating results.
 Additionally, levels of U.S. federal government spending are difficult to predict and subject to significant risk. Considerable uncertainty exists regarding how future budget and program decisions will unfold, including the spending priorities of the U.S. presidential administration and Congress and what challenges budget reductions will present for us and our industry generally. Pressures on and uncertainty surrounding the U.S. federal government's budget, and potential changes in budgetary priorities and defense spending levels, could adversely affect the funding for individual programs and delay purchasing or payment decisions by our customers. Current U.S. federal government spending levels for defense-related or other programs may not be sustained, and future spending and program authorizations may not increase or may decrease or shift to programs in areas where we do not provide services or are less likely to be awarded contracts. The U.S. federal government also conducts periodic reviews of U.S. defense strategies and priorities, which may shift defense or other budgetary priorities, reduce overall U.S. federal government spending or delay contract or task order awards for defense-related or other programs from which we would otherwise expect to derive a significant portion of our future revenues. A significant decline in overall U.S. federal government spending, including the areas of national security, intelligence and homeland security, a significant shift in U.S. federal government spending priorities, the substantial reduction or elimination of particular defense-related programs or significant delays in contract or task order awards for large programs could adversely affect our business, financial condition and operating results.
 Historically, we have benefited from both domestic and international government programs that provide funding for our services. While spending and stimulus bills may provide funding in many of the markets in which we operate, we may not be able to obtain the expected benefits from these bills or similar bills in the future. In addition, the timing of funding awards under these bills is uncertain. A reduction in the amount of governmental funding available could materially affect our results of operations.
 We engage in a highly competitive business. If we are unable to compete effectively, we could lose market share and our business and results of operations could be negatively impacted.
 We face intense competition to provide engineering and technology solutions to customers. The markets we serve are highly competitive, and we compete against a large number of regional, national and multinational companies, many of whom may have greater financial resources, name recognition and a larger pool of technical staff. The extent and type of our competition varies by industry, geographic area and project type.
 Our projects are frequently awarded through a competitive procurement process, which involves risks and substantial costs, including the cost and managerial time to prepare bids and proposals for contracts that we may not be awarded or may be split among competitors, the risk of inaccurately estimating the resources required to fulfill a contract we are awarded, the difficulty of execution, cost overruns and loss of committed costs, and any opportunity cost of not bidding and winning other contracts we might have otherwise pursued. With respect to U.S. federal government customers, the procurement process may change. See Risk Factor "—The U.S. federal government may adopt new contract rules and regulations or revise its procurement practices in a manner adverse to us at any time."
 Furthermore, even after being awarded a contract, we may encounter significant delay, expense, contract modifications or even contract loss as a result of bid protests from unsuccessful bidders. It can take many months for the relevant U.S. federal government agency to resolve protests by one or more of our competitors of contract awards we receive. Bid protests may result in significant expense to us, contract modification, or loss of an awarded contract as a result of the award being overturned. Even where a bid protest does not result in a renewed competition, the resolution typically extends the time until the contract activity can begin.
 We are constantly competing for project awards based on pricing, schedule and the breadth and technical sophistication of our services. Some of our competitors have made or could make acquisitions of businesses or establish agreements among themselves or third parties, which could allow them to offer more competitive and comprehensive solutions. As a result, our competitors may be able to accelerate the adoption of new technologies that better address customer needs, expand their offerings more quickly than we do, limit our access to certain suppliers or devote more significant resources than us. Competition can place downward pressure on our contract prices and profit margins, which increases the risk that, among other things, we may not realize profit margins at the same rates as we have seen in the past or may become responsible for costs or other liabilities we have not accepted in the past. If we are unable to compete effectively, we may experience a loss of market share or reduced profitability or both, which could have a material adverse impact on our business, financial condition and results of operations.
 Our results of operations depend on the award of new contracts and the timing of the award of these contracts.
 Our revenues depend on new contract awards. Delays in the timing of the awards or cancellations of such projects as a result of economic conditions, material and equipment pricing and availability or other factors could impact our long-term projected

 results. It is particularly difficult to predict whether or when we will receive contracts for large-scale projects as these contracts frequently involve a lengthy and complex procurement and selection process, which is affected by a number of factors, such as market conditions or environmental and other governmental approvals. Since a significant portion of our revenues is generated from such projects, our results of operations and cash flows can fluctuate significantly from quarter to quarter depending on the timing of our contract awards and the commencement or progress of work under awarded contracts.
 The uncertainty of our contract award timing can also present difficulties in matching workforce size with contract needs. In some cases, we maintain and bear the cost of a ready workforce that is larger than necessary under existing contracts in anticipation of future workforce needs for expected contract awards. When an expected contract award is delayed or not received, we incur additional costs resulting from reductions in staff or redundancy of facilities, which could have a material adverse effect on our business, financial condition and results of operations.
 Continuing elevated inflation, rising or continued high interest rates, and/or costs could reduce the demand for our services as well as decrease our profit on our existing contracts, in particular with respect to our fixed-price contracts.
 Rising inflation, interest rates, and/or costs could reduce the demand for our services. In addition, we bear all of the risk of high inflation with respect to those contracts that are fixed-price. Because a significant portion of our revenues are earned from cost-plus-fee type contracts (63% for fiscal year 2025), the effects of inflation on our financial condition and results of operations over the past few years have been generally minor. Additionally, we are typically able to price fixed-price and time-and-materials ("T&M") contracts in a manner that accommodates inflation and cost increases over the period of performance. However, if we continue to experience inflationary pressures, inflation may have a larger impact on our results of operations in the future, particularly if we expand our business into markets and geographic areas where fixed-price and lump-sum work is more prevalent. Therefore, continued inflation, rising or continued high interest rates and/or construction costs could have a material adverse impact on our business, financial condition and results of operations.
 Many of our work sites are workplaces with inherent safety and environmental risks. The occurrence of an accident or safety incident involving employees, contractors or others can result in injuries, disabilities or even loss of life, which could expose us to significant financial losses and reputational harm, as well as civil and criminal liabilities.
 At work sites, our employees, contractors and others may be in close proximity with large pieces of mechanized equipment, moving vehicles, chemical and manufacturing processes and hazardous and highly regulated materials, such as nuclear and radioactive materials, in a challenging environment and often in geographically remote locations. We are responsible for safety on some of those project sites, and, accordingly, we have an obligation to comply with applicable laws, including to implement effective safety policies and procedures and to provide appropriate personal protective equipment. The failure by us or others working at such sites to comply with such laws, to implement effective safety procedures, to provide necessary equipment, to protect other contractors at work sites we manage or to conduct work in a safe manner, may result in injury, disability or loss of life, which may result in investigations, claims or litigation or result in delays in the completion or commencement of our projects. Unsafe work sites also have the potential to increase employee turnover, increase the cost of a project to our customers and raise our operating and insurance costs. In addition, releases of hazardous materials or nuclear wastes, or fires, explosions or other incidents, may result in environmental damages, or public safety concerns, and the related costs and liabilities could have a material adverse effect on our business or results of operations.
 Our safety record is critical to our reputation. Many of our customers require that we meet certain safety criteria to be eligible to bid for contracts, and our contracts may provide for automatic termination or forfeiture of some or all of our contract fees or profit in the event we fail to meet certain measures.
 For all of the foregoing reasons, if we fail to maintain adequate safety standards, we could suffer harm to our reputation, reduced profitability or the loss of projects or customers, which could have a material adverse impact on our business, financial condition and results of operations.
 The nature of our contracts, particularly any fixed-price contracts, subjects us to risks of cost overruns.
 We generate revenues under various types of contracts, which include cost-plus-fee, T&M and fixed-price contracts. Our earnings and profitability may vary materially depending on changes in the proportionate amount of revenues derived from each type of contract, the nature of services or solutions provided, as well as the achievement of performance objectives and the stage of performance at which the right to receive fees, particularly under incentive and award fee contracts, is finally determined. Cost-plus-fee and T&M contracts generally have lower profitability than fixed-price contracts. To varying degrees, each of our contract types involves some risk that we could underestimate the costs and resources necessary to fulfill the contract. Our profitability is adversely affected when we incur costs on cost-plus-fee and T&M contracts that we cannot bill to our customers. While fixed-price contracts allow us to benefit from cost savings, these contracts also increase our exposure to the risk of cost overruns. Revenues derived from fixed-price contracts represented 24% of our revenues for fiscal year 2025. Though some fixed-price contracts may anticipate moderate increases in costs over the term of the contract, cost overruns can occur, leading to reduced profits or, in some cases, a loss for that contract for a variety of reasons, including if the estimates

 prove inaccurate or if circumstances change due to, among other things, unanticipated technical problems, difficulties in obtaining permits or approvals, changes in local laws or labor conditions, weather or other delays beyond our control, changes in the costs of equipment or raw materials, our vendors' or subcontractors' inability or failure to perform, or changes in general economic conditions and inflationary pressures. We may present change orders and claims to our customers, subcontractors and vendors for, among other things, additional costs exceeding the original contract price. If we fail to properly document the nature of our claims and change orders or are otherwise unsuccessful in negotiating reasonable settlements with our customers, subcontractors and vendors, we will likely incur cost overruns, reduced profits or, in some cases, result in a loss for a project. When making proposals on fixed-price contracts, we rely heavily on our estimates of costs and timing for completing the associated projects, as well as assumptions regarding technical issues. Both fixed-price and many cost-plus-fee contracts require us to estimate the total cost of the work in advance of our performance. Fixed-price contracts are established in part on information in customer solicitations, which may be partial or incomplete; cost and scheduling estimates that are based on a number of assumptions, including those about future economic conditions, commodity and other materials pricing; and cost and availability of labor (including the cost of any related benefits or entitlements), equipment and materials and other exigencies.
 Our contracts that are fundamentally cost-plus-fee in nature may also present a risk to the extent the final cost on a contract exceeds the amount the customer expected or budgeted. In each case, our failure to accurately estimate costs or the resources and technology needed to perform our contracts or to effectively manage and control our costs during the performance of work could result, and in some instances has resulted, in reduced profits or in losses. These risks are exacerbated for projects with long-term durations because there is an increased risk that the circumstances on which we based our original estimates will change in a manner that increases costs. More generally, any increased or unexpected costs or unanticipated delays in connection with the performance of our contracts, including costs and delays caused by contractual disputes or other factors outside of our control (such as performance failures of our subcontractors, rising inflation, natural disasters or other force majeure events) could make our contracts less profitable than expected or unprofitable.
 Our failure to meet performance requirements or contractual schedules could adversely affect our business, financial condition and results of operations.
 Many of our contracts require us to satisfy specific progress or performance milestones in order to receive payment from the customer. As a result, we often incur significant costs for engineering, materials, components, equipment, labor or subcontractors prior to receipt of payment from a customer, which may impact our liquidity. In some circumstances, we may incur penalties if we do not achieve completion by a scheduled date. In some cases, the occurrence of delays may be due to factors outside of our control, such as due to supply chain shortages.
 The contracts in our backlog may be adjusted, canceled or suspended by our customers and, therefore, our backlog is not necessarily indicative of our future revenues or earnings.
 Backlog represents estimates of the total dollar amount of revenues we expect to record in the future as a result of performing work under contracts that have been awarded to us. As of October 3, 2025, backlog was $47.1 billion. The backlog may not be realized as revenues in the amounts reported or if realized will result in profits. In accordance with industry practice, substantially all of our contracts, including our U.S. federal government contracts, are subject to cancellation, termination, or suspension at the discretion of the customer, and may be subject to changes in the scope of services to be provided, as well as adjustments to the costs relating to the contracts, and may be subject to other contingencies such as congressional appropriations. The maximum contract value specified under a government contract or task order awarded to us is not necessarily indicative of the revenues that we will realize under that contract. For example, many government contracts are made with multiple providers, meaning that the government could turn to other companies to fulfill the contract. Action by the government to obtain support from other contractors or failure by the government to order the quantity of work anticipated could reduce revenues realized under a particular contract. Our unfunded backlog contains management's estimate of amounts expected to be realized on unfunded contract work that may never be realized as revenues. In the event of a contract cancellation, we would generally have no contractual right to the revenue reflected in our backlog. Contracts can remain in backlog for extended periods of time because of the nature of the project and the timing of the particular services required by the contract. The risk of contracts in backlog being canceled or suspended generally increases during periods of widespread economic slowdowns or in response to changes in commodity prices.
 In some markets, there is a continuing trend toward cost-plus-fee contracts with incentive-fee arrangements. Typically, our incentive fees are based on such things as achievement of target completion dates or target costs, overall safety performance, overall customer satisfaction and other performance criteria. If we fail to meet such targets or achieve the expected performance standards, we may receive a lower, or even zero, incentive fee, resulting in lower gross margins. Accordingly, the contracts in backlog, assuming they produce the revenues currently expected, may not generate gross margins at the rates we have realized in the past.
 The provision of our services may expose us to significant monetary damages or even criminal violations in the event of liabilities resulting from our activities, including noncompliance with regulatory requirements, and our insurance policies

 may not provide adequate coverage, which could have a material adverse impact on our business, financial condition, and results of operations and damage our reputation.
 We provide services that are subject to professional standards and qualifications, including providing services that are based on our professional engineering expertise, as well as our other professional credentials. These services must comply with various professional standards, duties and obligations regulating the performance of such services. Our business, for example, may involve professional judgments regarding the planning, design, development, construction, operations and management of government and industrial facilities. While we do not generally accept liability for consequential damages in our contracts, and although we have adopted a range of insurance, risk management and risk avoidance programs designed to reduce potential liabilities, we may be deemed to be responsible for these professional judgments, recommendations or opinions if they are later determined to be inaccurate, or if a catastrophic event or other failure occurs at one of our work sites. Any unfavorable legal ruling against us could result in substantial monetary damages, disqualification to perform services in the future, or even criminal violations.
 Such events could result in significant professional liability and warranty or other claims against us that could be highly publicized and have reputational harm, especially if public safety is impacted. We could also be liable to third parties, including through class actions, even if we are not contractually bound to those third parties. These liabilities could exceed our insurance limits or the fees we generate, may not be covered by insurance at all due to various exclusions in our coverage and could impact our ability to obtain insurance in the future. Further, even where coverage applies, the policies have limits and deductibles or retentions, which could result in our assumption of exposure for certain amounts with respect to any claim filed against us. In addition, indemnification from customers or subcontractors may not be available. An uninsured claim, either in part or in whole, as well as any claim covered by insurance but subject to a policy limit, high deductible and/or retention, if successful and of a material magnitude, could have a material adverse impact on our business, financial condition and results of operations.
 We are a party to claims and litigation in the normal course of business, including litigation inherited through acquisitions. Our business operations can result in substantial injury or damage to employees or others, and expose us to substantial claims and litigation and investigations relating to, among other things, personal injury, loss of life, business interruption, property damage, or pollution and environmental damage. We can also be exposed to claims if we agreed that our work will achieve certain performance standards or satisfy certain technical requirements and those standards or requirements are not met. In many of our contracts with customers, subcontractors and vendors, we agree to retain or assume potential liabilities for damages, penalties, losses and other exposures relating to projects that could result in claims that greatly exceed the anticipated profits relating to those contracts. In addition, while customers and subcontractors may agree to indemnify us against certain liabilities, such third parties may refuse or be unable to pay us.
 With a workforce of approximately 50,000 people globally, we are also party to labor and employment claims in the normal course of business. Certain of these claims relate to allegations of harassment and discrimination, pay equity, denial of benefits, wage and hour violations, whistleblower protections, concerted protected activity, and other employment protections, and may be pursued on an individual or class action basis depending on applicable laws and regulations. Some of such claims may be insurable, while other such claims may not.
 In addition, claims received from subcontractors or made by us for change orders can be the subject of lengthy negotiations, arbitration or litigation proceedings, which could result in the investment of significant amounts of working capital pending the resolution of the relevant change orders and claims. A failure to promptly recover on these types of claims could have a material adverse impact on our liquidity and financial results. Additionally, irrespective of how well we document the nature of our claims and change orders, the cost to prosecute and defend claims and change orders can be significant.
 Litigation and regulatory proceedings are subject to inherent uncertainties and unfavorable rulings can and do occur. Pending or future claims against us could result in professional liability, product liability, criminal liability, warranty obligations, default under our credit agreement and other liabilities which, to the extent we are not insured against a loss or our insurer fails to provide coverage, could have a material adverse impact on our business, financial condition, and results of operations and damage our reputation.
 Employee, agent or partner misconduct, or our overall failure to comply with laws or regulations, could weaken our ability to win contracts, which could result in reduced revenues and profits.
 We are subject to the risk of misconduct, fraud, non-compliance with applicable laws and regulations, or other improper activities by our employees, agents or partners, which could have a significant negative impact on our business and reputation. Such misconduct includes the failure to comply with government procurement regulations, regulations regarding the protection of classified information, regulations prohibiting bribery and other corrupt practices, regulations regarding the pricing of labor and other costs in government contracts, regulations on lobbying or similar activities, regulations pertaining to the internal controls over financial reporting, regulations pertaining to export control, environmental laws, employee wages, pay and benefits, and any other applicable laws or regulations. For example, we routinely provide services that may be highly sensitive

 or that relate to critical national security matters; if a security breach were to occur, our ability to receive future government contracts could be severely limited. The precautions we take to prevent and detect these activities may not be effective and we could face unknown risks or losses. Our failure to comply with applicable laws or regulations, or acts of misconduct subjects us to the risk of fines and penalties, cancellation of contracts, loss of security clearance and suspension or debarment from contracting, any of which could damage our reputation, weaken our ability to win contracts and result in reduced revenues and profits and could have a material adverse impact on our business, financial condition and results of operations. See "Risks Related to Regulatory Compliance".
 Cybersecurity or privacy breaches, or systems and information technology interruption or failure could adversely impact our ability to operate or expose us to significant financial losses and reputational harm.
 We are subject to certain risks related to interruptions, errors and delays in our information technology systems. In the event we are unable to maintain or improve the efficiency and efficacy of our systems, the operation of such systems could result in the material loss, corruption, or release of data. Further, a significant percentage of our employees continue to work under remote or hybrid working arrangements, which may pose additional data security risks. These risks will continue as we continue to operate both remote and hybrid arrangements for employees. If we experience compromises to security that result in performance or availability problems, our customers may lose trust and confidence in us. In addition, our computer and communication systems and operations could be damaged or interrupted by natural disasters, force majeure events, telecommunications failures, power loss, acts of war or terrorism, computer viruses, malicious code, physical or electronic security breaches, intentional or inadvertent user misuse or error or similar events or disruptions. Any of these or other events could have a material adverse impact on our business, financial condition, protection of personal data and intellectual property and results of operations, as well as those of our customers.
 As a government contractor and a provider of information technology services operating in multiple regulated industries and geographies, we and our service providers, suppliers and subcontractors collect, store, transmit and otherwise process personal, confidential, proprietary and sensitive information, including classified information. As a result, our information technology systems, including those provided by third-party cloud providers or other infrastructure-as-a-service providers, which have grown over time, including through acquisitions, have, and will continue to experience threats, including unauthorized access, computer hackers, computer viruses, malicious code, ransomware, phishing, organized cyber-attacks and other security problems and system disruptions, including unauthorized access to and disclosure of our and our customers' proprietary, classified or other protected information. Such threats have caused, and may also seek to cause in the future, payments due to or from us to be misdirected to fraudulent accounts, which may not be recoverable by us.
 While we have security measures and technology in place designed to protect our and our customers' proprietary, classified and other protected information, there can be no assurance that our efforts will prevent all threats to our computer systems. Military action and conflicts and geopolitical shifts raise concerns about a potential increase in cyber-attacks generally as a result of the military conflict, including as between Russia and Ukraine, and related sanctions imposed by the United States and other countries. In addition, the rapid evolution and increased adoption of artificial intelligence technologies may intensify our cybersecurity risks. Because the techniques used to obtain unauthorized access or sabotage systems change frequently, become more sophisticated and generally are not identified until they are launched against a target, we may be unable to anticipate these techniques or to implement adequate preventative measures. As a result, we may be required to expend significant resources to protect against the threat of system disruptions and security breaches or to alleviate problems caused by these disruptions and breaches. Any of these events could damage our reputation, cause us to incur significant liability and have a material adverse effect on our business, financial condition and results of operations.
 For additional information on the regulatory requirements governing data privacy and security, see "Risks Related to Regulatory Compliance—Our business is subject to complex and evolving laws and regulations regarding data privacy and security which could subject us to investigations, claims or monetary penalties against us, require us to change our business practices or otherwise adversely affect our business, financial condition and results of operations."
 If we do not have adequate indemnification for our nuclear services, or business is slowed by the extensive regulatory processes for approval and licensing for new and existing nuclear technologies or socio-political opposition to nuclear-related technology and activities, it could adversely affect our business, financial condition and results of operations.
 The Price-Anderson Nuclear Industries Indemnity Act, commonly called the Price-Anderson Act ("PAA"), is a U.S. federal law, which, among other things, regulates radioactive materials and the nuclear energy industry, including liability and compensation in the event of nuclear related incidents. The PAA provides certain protections and indemnification to nuclear energy plant operators and DOE contractors. The PAA protections and indemnification apply to us as part of our services to the U.S. nuclear energy industry and DOE for new facilities, maintenance, modification, decontamination and decommissioning of nuclear energy, weapons and research facilities.
 We offer similar services in other jurisdictions outside the U.S. For those jurisdictions, varying levels of nuclear liability protection is provided by international treaties, and/or domestic laws, such as the Nuclear Liability and Compensation Act of

 Canada and the Nuclear Installations Act of the United Kingdom, insurance and/or assets of the nuclear installation operators (some of which are backed by governments) as well as under appropriate enforceable contractual indemnifications and hold-harmless provisions. These protections and indemnifications, however, may not cover all of our liabilities that could arise in our performance of these services. To the extent the PAA or other protections and indemnifications do not apply to our services, the cost of losses associated with liability not covered by the available protections and indemnifications, or by virtue of our loss of business because of these added costs could have a material adverse impact on our business, financial condition and results of operations.
 In addition, certain of our contracts provide a wide range of nuclear services to the U.S. and U.K. governments. If the policies of those governments were to de-emphasize nuclear matters, it may have a material adverse impact on our business, financial condition and results of operations.
 Uncertainty over global tariffs, or the financial impact of tariffs, may negatively impact our results.
 Our business could be adversely impacted by changes in the U.S. Government's approach to tariffs and other trade policies. As a result of major U.S. Government trade policy changes announced by President Trump, there is currently significant uncertainty with respect to tariffs that may impact our supply chain. New or increased tariffs for imports into the United States, as well as new or increased tariffs or trade bans imposed by other countries, could have an adverse effect on both our U.S. and international operations due to increased costs of materials, disruptions or delays in deliveries, and greater difficulty in planning and operating our business. While our business in the U.S. primarily provides labor services to our customers, some of our U.S. work involves providing goods that may be subject to tariffs. Our non-U.S. work could also be impacted by greater costs for goods sourced from the U.S. due to increased tariffs imposed by other countries. To date, the Company has not experienced a material negative impact from the recent changes in tariff policies. Although we plan to continue to monitor trade policy developments closely and to mitigate the adverse impacts of any changes where possible, we may not be able to fully mitigate such impacts in all situations.

 Risks Related to International Operations
 Our international operations are exposed to additional risks and uncertainties, including unfavorable political developments and weak foreign economies.
 Our business is dependent on the continued success of our international operations, and we expect our international operations to continue to account for a significant portion of our revenues. Our international operations are subject to a variety of risks, including:
 • recessions and other economic crises in other regions, such as Europe, Asia or other specific foreign economies and the impact on our costs of doing business in those countries;
 • recent geopolitical tensions and conflict between the U.S. government and certain South and Central American countries;
 • difficulties in staffing and managing foreign personnel and operations, including challenges related to logistics, communications and professional licensure of our international workforce;
 • unexpected changes in foreign government policies and regulatory requirements;
 • potential non-compliance with a wide variety of laws and regulations, including anti-corruption, export control and anti-boycott laws and similar non-U.S. laws and regulations;
 • potential non-compliance with regulations and evolving industry standards regarding consumer protection and data use and security, including the GDPR approved by the European Union and the Data Protection Act approved by the United Kingdom;
 • lack of developed legal systems to enforce contractual or intellectual property rights;
 • expropriation and nationalization of our assets in a foreign country;
 • renegotiation or nullification of our existing contracts;
 • the adoption of new, and the expansion of existing, trade or other restrictions;
 • embargoes, duties, tariffs or other trade restrictions, including sanctions;
 • geopolitical developments that impact our or our customers' ability to operate in a foreign country;
 • changes in labor conditions;
 • acts of war, aggression between nations, civil unrest, force majeure, and terrorism;

 • the ability to finance efficiently our foreign operations;
 • social, political, and economic instability;
 • changes to tax policy;
 • currency exchange rate fluctuations;
 • limitations on the ability to repatriate foreign earnings; and
 • U.S. federal government policy changes in relation to the foreign countries in which we operate.
 The lack of a well-developed legal system in some of these countries may make it difficult to enforce our contractual rights. In addition, military action, geopolitical shifts or continued unrest, particularly in the Middle East, could disrupt our operations in the region and elsewhere and may also impact the supply or pricing of oil, increase our security costs and cost of compliance with local laws, and present risks to our reputation. Additionally, recent events, including changes in U.S. trade policies and responsive changes in policy by foreign jurisdictions and similar geopolitical developments and uncertainty in the E.U., Asia and elsewhere, have increased levels of political and economic unpredictability globally, and may increase the volatility of global financial markets and the global and regional economies.
 To the extent our international operations are affected by unexpected or adverse economic, political and other conditions, our business, financial condition and results of operations may be adversely affected.
 Changes in domestic and foreign governmental laws, regulations and policies, changes in statutory tax rates and laws, and unanticipated outcomes with respect to tax audits could adversely affect our business, profitability and reputation.
 Our domestic and international sales and operations are subject to risks associated with changes in laws, regulations and policies (including changes in the FAR, export/import laws, tax policies, environmental and employment requirements and other similar legal requirements). Failure to comply with any of the foregoing laws, regulations and policies could result in civil and criminal, monetary and non-monetary penalties, as well as damage to our reputation. In addition, our costs of complying with new and evolving regulatory reporting requirements and current or future laws, including environmental, employment, data security, data privacy, health and safety, environmental, and employment laws may exceed our estimates. While these risks or the impact of these risks are difficult to predict, any one or more of them could adversely affect our business, results of operations and reputation.
 We are subject to taxation in a number of jurisdictions. Accordingly, our effective tax rate is impacted by changes in the mix among earnings in countries with differing statutory tax rates. A material change in the statutory tax rate or interpretation of local law in a jurisdiction in which we have significant operations could adversely impact our effective tax rate and impact our financial results.
 Our tax returns are subject to audit and taxing authorities could challenge our operating structure, taxable presence, application of treaty benefits or transfer pricing policies. If changes in statutory tax rates or laws or audits result in assessments different from amounts estimated, our business, results of operations and financial condition could be adversely affected. In addition, changes in tax laws could have an adverse effect on our customers, resulting in lower demand for our products and services.
 We work in international locations where there are high security risks, which could result in harm to our employees or unanticipated costs.
 Some of our services are performed in high-risk locations, including for example Iraq, where the country or location is subject to political, social or economic risks, or war, terrorism or civil unrest. In those locations where we have employees or operations, we may expend significant efforts and incur substantial security costs to maintain the security of our personnel. Despite these activities, in these locations, we cannot always guarantee the security of our personnel. Acts of terrorism, threats of armed conflicts and human rights violations in or around various areas in which we operate could limit or disrupt markets and our operations, including disruptions resulting from the evacuation of personnel or the cancellation of contracts, and in some instances, cause damage to our reputation. The loss of key employees or contractors, whether as a result of injury, death or attrition, may adversely impact our business operations.

 Risks Related to Acquisitions, Investments, Joint Ventures and Divestitures
 Our use of joint ventures, partnerships and strategic investments in entities exposes us to risks and uncertainties, many of which are outside of our control.
 As is common in our industry, we perform certain contracts as a member of joint ventures, partnerships, and similar arrangements. This situation exposes us to a number of risks, including the risks that our partners may be unable to fulfill their obligations to us or our customers and that our reputation may be negatively affected due to the actions of our joint venture or other partners.

 Further, we have limited ability to control the actions of our joint venture partners, including with respect to nonperformance, default, bankruptcy or legal or regulatory compliance. Our partners may be unable or unwilling to provide the required levels of financial support to the partnerships. If these circumstances occur, we may be liable for claims and losses attributable to the partner by operation of law or contract. These circumstances could also lead to disputes and litigation with our partners or customers, all of which could have a material adverse impact on our reputation, business, financial condition and results of operations.
 We depend on the management effectiveness of our joint venture partners. Differences in views among the joint venture participants may result in delayed decisions or in failures to agree on major issues, which could materially affect the business and operations of these ventures. In addition, in many of the countries in which we engage in joint ventures, it may be difficult to enforce our contractual rights under the applicable joint venture agreement. If we are not able to enforce our contractual rights, we may not be able to realize the benefits of the joint venture or we may be subject to additional liabilities.
 We participate in joint ventures and similar arrangements in which we are not the controlling partner. In these cases, we have limited control over the actions of the joint venture. These joint ventures may not be subject to the same requirements regarding internal controls and internal control over financial reporting that we follow. To the extent the controlling partner makes decisions that negatively impact the joint venture or internal control problems arise within the joint venture, it could have a material adverse impact on our business, financial condition and results of operations.
 The failure by a joint venture partner to comply with applicable laws, regulations or customer requirements could negatively impact our business and, for government customers, could result in fines, penalties, suspension or even debarment being imposed on us, which could have a material adverse impact on our business, financial condition and results of operations.
 An impairment charge on our goodwill or intangible assets could have a material adverse impact on our financial position and results of operations.
 Because we have grown in part through acquisitions, goodwill and intangible assets represent a substantial portion of our assets. As of October 3, 2025, we have $5.7 billion of goodwill, representing 49.8% of the total assets of $11.5 billion. Under U.S. GAAP, we are required to test goodwill carried in our Consolidated Balance Sheets for possible impairment on an annual basis, and whenever events occur, or circumstances change, that indicate impairments could exist and that the carrying value of such goodwill may not be recoverable, based upon a fair value approach. These impairment tests are based on several factors requiring judgment. We also assess the recoverability of the unamortized balance of our intangible assets when indications of impairment are present based on expected future probability and undiscounted expected cash flows and their contribution to our overall operations. We evaluate goodwill for impairment annually on the first day of the fourth quarter of the fiscal year or whenever events or circumstances indicate that the carrying value may not be recoverable.
 If our market capitalization drops significantly below the amount of net equity recorded on our balance sheet, it might indicate a decline in our fair value and would require us to further evaluate whether our goodwill has been impaired. If the fair value of our reporting units is less than their carrying value, we could be required to record an impairment charge. The amount of any impairment could be significant and could have a material adverse impact on our financial position and results of operations for the period in which the charge is taken. For a further discussion of goodwill impairment testing, please see the section entitled "Management's Discussion and Analysis of Financial Condition and Results of Operations".
 Our business strategy relies in part on acquisitions and strategic investments to sustain our growth, as well as targeted divestitures. These transactions present certain risks and uncertainties.
 Our business strategy involves growth through, among other things, the acquisition of, and strategic investments in, other companies. We also engage in portfolio shaping through divestitures. These transactions, as well as transactions we may engage in in the future, present a number of risks, including:
 • assumption of liabilities of an acquired business, including liabilities that were unknown at the time the transactions were negotiated, such as if the target company failed to comply with U.S. federal, state, local and foreign laws and regulations and/or contractual requirements with government customers;
 • valuation methodologies may not accurately capture the value of the target company's business;
 • failure to realize anticipated benefits, such as cost savings, synergies, business opportunities and growth opportunities within the anticipated time-frame or at all;
 • the loss of key customers or suppliers, including as a result of any actual or perceived conflicts of interest;
 • difficulties or delays in obtaining regulatory approvals, licenses and permits;
 • the effects of diverting leadership's attention from day-to-day operations to matters involving the integration of target companies;

 • potentially substantial transaction costs associated with business combinations, strategic investments and/or divestitures;
 • potential impairment resulting from the overpayment for an acquisition or investment or post-closing deterioration in the target company's business;
 • difficulties relating to assimilating the leadership, personnel, benefits, services, and systems of an acquired business and to assimilating marketing and other operational capabilities;
 • increased financial and accounting challenges and complexities in areas such as tax planning, treasury management, financial and non-financial reporting and internal controls;
 • risk that we are not able to complete strategic divestitures on satisfactory terms and conditions, including non-competition arrangements applicable to certain of our business lines, or within expected timeframes;
 • risks that indemnification related to businesses divested or spun off that we may be required to provide or otherwise bear may be significant and could negatively impact our business; and
 • the potential for claims for damages by the sellers of any business if we enter into an acquisition agreement that we do not ultimately consummate, or if disputes with sellers or buyers arise post-closing relating to post-closing covenants or payment obligations.
 While we may obtain indemnification rights from the sellers of acquired businesses and/or insurance that could mitigate certain of these risks, such rights may be difficult to enforce, the losses may exceed any dedicated escrow funds and the indemnitors may not have the ability to financially support the indemnity, or the insurance coverage may be unavailable or insufficient to cover all losses.
 If our leadership is unable to successfully integrate acquired companies or implement our growth strategy with respect to acquisitions and/or strategic investments, our operating results could be harmed. Moreover, we may not continue to successfully expand or the growth or expansion may not result in profitability.
 In addition, we may not locate suitable acquisition or investment targets or may not be able to consummate any such transactions on terms and conditions acceptable to us. Existing cash balances and cash flows from operations, together with borrowing capacity under our senior secured credit facility, may be insufficient to make acquisitions and/or strategic investments. Future acquisitions and/or strategic investments may require us to obtain additional equity or debt financing, which may not be available on attractive terms, or at all. Acquisitions and/or strategic investments may also bring us into businesses we have not previously conducted and expose us to additional business risks that are different than those we have traditionally experienced.

 Risks Related to Regulatory Compliance
 As a U.S. federal government contractor, we are subject to various procurement and other laws and regulations and could be adversely affected by a failure to comply with these laws and regulations or changes in such laws and regulations.
 U.S. federal government contractors must comply with many significant procurement regulations and other specific legal requirements. These regulations and requirements, although customary in U.S. federal government contracting, increase our performance and compliance costs and are regularly evolving. We are subject to and expected to perform in compliance with a vast array of federal and state civil and criminal laws, including, but not limited to:
 • the Truthful Cost or Pricing Data requirements (commonly referred to as the Truth in Negotiations Act);
 • the Procurement Integrity Act;
 • the Anti-Kickback Act;
 • the Cost Accounting Standards;
 • the FAR and agency FAR supplements;
 • the International Traffic in Arms Regulations promulgated under the Arms Export Control Act;
 • the Close the Contractor Fraud Loophole Act;
 • the Foreign Corrupt Practices Act ("FCPA");
 • the Service Contract Act;
 • the Davis-Bacon Act;
 • immigration laws and regulations;

 • tax laws and regulations;
 • import-export controls and trade restrictions; and
 • federal and state employment laws and regulations (including equal opportunity and affirmative action requirements).
 For example, our global operations require importing and exporting goods and technology across international borders which requires compliance with both export regulatory laws and International Trafficking in Arms Regulations ("ITAR"). Although we have policies and procedures to comply with U.S. and foreign international trade laws, the violation of such laws could subject us and our employees to civil or criminal penalties, including substantial monetary fines, or other adverse actions including denial of import or export privileges or debarment from participation in U.S. federal government contracts, and could damage our reputation and our ability to do business. Similarly, the companies we acquire may have issues with regulatory compliance and the integration of those companies may present challenges, which could risk violations of governmental requirements.
 Additionally, we are subject to the False Claims Act (the "FCA"), which provides for substantial damages and penalties where, for example, a contractor presents a false or fraudulent claim to the government for payment or approval. Actions under the FCA may be brought by the government or by individuals (including employees or former employees) on behalf of the government (who may then share a portion of any recovery). If we fail to comply with these laws and regulations, we may also suffer harm to our reputation, which could impair our ability to win awards of contracts in the future or receive renewals of existing contracts. If we are subject to civil and criminal penalties and administrative sanctions or suffer harm to our reputation, our business, financial condition and results of operations could be materially and adversely affected. We are currently, and may, from time to time, be subject to government investigation or litigation brought by or on behalf of the government under the FCA. Because of the inherent uncertainties of litigation, we are unable to predict the outcome of these proceedings, though we believe that the resolution of these matters will not have a material effect on our results of operations. However, we may be subject to additional FCA litigation, which could include claims for treble damages, and these suits may remain under seal (and hence, be unknown to us) for some time while the U.S. federal government decides whether to intervene on behalf of the plaintiff.
 Under our U.S. federal government contracts, we are required to report significant overpayments we receive from the U.S. federal government and other specified violations to the relevant agency inspector general. In addition, compliance with procurement laws and regulations, as well as performance under the terms of government contracts and subcontracts, is periodically reviewed by U.S. federal government agencies. We and many of our customers operate in highly regulated environments, which requires us or our customers to obtain, and to comply with, federal, state and local government permits and approvals. These permits or approvals are subject to denial, revocation or modification under various circumstances. Failure to obtain or comply with, or the loss or modification of, the conditions of permits or approvals subjects us to the risk of penalties or other liabilities, could have a material adverse impact on our business, financial condition and result of operations.
 If we are found to have violated the law, or are found not to have acted responsibly as defined by the law, we may be subject to civil and criminal penalties and administrative sanctions, including termination of contracts, forfeiture of profits, suspension of payments, fines and suspension or prohibition from doing business with the U.S. federal government, any of which could have an adverse effect on its financial position, results of operations and/or cash flows.
 Compliance with diverse and changing legal requirements is costly, time-consuming and requires significant resources. We conduct business in certain identified growth areas, such as national security and national intelligence, that are highly regulated and may expose us to increased compliance risk. New laws, regulations, or procurement requirements, or changes to current laws and regulations and requirements (including, for example, changes in the FAR, regulations relating to allowability of compensation costs, counterfeit parts, specialty metals and conflict minerals), can increase our costs and risks and reduce our profitability. U.S. federal government contract violations could result in the imposition of civil and criminal penalties and administrative sanctions, including termination of contracts, forfeiture of profits, suspension of payments, fines and suspension or prohibition from doing business with the U.S. federal government. We could also suffer serious harm to our reputation. Any interruption or termination of our ability to bid on U.S. federal government contracts could materially and adversely affect our business, financial condition and results of operations.
 In addition, we are subject to various additional international procurement and other laws and regulations, including the United Kingdom Bribery Act, with similar impacts to us for failure to comply.
 The U.S. federal government may adopt new contract rules and regulations or revise its procurement practices in a manner adverse to us at any time.
 Our industry continues to experience significant changes to business practices as a result of an increased focus on affordability, efficiencies and recovery of costs, among other items. U.S. federal government agencies may face restrictions or pressure regarding the type and amount of services that they may obtain from private contractors. Legislation, regulations and initiatives dealing with procurement reform, including changes in the FAR, deterrence of fraud, and stricter environmental compliance or

 sustainability requirements could have an adverse effect on us. Moreover, shifts in the buying practices of U.S. federal government agencies (such as increased usage of fixed-price contracts and multiple award contracts) could have adverse effects on government contractors, including us. Any of these changes could impair our ability to obtain new contracts or contract renewals. Any new contracting requirements or procurement methods could be costly or administratively difficult for us to implement and could adversely affect our business, financial condition and results of operations.
 Our business is subject to complex and evolving laws and regulations regarding data privacy and security which could subject us to investigations, claims or monetary penalties, require us to change our business practices or otherwise adversely affect our business, financial condition and results of operations.
 We are subject to a variety of laws and regulations in the U.S., at the federal, state and local levels and abroad, such as the General Data Protection Regulation in the European Union, relating to data privacy and security. These laws and regulations are complex, constantly evolving, and may be subject to significant change in the future. In addition, the application, interpretation and enforcement of these laws and regulations are often uncertain, particularly in new and rapidly evolving areas of technology, and may differ in material respects among jurisdictions, interpreted and applied inconsistently among jurisdictions or in a manner that is inconsistent with our current policies and practices, all of which can make compliance challenging and costly, and expose us to related risks and liabilities.
 As a contractor supporting defense and national security customers, we are also subject to certain additional, specific regulatory compliance requirements relating to data privacy and security. Under the Defense Federal Acquisition Regulation Supplement and other federal regulations, we are required to implement the security and privacy controls in National Institute of Standards and Technology Special Publications on certain of our networks and information technology systems. To the extent that we do not comply with applicable security and control requirements, and there is unauthorized access to or disclosure of sensitive information (including personal information), this could potentially result in a contract termination or information security issues, which could materially and adversely affect our business and financial results and lead to reputational harm. We will be subject to the DOW Cybersecurity Maturity Model Certification ("CMMC") requirements, which will require contractors that process, store, or transmit critical national security information on their information technology systems to receive specific third-party certifications relating to specified cybersecurity standards to be eligible for contract awards. In addition, our subcontractors, and in some cases our vendors, also may be required to adhere to the CMMC program requirements and, potentially, to achieve certification. Should our supply chain fail to meet compliance requirements or achieve certification, this may adversely affect our ability to receive awards or execute on relevant government programs. We are in the process of evaluating our readiness and preparing for the CMMC requirements, but to the extent we are unable to achieve certification in advance of contract awards that specify the requirement in the future, we will be unable to bid on such contract awards or follow-on awards for existing work with the DOW, depending on the level of standard as required for each solicitation, which could adversely impact our business, financial condition and results of operations. In addition, any obligations that may be imposed on us under the CMMC program may be different from or in addition to those otherwise required by applicable laws and regulations, which may cause additional expense for compliance.
 The overarching complexity of data privacy and security laws and regulations around the world poses a compliance challenge that could manifest in costs, damages or liability in other forms as a result of failure to implement proper programmatic controls, failure to adhere to those controls, or the breach of applicable data privacy and security requirements by us, our employees, our business partners (including our service providers, suppliers or subcontractors) or our customers. We also expect that there will continue to be new proposed laws, regulations and industry standards concerning data privacy and security, and we cannot yet determine the impact such future laws, regulations and standards, or amendments to or re-interpretations of existing laws, regulations or standards, may have on our business. Any failure or perceived failure by us, our service providers, suppliers, subcontractors or other business partners to comply with applicable laws, regulations, our public privacy policies and other public statements about data privacy and security and other obligations in these areas could result in regulatory or government actions lawsuits against us (including civil claims, such as representative actions and other class action-type litigation), legal liability, monetary penalties, fines, sanctions, damages and other costs, orders to cease or change our processing of data, changes to our business practices, diversion of internal resources, and harm to our reputation, all of which could adversely affect our business, financial condition and results of operations. We may also incur substantial expenses in implementing and maintaining compliance with such laws, regulations and other obligations.
 Increasing scrutiny and changing and conflicting expectations from governmental organizations, customers, and our employees with respect to our sustainability practices may impose additional costs on us or expose us to new or additional risks.
 There is increased scrutiny from governmental organizations, customers, and employees on companies' sustainability practices and disclosures. If our sustainability practices do not meet evolving rules and regulations or stakeholder expectations and standards (or if we are viewed negatively based on positions we do or do not take or work we do or do not perform or cannot publicly disclose for certain customers and industries), then our reputation, our ability to attract or retain leading experts, employees and other professionals and our ability to attract new business and customers could be negatively impacted, as could

 our attractiveness as an investment, service provider, employer, or business partner. Similarly, any failure or perceived failure in our efforts to execute our sustainability strategy, to achieve our current or future related goals, targets, and objectives, or to satisfy various reporting standards within the timelines expected by stakeholders or at all, could also result in similar negative impacts. Organizations that provide information to investors on corporate governance and related matters have developed rating processes for evaluating companies on their approach to sustainability matters, and unfavorable ratings of our sustainability efforts may lead to negative investor sentiment, diversion of investment to other companies, and difficulty in hiring skilled employees. In addition, complying or failing to comply with existing or future federal, state, local, and foreign legislation and regulations applicable to our sustainability efforts, which may conflict with one another, could cause us to incur additional compliance and operational costs or actions and suffer reputational harm, which could materially and adversely affect our business, financial condition and results of operations.

 Risks Related to Our Indebtedness and Credit Markets
 We have a significant amount of indebtedness (including associated covenants), which could adversely affect our financial condition or decrease our business flexibility.
 The Credit Facility consists of our term facility maturing on September 27, 2031 and our revolving facility maturing on September 27, 2029. In August 2024, the Company also completed an offering of $1,000 million in aggregate principal amount of 7.250% senior notes due August 1, 2032.
 Our level of indebtedness could have important consequences, including, but not limited to:
 • reducing our flexibility to respond to changing business and economic conditions, and increasing our vulnerability to general adverse economic and industry conditions;
 • requiring us to dedicate a substantial portion of our cash flows from operations to make debt service payments, thereby reducing the availability of cash flows to fund working capital, capital expenditures, dividends, share repurchases, acquisitions and investments and other general corporate purposes;
 • limiting our flexibility in planning for, or reacting to, challenges and opportunities, and changes in our businesses and the markets in which we operate;
 • limiting our ability to obtain additional financing to fund our working capital, capital expenditures, dividends, acquisitions and debt service requirements and other financing needs;
 • increasing our vulnerability to increases in interest rates in general because a substantial portion of our indebtedness is bears interest at floating rates; and
 • placing us at a competitive disadvantage to our competitors that have less debt.
 Each financial institution that is part of the syndicate for the revolving facility is responsible on a several, and not joint, basis for providing a portion of the loans to be made under the revolving facility. If any financial institution or group of financial institutions with a significant portion of the commitments in the revolving facility fails to satisfy its or their respective obligations to extend credit under the revolving facility and we are unable to find a replacement for such participant or participants on a timely basis (if at all), our liquidity and results of operations may be adversely affected.
 Our ability to service our indebtedness will depend on our future operating performance and financial results, which will be subject, in part, to factors beyond our control, including interest rates and general economic, financial and business conditions. If we do not have sufficient cash flow to service our indebtedness, we may need to refinance all or part of our indebtedness, borrow more money or sell securities or assets, some or all of which may not be available to us at acceptable terms or at all. In addition, we may need to incur additional indebtedness in the future. Although the terms of our indebtedness allow us to incur additional indebtedness, this would be subject to certain limitations which may preclude us from incurring the amount of indebtedness we otherwise desire.
 Restrictions imposed by our senior credit facility limit our ability to operate the business and to finance our future operations or capital needs or to engage in other business activities.
 The terms of the senior secured credit facility restrict us from engaging in specified types of transactions. For example, these restrictions include covenants limiting the ability of Amentum and its restricted subsidiaries, among other things, to:
 • incur or guarantee additional indebtedness;
 • create or incur liens;
 • pay dividends on capital stock or redeem, repurchase or retire capital stock, warrants or indebtedness, as applicable;
 • enter burdensome agreements restricting non-loan parties;

 • make investments, loans, advances and acquisitions;
 • sell assets, including capital stock of subsidiaries;
 • consolidate or merge;
 • engage in sale and lease-back transactions;
 • engage in transactions with our affiliates; and
 • amend our organizational documents, change its fiscal year or engage in different, material lines of business.
 In addition, the revolving credit facility under the first lien credit agreement contains a financial maintenance covenant. Our ability to comply with these restrictions may be affected by events beyond our control, and we may not be able to maintain compliance with them. A breach of this covenant or any of the covenants described above could result in an event of default.
 If an event of default occurs under the senior secured credit facility, the relevant lenders could elect to declare all amounts outstanding under the credit facility to be immediately due and payable and/or exercise their rights under the related security documents. If the indebtedness under the credit facility was to be accelerated, our assets may not be sufficient to repay such indebtedness in full. Any acceleration of amounts due under the credit facility or the substantial exercise by the relevant lenders of their rights under the security documents would have a material adverse effect on Amentum. In addition, an event of default under the credit facility may also be triggered under other debt instruments.
 Our credit facility includes variable rates, which subject us to interest rate risk and could cause our debt service obligations to increase and net income and cash flows to correspondingly decrease.
 Borrowings under the credit facility are at variable rates of interest and expose us to interest rate risk. In the recent past, inflation and other factors have resulted in an increase in interest rates generally. If interest rates were to continue to increase, our debt service obligations on the variable rate indebtedness referred to above would increase even if the principal amount borrowed remained the same, and our net income and cash flows would correspondingly decrease.
 In addition, the senior secured credit facility references the Secured Overnight Financing Rate ("SOFR") as the primary benchmark rate for our variable rate indebtedness. SOFR is a relatively new reference rate with a limited history, and changes in SOFR have, on occasion, been more volatile than changes in other benchmark or market rates. As a result, the amount of interest payable on our variable rate indebtedness is difficult to predict.

 Risks Related to the Transaction
 We may not realize the anticipated financial and other benefits, including growth opportunities, expected from the Transaction.
 We expect to realize synergies, growth opportunities and other financial and operating benefits as a result of the Transaction. The success of Amentum in realizing these benefits, and the timing of their realization, depends, among other things, on the successful integration following the Transaction. Even if we are able to integrate successfully, we cannot predict with certainty if or when these synergies, growth opportunities and other benefits will be realized, or the extent to which they will actually be achieved. For example, some of the benefits from the Transaction are being and may be offset by costs incurred in integrating the businesses. Realization of any synergies, growth opportunities or other benefits could be affected by the factors described in other risk factors and a number of factors beyond our control, including, without limitation, general economic conditions, increased operating costs and regulatory developments.
 Any contractual arrangements may be on less favorable terms than the existing arrangements from which the Company benefits, may not efficiently mitigate dis-synergies arising from the Transaction, and may be inadequate to provide for the ongoing operation and growth of our business, preserve continuity for customers, deliver key capabilities or otherwise provide for continued cooperation in relevant business areas.
 If the distribution in connection with the Transaction does not qualify as a transaction that is tax-free for U.S. federal income tax purposes under Section 355 of the Internal Revenue Code, including as a result of actions taken in connection with the separation and distribution or the merger or as a result of subsequent acquisitions of shares of Jacobs or Amentum, then Jacobs and/or Jacobs' shareholders that received Amentum common stock in the distribution could be required to pay substantial U.S. federal income taxes, and, in certain circumstances, we could be obligated to indemnify Jacobs for any tax liability imposed on Jacobs arising from our actions or inactions.
 The consummation of the distribution was conditioned upon, among other things, the receipt by Jacobs of (1) the IRS ruling and (2) the distribution tax opinions from outside counsel and an accounting firm. Jacobs has received the distribution tax opinions and the IRS ruling, and although a private letter ruling from the IRS generally is binding on the IRS, if the factual representations or assumptions made in the letter ruling request are untrue or incomplete in any material respect or if undertakings made to the IRS in connection with the letter ruling request are or have been violated, then Jacobs will not be able

 to rely on the IRS ruling. In addition, the distribution tax opinions are based on, among other things, the IRS ruling as to the matters addressed by such ruling, current law and certain representations made by Jacobs and Amentum and certain assumptions. Any change in currently applicable law, which may be retroactive, or the failure of any representation or assumption to be true, correct and complete in all material respects, could adversely affect the conclusions reached by outside counsel and the accounting firm in the distribution tax opinions. The distribution tax opinions represent outside counsel's and the accounting firm's respective judgments and are not binding on the IRS or the courts, and the IRS or the courts may not agree with the conclusions reached in such opinions.
 In general, if the distribution were determined not to qualify as a transaction described in Section 355 of the Code, for U.S. federal income tax purposes each U.S. holder of Jacobs common stock who received Amentum common stock in the distribution would generally be treated as receiving a taxable distribution equal to the fair market value of the Amentum common stock received by the U.S. holder, which would generally result in: (1) a taxable dividend to the U.S. holder to the extent of the U.S. holder's pro rata share of Jacobs' current and accumulated earnings and profits; (2) a reduction in the U.S. holder's basis (but not below zero) in Jacobs common stock to the extent the amount received exceeds the U.S. holder's share of Jacobs' earnings and profits; and (3) a taxable gain from the exchange of Jacobs common stock to the extent the amount received exceeds the sum of the U.S. holder's share of Jacobs' earnings and profits and the U.S. holder's basis in its Jacobs common stock. Further, for any clean-up distributions by Jacobs, each U.S. holder who receives Amentum common stock in the clean-up distribution would generally be treated as receiving a taxable distribution equal to the fair market value of the Amentum common stock received by the U.S. holder in the clean-up distribution.
 In addition, if the contribution and certain related transactions in the internal reorganization were determined not to qualify as a transaction described in Sections 355 and 368(a)(1)(D) of the Code for U.S. federal income tax purposes, or if the distribution were determined not to qualify as a transaction described in Section 355 of the Code for U.S. federal income tax purposes, Jacobs generally would recognize taxable gain with respect to the transfer of Amentum common stock in the distribution and in any clean-up distribution (or in prior steps of the internal reorganization), which could result in significant tax to Jacobs.
 Even if the contribution and certain related transactions in the internal reorganization, otherwise qualify as a transaction described in Sections 355 and 368(a)(1)(D) of the Code, and the distribution otherwise qualifies as a transaction described in Section 355 of the Code, the distribution (or prior steps of the internal reorganization) would nonetheless be taxable to Jacobs (but not to U.S. holders of Jacobs common stock) pursuant to Section 355(e) of the Code if one or more persons acquire a 50% or greater interest (measured by vote or value) in the stock of Jacobs or Amentum, directly or indirectly, as part of a plan or series of related transactions that includes the distribution. For purposes of Section 355(e) of the Code, any acquisitions of Jacobs or Amentum stock, directly or indirectly, within the period beginning two years before the distribution and ending two years after the distribution are generally presumed to be part of such a plan, although Jacobs may, depending on the facts and circumstances, be able to rebut that presumption. Further, for purposes of this test, the merger will be treated as part of a plan that includes the distribution, but it is expected that the merger, standing alone, will not cause the distribution to be taxable to Jacobs under Section 355(e) of the Code because Jacobs' shareholders owned at least 50.1% of the common stock of Amentum immediately following the merger. However, if the IRS were to determine that other acquisitions of Jacobs stock, either before or after the distribution, or Amentum stock, after the merger, were part of a plan or series of related transactions that included the distribution, such determination could result in the recognition of a significant amount of taxable gain by Jacobs (but not by Jacobs' shareholders) for U.S. federal income tax purposes under Section 355(e) of the Code.
 Under the tax matters agreement, Amentum may be obligated, in certain cases, to indemnify Jacobs against taxes and certain tax-related losses in connection with the transactions that arise as a result of Amentum's or Amentum Equityholder's actions, or failure to act. Any such indemnification obligation likely would be substantial and likely would have a material adverse effect on Amentum.
 Under the terms of the Transaction, we are restricted from taking certain actions that could adversely affect the intended tax treatment of the transactions, and such restrictions could limit our ability to implement strategic initiatives that otherwise would be beneficial.
 The tax matters agreement executed in connection with the Transaction generally restricts us and our affiliates from taking certain actions after the distribution of CMS that could adversely affect the intended tax treatment of the Transaction. In particular, for a two-year period following the distribution date, except as described below:
 • Amentum will continue the active conduct of CMS's trade or business and the trade or business of certain CMS subsidiaries;
 • Amentum will not voluntarily dissolve or liquidate or permit certain CMS subsidiaries to voluntarily dissolve or liquidate;
 • Amentum will not enter into, and will not permit certain CMS subsidiaries to enter into, any transaction or series of transactions (or any agreement, understanding, or arrangement) as a result of which one or more persons would acquire

 (directly or indirectly) stock comprising 50% or more of the vote or value of the Amentum (taking into account the stock acquired pursuant to the merger) or such CMS subsidiaries;
 • Amentum will not engage in, or permit certain CMS subsidiaries to engage in, certain mergers or consolidations;
 • Amentum will not, and will not permit certain CMS subsidiaries to, sell, transfer or otherwise dispose of (i) 30% or more of the gross assets of CMS, certain CMS subsidiaries, or (ii) the active trade or business of CMS or certain CMS subsidiaries, subject to certain exceptions;
 • Amentum will not, and will not permit certain CMS subsidiaries to, redeem or repurchase stock or rights to acquire stock;
 • Amentum will not, and will not permit certain CMS subsidiaries to, permit any shareholder of Amentum or of such CMS subsidiaries to become a "controlling shareholder" within the meaning of Treasury Regulations Section 1.355-7;
 • Amentum will not, and will not permit certain CMS subsidiaries to, amend their certificates of incorporation (or other organizational documents) or take any other action affecting the voting rights of any stock or stock rights of Amentum or such CMS subsidiaries;
 • Amentum will not, and will not permit certain CMS subsidiaries to, take any other action that would, when combined with any other direct or indirect changes in ownership of Amentum stock (including pursuant to the merger), have the effect of causing one or more persons to acquire stock representing 50% or more of the vote or value of Amentum, or otherwise jeopardize the tax-free status of the transactions;
 • Amentum Equityholder will not, and will not permit its direct owners or its affiliates to, directly or indirectly acquire any stock of Amentum and certain CMS subsidiaries; and
 • Amentum Equityholder will not, and will not permit its direct owners or its affiliates to, permit Amentum or certain CMS subsidiaries to enter into any transaction or series of transactions (or any agreement, understanding, or arrangement) as a result of which one or more persons would acquire (directly or indirectly) stock comprising 50% or more of the vote or value of Amentum (taking into account the stock acquired pursuant to the merger) or such CMS subsidiaries; unless, in each case (except with respect to the second-to-last bullet above), prior to taking any such action, (1) Amentum or Amentum Equityholder, as applicable, shall have requested that Jacobs obtain a private letter ruling from the IRS and Jacobs shall have received such private letter ruling in form and substance satisfactory to Jacobs in its sole and absolute discretion, (2) Amentum or Amentum Equityholder, as applicable, shall have provided Jacobs with an unqualified tax opinion in form and substance satisfactory to Jacobs in its sole and absolute discretion, or (3) Jacobs shall have waived the requirement to obtain such private letter ruling or unqualified tax opinion.
 Failure to adhere to these requirements could result in tax being imposed on Jacobs for which Amentum could bear responsibility and for which Amentum could be obligated to indemnify Jacobs under the tax matters agreement. Any such indemnification obligation would likely be substantial and would likely have a material adverse effect on Amentum. In addition, even if Amentum is not responsible for tax liabilities of Jacobs under the tax matters agreement, Amentum nonetheless could be liable under applicable tax law for such liabilities if Jacobs were to fail to pay such taxes. Moreover, these restrictions could have a material adverse effect on Amentum's liquidity and financial condition, and otherwise could impair Amentum's ability to implement strategic initiatives and Amentum's indemnity obligation to Jacobs might discourage, delay or prevent a change of control that Amentum shareholders may consider favorable.
 Our accounting and other management systems and resources may not be adequate to meet the financial reporting and other requirements to which we are subject as a publicly traded company. Fulfilling our obligations incident to being a public company and implementing the requirements of and related rules under the Sarbanes-Oxley Act of 2002, is expensive and time-consuming, and any delays or difficulty in satisfying these obligations could have a material adverse effect on our future results of operations and our stock price.
 Starting in fiscal year 2025, as a public company, the Sarbanes-Oxley Act of 2002 and the related rules and regulations of the SEC, as well as the New York Stock Exchange rules, require us to adhere to various corporate governance practices and a variety of reporting requirements and complex accounting rules. Compliance with these public company obligations requires us to devote significant management time and place significant additional demands on our finance, accounting, and legal staff and on our management systems, including our financial, accounting and information systems. Other expenses associated with being a public company include increased auditing, accounting, and legal fees and expenses, investor relations expenses, increased directors' fees and director and officer liability insurance costs, registrar and transfer agent fees, listing fees, as well as other expenses.
 In particular, starting in fiscal year 2025, the Sarbanes-Oxley Act of 2002 requires us to document and test the effectiveness of our internal control over financial reporting in accordance with an established internal control framework, and to report on our conclusions as to the effectiveness of our internal controls. It also requires an independent registered public accounting firm to

 test our internal control over financial reporting and report on the effectiveness of such controls. In addition, we are required under the Exchange Act to maintain disclosure controls and procedures and internal control over financial reporting. Because of inherent limitations in any internal control environment, there can be no assurance that all control issues and instances of fraud, errors or misstatements, if any, within the Company has been or will be detected on a timely basis. Such deficiencies could result in the correction or restatement of financial statements of one or more periods.
 Any failure to maintain effective controls or implement new or improved controls, or difficulties encountered in their implementation, could harm our operating results or cause us to fail to meet our reporting obligations. We also rely on third parties for certain calculations and other information that support our accounting and financial reporting, which includes reports from such organizations on their controls and systems that are used to generate this data and information. Any failure by such third parties to provide us with accurate or timely information or to implement and maintain effective controls may cause us to fail to meet our reporting obligations as a publicly traded company. In addition, as we operate our financial management systems, we could experience deficiencies in their operation that could have an adverse effect on the effectiveness of our internal control over financial reporting.
 In the future, when required, if we are unable to conclude that we have effective internal control over financial reporting, or if our independent registered public accounting firm is unable to provide us with an unqualified report regarding the effectiveness of our internal control over financial reporting, investors could lose confidence in the reliability of our consolidated financial statements, which could result in a decrease in the value of our common stock. Starting in fiscal year 2025, failure to comply with the Sarbanes-Oxley Act of 2002 could potentially subject us to sanctions or investigations by the SEC, the New York Stock Exchange, or other regulatory authorities.
 Certain of our directors and officers may have conflicts of interest because of their former positions with or financial interests in Jacobs.
 Because of their former positions with Jacobs, certain of our directors and officers own Jacobs common stock. Even though our board of directors consists of a majority of directors who are independent, some of our directors continue to have a financial interest in Jacobs common stock. Continuing ownership of Jacobs common stock could create, or appear to create, potential conflicts of interest if we have disagreements with Jacobs about the contracts between us that continue or face decisions that could have different implications for us and Jacobs.
 Our amended and restated certificate of incorporation contains a provision renouncing our interest and expectancy in corporate opportunities.
 Our amended and restated certificate of incorporation provides for the allocation of certain corporate opportunities between us and affiliates of Amentum Equityholder. Under these provisions, neither Amentum Equityholder, its affiliates and subsidiaries, nor any of its or their officers, directors, agents, stockholders, members or partners have any duty to communicate or offer any corporate opportunity to us and to the fullest extent of the law shall not be liable to us or our shareholders for breach of fiduciary duty or otherwise solely by reason of the fact that Amentum Equityholder or its affiliate acquires a corporate opportunity for itself, directs such opportunity to another person or otherwise does not communicate such opportunity to us. For instance, a director of our company who also serves as a director, officer or employee of an affiliate of Amentum Equityholder may pursue certain acquisitions or other opportunities that may be complementary to our business and, as a result, such acquisition or other opportunities may not be available to us. These potential conflicts of interest could have a material adverse effect on our business, financial condition and results of operations if attractive corporate opportunities are allocated by affiliates of Amentum Equityholder to itself or its subsidiaries or affiliates instead of to us.
 Delaware law and anti-takeover provisions in our amended and restated articles of incorporation, amended and restated bylaws, stockholders agreement and other governance documents may impede or discourage a takeover or change of control and limit the power of our shareholders.
 We are a Delaware corporation. Certain anti-takeover provisions of the Delaware general corporation law impose restrictions on the ability of others to acquire control of us. In addition, certain provisions of our governance documents may impede or discourage a takeover. For example:
 • vacancies occurring on our board can be filled only by our Board of Directors;
 • increasing or decreasing the size of the Board of Directors will require the affirmative vote of at least 80% of the members of the Board of Directors at such time;
 • prior to the second anniversary of the closing date, Sponsor Stockholder must vote its Amentum common stock in favor of the Executive Chair of the Board of Directors and shall not seek, propose or vote its Amentum common stock in favor of their removal, other than for cause;
 • shareholders do not have the right to call a special meeting or to act by written consent;

 • certain of the provisions in our amended and restated certificate of incorporation require supermajority shareholder approval for amendments;
 • shareholders will have to follow certain procedures and notice requirements in order to present certain proposals or nominate directors for election at shareholder meetings;
 • the stockholders agreement prohibits, for three years following the closing of the transactions, amendments to our amended and restated certificate of incorporation and bylaws to provide the stockholders with proxy access rights; and
 • our Board of Directors has the power to designate and issue, without any further vote or action by our shareholders, shares of preferred stock from time to time in one or more series.
 In addition, we are subject to Section 203 of the Delaware General Corporation Law (the "DGCL"), which could have the effect of delaying or preventing a change of control that you may favor. Section 203 provides that, subject to limited exceptions, persons that acquire, or are affiliated with persons that acquire, more than 15% of the outstanding voting stock of a Delaware corporation may not engage in a business combination with that corporation, including by merger, consolidation or acquisitions of additional shares, for a three-year period following the date on which that person or any of its affiliates becomes the holder of more than 15% of the corporation's outstanding voting stock.
 These types of provisions, as well as the stockholders agreement, could make it more difficult for a third party to acquire control of us, even if the acquisition would be beneficial to our shareholders. Accordingly, shareholders may be limited in the ability to obtain a premium for their shares.

 Risks Related to Our Common Stock
 Amentum Equityholder owns a significant percentage of our common stock.
 Amentum Equityholder holds a substantial portion of the issued and outstanding shares of Amentum common stock. Amentum Equityholder also holds the right to nominate members to stand for election to our Board of Directors. As a result, Amentum Equityholder has a significant influence on matters requiring shareholder approval, including the election of directors and other corporate decisions. Amentum Equityholder (including its affiliates) may have interests that differ from other shareholders. This will limit shareholders' ability to influence corporate matters, and as a result, actions may be taken that shareholders may not view as beneficial and may also adversely affect the trading price of our common stock.
 Affiliates of Amentum Equityholder are private equity firms in the business of making investments in entities in a variety of industries. Conflicts of interest could arise in the future between us, on the one hand, and the affiliates of Amentum Equityholder, on the other hand, including the portfolio companies of such equityholders, concerning among other things, potential competitive business activities or business opportunities. The other portfolio companies of the affiliates of Amentum Equityholder may compete with us for investment or business opportunities. These conflicts of interest may not be resolved in our favor. We have also renounced our interest in certain business opportunities.
 In addition, Amentum Equityholder, as Sponsor Stockholder under the stockholders agreement, has certain rights with respect to director nominations. In particular, Amentum Equityholder has the right to nominate a specified number of directors for election to our Board of Directors, depending on its level of ownership of our common stock. Specifically, if Amentum Equityholder beneficially owns at least 25.1% of the issued and outstanding shares of our common stock, Amentum Equityholder is entitled to nominate to stand for election five individuals, two of whom must qualify as independent, to a 13-member Board of Directors. If Amentum Equityholder beneficially owns at least 15% but less than 25.1% of the issued and outstanding shares of our common stock, Amentum Equityholder is entitled to nominate to stand for election three individuals, none of whom must qualify as independent, to a 13-member Board of Directors. If Amentum Equityholder beneficially owns at least 5% but less than 15% of the issued and outstanding shares of our common stock, Amentum Equityholder is entitled to nominate to stand for election one individual to a 13-member Board of Directors. If the Board of Directors consists of a number of directors other than 13, then the number of individuals Amentum Equityholder is entitled to nominate, if any, will be adjusted to be 5/12ths of the number of directors constituting the Board of Directors at any time Amentum Equityholder beneficially owns at least 25.1% of the issued and outstanding shares of our common stock, 1/4th of the number of directors constituting the Board of Directors at any time Amentum Equityholder beneficially owns at least 15% but less than 25.1% of the issued and outstanding shares of our common stock or 1/12th of the number of directors constituting the Board of Directors at any time Amentum Equityholder beneficially owns at least 5% but less than 15% of the issued and outstanding shares of our common stock, in each case, rounded down to the nearest whole number, provided that, prior to the date on which Amentum Equityholder no longer owns at least 5% of our issued and outstanding shares of common stock (the "Fallaway Date"), if rounding down would otherwise result in Amentum Equityholder being entitled to designate a total of zero director nominees on the Board of Directors, such adjustment will instead be rounded up to one director nominee. For the absence of doubt, in no event will Amentum Equityholder be entitled to designate more than 5/12ths of the number of directors on the Board of Directors. From and after the Fallaway Date, Amentum Equityholder will no longer be entitled to nominate any individuals to the Board of Directors.

 Amentum Equityholder has distributed the shares of our common stock that it holds to its limited partners. The affiliates of the private equity firms that are the largest equity holders in Amentum Equityholder hold a substantial portion of the issued and outstanding shares of Amentum common stock and assume the rights and obligations of Amentum Equityholder as the Sponsor Stockholder under the stockholders agreement that are described above.
 Our quarterly results may fluctuate significantly, which could have a material negative effect on the price of our common stock.
 Our quarterly operating results may fluctuate significantly or fall below the expectations of securities analysts, which could have a material adverse impact on the price of our common stock. Fluctuations are caused by a number of factors, including:
 • legal proceedings, disputes and/or government investigations;
 • fluctuations in the spending patterns of our government and commercial customers;
 • U.S. federal government budgetary process, including government shutdowns;
 • the number and significance of contracts executed during a quarter;
 • unanticipated changes in contract performance, particularly with contracts that have funding limits;
 • the timing of resolving change orders, requests for equitable adjustments and other contract adjustments;
 • delays incurred in connection with a contract;
 • changes in prices of commodities or other supplies;
 • changes in foreign currency exchange rates;
 • weather conditions that delay work at work sites;
 • the timing of expenses incurred in connection with acquisitions or other corporate initiatives;
 • the decision by the Board of Directors to begin or cease paying a dividend, and the expectation that if we pay dividends, we will declare dividends at the same or higher levels in the future;
 • natural disasters or other crises;
 • staff levels and utilization rates;
 • changes in prices of services offered by our competitors; and
 • general economic and political conditions.
 There can be no assurance that we will pay dividends on our common stock.
 We do not expect to declare or pay any cash dividends on our common stock. Any future determination as to the timing, declaration, amount and payment of any dividends will be within the discretion of our Board of Directors, and will depend upon, among other things, our financial condition, earnings, capital requirements of our operating subsidiaries, regulatory constraints, industry practice, ability to access capital markets and other factors deemed relevant by our Board of Directors, including legal and contractual restrictions. Moreover, if we determine to pay any dividends in the future, there can be no assurance that we will continue to pay such dividends or the amount of such dividends.
 Your percentage of ownership in Amentum may be diluted in the future.
 Your percentage ownership may be diluted in the future by the equity awards that we expect to grant to our directors, officers and other employees. We have approved an incentive plan that provides for the grant of common stock-based equity awards to our directors, officers and other employees. In addition, we may issue equity as all or part of the consideration paid for acquisitions and strategic investments that we may make in the future or as necessary to finance our ongoing operations.
 A significant number of shares of our common stock may be sold or otherwise disposed of, which may cause our stock price to decline.
 Any sales of substantial amounts of our common stock in the public market, or the perception that such sales might occur may cause the market price of our common stock to decline. As of October 3, 2025, we have an aggregate of 243,464,776 shares of common stock issued and outstanding. We cannot predict whether large amounts of our common stock will be sold in the open market. We are also unable to predict whether a sufficient number of buyers of our common stock to meet the demand to sell shares of our common stock at attractive prices would exist at that time.
 Our stock price may be volatile.

 The market price of our common stock may fluctuate widely, depending on many factors, some of which may be beyond our control, including:
 • actual or anticipated fluctuations in our operating results due to factors related to our business;
 • success or failure of our business strategies;
 • our quarterly or annual earnings, or those of other companies in our industry;
 • our ability to obtain financing as needed;
 • announcements by us or our competitors of significant acquisitions or dispositions;
 • changes in accounting standards, policies, guidance, interpretations or principles;
 • the failure of securities analysts to cover our common stock after the separation and distribution;
 • changes in earnings estimates by securities analysts or our ability to meet those estimates;
 • the operating and stock price performance of other comparable companies;
 • investor perception of our company and our industry;
 • overall market fluctuations;
 • results from any material litigation or government investigation;
 • changes in laws and regulations (including tax laws and regulations) affecting our business;
 • changes in capital gains taxes and taxes on dividends affecting shareholders; and
 • general economic conditions and other external factors.
 Low trading volume for our stock could amplify the effect of the above factors on our stock price volatility.
 Stock markets in general have experienced volatility that has often been unrelated to the operating performance of a particular company. These broad market fluctuations could adversely affect the trading price of our common stock.
 Our amended and restated certificate of incorporation designates certain courts within the State of Delaware as the exclusive forum for certain types of actions and proceedings that may be initiated by our stockholders, and the federal district courts of the United States as the exclusive forum for the resolution of any complaint asserting a cause of action under the Securities Act, which could limit our shareholders' ability to choose the judicial forum for disputes with us or our directors, officers or employees.
 Our amended and restated certificate of incorporation requires, to the fullest extent permitted by law, that (i) any derivative action or proceeding brought on behalf of the Company, (ii) any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers, employees or shareholders to us or our shareholders, (iii) any action asserting a claim arising pursuant to any provision of our amended and restated certificate of incorporation, amended and restated bylaws or the DGCL, or as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware and (iv) any other action asserting a claim against us that is governed by the internal affairs doctrine, in each case, may be brought only in specified courts in the State of Delaware. As described below, this provision applies to suits brought to enforce any duty or liability created by the Securities Act or the Exchange Act, or any other claim for which there is exclusive federal or concurrent federal and state jurisdiction.
 Our amended and restated certificate of incorporation provides that the federal district courts of the United States of America will be the exclusive forum for the resolution of any complaint asserting a cause of action under the Securities Act. However, Section 22 of the Securities Act provides that federal and state courts have concurrent jurisdiction over lawsuits brought pursuant to the Securities Act or the rules and regulations thereunder. To the extent the exclusive forum provision restricts the courts in which claims arising under the Securities Act may be brought, there is uncertainty as to whether a court would enforce such a provision. Our amended and restated certificate of incorporation also provides that any person or entity purchasing or otherwise acquiring or holding any interest in shares of our capital stock will be deemed to have notice of and to have consented to the foregoing provisions; provided, however, that investors cannot waive compliance with the federal securities laws and the rules and regulations thereunder. This provision does not apply to claims brought under the Exchange Act.
 We recognize that the forum selection clause in our amended and restated certificate of incorporation may impose additional litigation costs on shareholders in pursuing any such claims, particularly if the shareholders do not reside in or near the State of Delaware. Additionally, the forum selection clause in our amended and restated certificate of incorporation may limit our shareholders' ability to bring a claim in a forum that they find favorable for disputes with us or our directors, officers, employees or agents, which may be costlier and may discourage such lawsuits against us and our directors, officers, employees

 and agents even though an action, if successful, might benefit our shareholders, although such shareholders will not be deemed to have waived our compliance with federal securities laws and the rules and regulations thereunder. The Court of Chancery of the State of Delaware may also reach different judgments or results than would other courts, including courts where a shareholder considering an action may be located or would otherwise choose to bring the action, and such judgments may be more or less favorable to us than our shareholders.

 Risks Related to Climate Change
 Climate change-related weather issues could have a material adverse impact on our, or our customers', equipment and infrastructure which could negatively impact our business, financial condition and results of operations.
 Climate change-related events, such as increased frequency and severity of storms, floods, wildfires, droughts, hurricanes, freezing conditions, excessive heat and other natural disasters, may have a long-term impact on our business, financial condition and results of operations. For example, access to clean water and reliable energy in the locations where we conduct our services is critical to our operations. Flooding, high winds and fires could damage our equipment, or infrastructure at our customer sites, causing safety hazards and environmental damage. Accordingly, a natural disaster, such as a severe storm, flood or electrical blackout due to severe heat, has the potential to disrupt our and our customers' businesses and may cause us to experience work stoppages, project delays, financial losses and additional costs to resume operations, including increased insurance costs or loss of coverage, legal liability and reputational losses.
 Further, the risks caused by climate change span across the full spectrum of the industry sectors we serve. The direct physical risks that climate change poses to infrastructure through chronic environmental changes, such as rising sea levels and temperatures, and acute events, such as hurricanes, droughts and wildfires, exist in each of these sectors. Infrastructure owners could face increased costs to maintain their assets, which could result in reduced profitability and fewer resources for our services and solutions. These types of physical risks could in turn lead to or be accompanied by transitional risks (i.e., societal changes in response to the threat of climate change), such as market and technology shifts, including decreased demand for our services and solutions, reputational risks, such as how our values and practices regarding a low carbon transition are viewed by external and internal stakeholders, as well as policy and legal risks, such as the extent to which low-carbon transitions are driven by the governments in the jurisdictions in which we operate around the globe, all of which could have a material adverse impact on our business, financial condition and results of operations.
 We may be affected by market or regulatory responses to climate change.
 Growing public concern about climate change has resulted in increased focus by local, state, regional, national and international regulatory bodies on GHG emissions and climate change issues, which impacts our operations globally. New regulatory requirements, as well as related policy changes, could increase the costs of the contracts we conduct for our customers or, in some cases, prevent a program from going forward, thereby potentially reducing the demand for our services, which could in turn have a material adverse impact on our business, financial condition and results of operations. However, policy changes and climate legislation could also increase the overall demand for our services as our customers and partners work to decarbonizing their industries, transitioning from fossil fuels to renewable energy sources and developing integrated and sustainable solutions, which could have a positive impact on our business. We cannot predict when or whether any of these various proposals may be enacted or what the precise effects may be on us or on our customers.
 We may also incur additional expenses as a result of U.S. and international regulators requiring additional public disclosures regarding GHG emissions, and/or broader environmental, social or governance-related performance indicators and other factors. The financial and management resources required to achieve and maintain compliance with such regulations may be significant, particularly given the fact that various countries and regions are implementing different, and in some cases conflicting, requirements.

 General Risk Factors
 Demand for our services is impacted by economic downturns, reductions in government or private spending and times of political uncertainty.
 We provide full spectrum engineering and technology solutions to customers operating in a number of sectors and industries, including programs for various national governments, including the United States, United Kingdom and Australia; aerospace; automotive; pharmaceuticals and biotechnology; infrastructure; environmental; nuclear services, including decommissioning, power solutions and new nuclear technologies; and other general industrial and consumer businesses and sectors. These sectors and industries and the resulting demand for our services have been, and we expect will continue to be, subject to significant fluctuations due to a variety of factors beyond our control, including economic conditions and changes in customer spending, particularly during periods of economic or political uncertainty. Consequently, our results have varied, and may continue to vary, depending upon the demand for future projects in the markets and the locations in which we operate.

 Uncertain global economic, socioeconomic and political conditions may negatively impact our customers' ability and willingness to fund their projects, including their ability to raise capital and pay, or timely pay, our invoices. These factors may also cause our customers to reduce their capital expenditures, alter the mix of services purchased, seek more favorable pricing and other contract terms and otherwise slow their spending on our services. For example, in the public sector, declines in tax revenues as well as other economic declines may result in lower government spending. In addition, under such conditions, many of our competitors may be more inclined to take greater or unusual risks or accept terms and conditions in contracts that we might not deem acceptable. These conditions may reduce the demand for our services, which may have a material adverse impact on our business, financial condition and results of operations.
 Additionally, uncertain economic, socioeconomic and political conditions may make it difficult for our customers, our vendors, and us to accurately forecast and plan future business activities. We cannot predict the outcome of changing trade policies or other unanticipated socioeconomic or political conditions, nor can we predict the timing, strength or duration of any economic recovery or downturn worldwide or in our customers' markets. Weak economic conditions could have a material adverse impact on our business, financial condition and results of operations. Furthermore, if a significant portion of our projects are concentrated in a specific geographic area or industry, our business may be disproportionately affected by regional conflicts, negative trends or economic downturns in those specific geographic areas or industries.
 We may not be able to protect our intellectual property or that of our customers.
 Our technology and intellectual property provide us, in certain instances, with a competitive advantage. Although we seek to protect our intellectual property through registration, enforcement, licensing, contractual arrangements, security controls and similar mechanisms, we may not be able to successfully preserve our rights, and they could lapse, expire or be invalidated, narrowed in scope, circumvented, challenged or become obsolete. Trade secrets are generally difficult to protect. We implement technical and administrative measures to protect our confidential information and trade secrets, including by requiring our employees and contractors be subject to confidentiality and invention assignment obligations, but such measures may be inadequate to deter or prevent misappropriation of our confidential information or otherwise protect our intellectual property. In addition, the laws of some foreign countries in which we operate do not protect intellectual property rights to the same extent as the laws of the U.S. If we are unable to enforce, protect and maintain our intellectual property rights or if there are any successful intellectual property challenges or infringement proceedings against our intellectual property or us, our ability to differentiate our service offerings could be reduced. Litigation to enforce our intellectual property against third parties, to defend against third-party claims of intellectual property infringement, or to determine or challenge the scope, validity or enforceability of intellectual property rights, even if we ultimately prevail, could be costly and could divert our leadership's attention away from other aspects of our business.
 We also hold licenses to third-party technology or intellectual property which may be utilized in our business operations. If we are no longer able to license such technology or intellectual property on commercially reasonable terms or at all, our business and financial performance could be adversely affected.
 We may use third-party open source software in our products. Some open source licenses, such as "copyleft" open source licenses, require end-users who distribute software and services that include open source software to also make available all or part of such software's source code. If our activities were determined to be non-compliant with the terms of any applicable "copyleft" open source licenses, we may be required to publicly release all or part of our proprietary source code for limited or no cost and our business and financial performance could be adversely affected.
 If our intellectual property rights or work processes become obsolete, we may not be able to differentiate our service offerings and some of our competitors may be able to offer more attractive services to our customers. Our competitors may independently attempt to develop or obtain access to technologies that are similar or superior to our technologies.
 We will also need to continue to respond to and anticipate changes resulting from artificial intelligence and other similarly disruptive technologies. If we are not successful in preserving and protecting our intellectual property rights and licenses, including trade secrets, or in staying ahead of developing artificial intelligence technologies, our business, financial condition and results of operations could be materially adversely affected.
 Our customers or other third parties may also provide us with their proprietary technology and intellectual property. There is a risk we may not sufficiently protect our or their information from improper use or dissemination and, as a result, could be subject to claims and litigation and resulting liabilities, loss of contracts or other consequences that could have a material adverse impact on our business, financial condition and results of operations.
 Government authorities may obtain certain information related to, or rights in or to the intellectual property in, our products or services. This may allow government authorities to disclose such information or license such intellectual property to third parties, including our competitors, which could have a material adverse impact on our business, financial condition and results of operations.

 Indemnity provisions in various agreements to which we are party potentially expose us to substantial liability for infringement, misappropriation or other violation of intellectual property rights, data protection and other losses.
 Our agreements with our customers and other third parties may include indemnification provisions under which we agree to indemnify or otherwise be liable to them for losses suffered or incurred as a result of claims of infringement, misappropriation, or other violation of intellectual property rights, data protection, compliance with laws, damages caused by us to property or persons, or other liabilities relating to or arising from our products or services, our acts or omissions under such agreements, or other contractual obligations. Any dispute with a customer or other third party with respect to such obligations could have adverse effects on our relationship with such customer or other third party and other existing or prospective customers, reduce demand for our products or services, and adversely affect our business, financial conditions, and results of operations.
 Impairment of long-lived assets or restructuring activities may require us to record a significant charge to earnings.
 Our long-lived assets, including our lease right-of-use assets, equity method investments and others, are subject to periodic testing for impairment. Failure to achieve sufficient levels of cash flow at the asset group level could result in impairment of our long-lived assets. Further changes in the business environment could lead to changes in the scope of operations of our business. These changes, including the closure of one or more offices, could result in restructuring and/or asset impairment charges.
 Our success depends, in part, on our ability to work with complex and rapidly changing technologies to meet the needs of our customers.
 We design and develop technologically advanced and innovative products and services utilized by our customers in various environments. The needs of our customers change and evolve regularly, including in response to complex and rapidly evolving technologies. Our success depends upon our ability to identify emerging technological trends, develop technologically advanced, innovative and cost-effective products and services and market these products and services to our customers. Our success also depends on our continued access to suppliers of important technologies and components. Many of our contracts contain performance obligations that require innovative design capabilities, are technologically complex, or depend on factors not wholly within our control. Problems and delays in development or delivery as a result of issues with respect to design, technology, licensing and intellectual property rights, labor, learning curve assumptions or materials and components could prevent us from achieving such contractual requirements. Failure to meet these obligations could adversely affect our business, financial condition and results of operations. In addition, our offerings cannot be tested and proven in all situations and are otherwise subject to unforeseen problems that could negatively affect revenue and profitability, such as problems with quality and workmanship, country of origin and delivery of subcontractor services. Among the factors that may affect revenue and profits could be unforeseen costs and expenses not covered by insurance or indemnification from the customer, diversion of management focus in responding to unforeseen problems, loss of follow-on work, and, in the case of certain contracts, repayment to the government customer of contract costs and fee payments we previously received.
 We use artificial intelligence, machine learning, data science and similar technologies in our business, and challenges with properly managing such technologies could result in reputational harm, competitive harm, and legal liability, and adversely affect our business, financial condition and results of operations.
 Artificial intelligence, machine learning, data science and similar technologies (collectively, "AI") may be enabled by, or integrated into, some of our solutions or may be used in the development of our solutions. As with many developing technologies, AI presents risks and challenges that could affect its further development, adoption, and use, and therefore our business. AI algorithms may be flawed or biased. Datasets used to train or develop AI systems may be insufficient, unlawfully obtained, of poor quality, or contain biased information. Such datasets may also contain personal data or other protected information or third-party content for which insufficient rights, including intellectual property rights, have been obtained. The use or integration of AI systems trained on such datasets, or of the outputs generated by such systems, may result in the infringement or other violation of third-party rights (including intellectual property or data privacy rights), and may otherwise result in liability, including legal liability, or adversely affect our business, reputation, brand, financial condition and results of operations. Inappropriate, biased, discriminatory, illegal or otherwise wrongful practices by data scientists, engineers, and end-users of our systems or elsewhere (including the integration or use of third-party AI tools) could impair the acceptance of AI solutions and could result in burdensome new regulations that may limit our ability to use existing or new AI technologies. If the recommendations, forecasts, analyses, or other content that AI applications produce or assist in producing are, or are alleged to be, deficient, inaccurate, unfair, discriminatory, biased, or otherwise wrongful or unlawful we could be subject to competitive harm, legal liability, and brand or reputational harm. In addition, we expect that there will continue to be new laws or regulations concerning the use of AI. It is possible that certain governments may seek to regulate, limit, or block the use of AI in our products and services or otherwise impose other restrictions that may affect or impair the usability or efficiency of our services for an extended period of time or indefinitely. Our competitors or other third parties may incorporate AI into their product development, product offerings, technology and infrastructure products more quickly or more successfully than us, which could impair our ability to compete effectively and adversely affect our business, financial condition and results of operations.

 We maintain our cash at financial institutions, often in balances that exceed federally insured limits.
 The majority of our cash is held in accounts at U.S. banking institutions that we believe are of high quality. Cash held in depository accounts may at times exceed the $250,000 Federal Deposit Insurance Corporation insurance limits. If such banking institutions were to fail, we could lose all or a portion of those amounts held in excess of such insurance limitations. Any material loss that we may experience in the future could have a material adverse effect on our financial position and could materially impact our ability to pay our operational expenses or make other payments. Banking institution failures, or changes in legislation and regulation, may adversely impact other entities that would, in turn, impact us. If our customers, suppliers, insurers, joint venture partners, sureties, or other parties with whom we do business with are affected by issues in the banking industry it may have an adverse impact on our operational and financial performance.
 Our businesses could be materially and adversely affected by events outside of our control.
 Extraordinary or force majeure events beyond our control, such as natural or human caused disasters, pandemics, and geopolitical conflicts, could negatively impact our ability to operate. As an example, from time to time we face unexpected severe weather conditions that may result in weather-related delays that are not always reimbursable under a fixed-price contract; evacuation of personnel and curtailment of services; increased labor and material costs in areas resulting from weather-related damage and subsequent increased demand for labor and materials for repairing and rebuilding; inability to deliver materials, equipment and personnel to work locations in accordance with contract schedules; and loss of productivity. Among other things, a pandemic could have significant adverse health consequences for our employees, limit their ability to perform work, and reduce our ability to perform our contracts.
 When making contract proposals, we rely heavily on our estimates of costs and timing to complete the associated projects, as well as assumptions regarding technical issues. However, we may remain obligated to perform our services after any natural or human caused event, unless a force majeure clause or other contractual provision provides us with relief from our contractual obligations. Our profitability may be adversely affected when we incur contract costs that we cannot bill to our customers. If we are not able to react quickly to such events, or if a high concentration of our projects is in a specific geographic region that suffers from a natural or human caused catastrophe, our operations may be significantly affected, which could have a material adverse impact on our operations. In addition, if we cannot complete our contracts on time, we may be subject to potential liability claims by our customers which may reduce our profits.
 The expiration of our collective bargaining agreements could result in increased operating costs or work disruptions, which could potentially affect our results of operations.
 Some of our employees are covered by collective bargaining agreements with unions. The length of these agreements varies. We cannot predict how stable our union relationships will be or whether we will be able to successfully negotiate successor agreements without impacting our financial condition, and may, in the future, experience labor disruptions associated with the expiration or renegotiation of collective bargaining agreements or otherwise, which may cause a significant disruption of operations. In addition, we may face increased operating costs as a result of higher wages or benefits paid to union members, which could adversely affect our business, financial condition and results of operations.
 Our benefit plan expenses and obligations may fluctuate depending on various factors, including inflation and changes in levels of interest rates.
 We have various employee benefit plan obligations that require us to make contributions to satisfy, over time, our underfunded benefit obligations, which are generally determined by calculating the projected benefit obligations minus the fair value of plan assets. We may have to contribute additional cash to meet any underfunded benefit obligations. If we are required to contribute a significant amount of the deficit for underfunded benefit plans, our cash flows could be materially and adversely affected.
 Additionally, we provide health care and other benefits to our employees. In recent years, costs for health care have increased more rapidly than general inflation in the U.S. economy. If this trend in health care costs continues, our cost to provide such benefits could increase, which could have a material adverse impact on our financial condition and results of operations.
 We are also a participating employer in various Multi-Employer Pension Plans ("MEPPs") associated with some of the work we perform on a union basis, which MEPPs are managed by third-party trusts and over which we have no control, including as to how the MEPPs are managed or financial investment decisions are made. If any of these MEPPs is underfunded, we could face the imposition of underfunded liability or withdrawal liability at a materially adverse level.
 Current and future environmental, health, and safety laws could require significant additional costs to achieve or maintain compliance and/or to address liabilities.
 We are subject to environmental, health, and safety laws and regulations governing, among other things, discharges to air and water, the handling, storage and disposal of hazardous or nuclear wastes or substances, the remediation of contamination and the protection of human health and safety in each of the jurisdictions in which we operate. These laws and regulations and the risk of attendant litigation can cause significant delays to a project and add significantly to its cost. Violations of these

 regulations could subject us and our management to civil and criminal penalties and other liabilities, including claims for personal injury or property or environmental damages. Failure to comply with any environmental, health, or safety laws or regulations, whether actual or alleged, may expose us to fines, penalties or potential litigation liabilities, including costs, settlements and judgments, any of which could adversely affect our business, financial condition and results of operations.
 Various U.S. federal, state, local and foreign environmental laws and regulations may impose liability for property or environmental damages, including natural resources damages, as well as the investigation and cleanup of hazardous or nuclear wastes or substances on property currently or previously owned by us, or by third parties, or otherwise arising out of our waste management and disposal or environmental remediation activities. These laws may impose responsibility and liability without regard to knowledge of or fault in connection with the presence of contaminants. Liabilities incurred under these laws may be retroactive, as well as joint and several. The discovery of additional contaminants or the future imposition of new or unanticipated clean-up obligations at these or other sites could have a material adverse impact on our financial condition and results of operations.
 Future changes to health, safety, and environmental laws and regulations could affect us in significant and currently unpredictable ways. Such changes could, for example, result in the relaxation or repeal of laws and regulations relating to the environment, which could decrease our compliance costs but also result in a decline in the demand for our environmental services and, in turn, could negatively impact our revenue. New environmental laws and regulations, remediation obligations, enforcement actions, as well as stricter standards or stricter interpretations of existing requirements, or the future discovery of contamination or claims for damages to persons, property, natural resources or the environment could result in material costs and liabilities that we currently do not anticipate. At this time, it is not possible for us to predict the extent to which any such changes, if enacted, would result in operational or business risks or opportunities for the Company.
 A failure to attract, train, retain and utilize skilled employees and our senior management team would adversely affect our ability to execute our strategy and may disrupt our operations.
 The success of our business is dependent upon our ability to hire, retain and utilize qualified personnel, including engineers, architects, designers, craft personnel and corporate leadership professionals who have the required experience and expertise at a reasonable cost. Competition for skilled personnel is intense, and competitors aggressively recruit key employees. In addition, many U.S. federal government programs require contractors to have security clearances and specialized training. Depending on the level of required clearance, security clearances can be difficult and time-consuming to obtain and personnel with security clearances are in great demand. Particularly in highly specialized areas, it has become more difficult to retain employees and meet all of our needs for employees in a timely manner, which may affect our growth in the current and future fiscal years. Although we intend to continue to devote significant resources to recruit, train and retain qualified employees, we may not be able to attract, effectively train and retain these employees. Any failure to do so could impair our ability to efficiently perform our contractual obligations, meet our customers' needs in a timely manner and ultimately win new business, all of which could adversely affect our future results. In addition, salaries and related costs are a significant portion of the cost of providing our services and, accordingly, our ability to efficiently utilize our workforce impacts our profitability. If our employees are under-utilized, our profitability could suffer.
 We believe that our success also depends on the continued employment of a highly qualified and experienced senior management team and that team's ability to retain existing business and generate new business. The loss of key personnel in critical functions could lead to lack of business continuity or disruptions in our business until we are able to hire and train replacement personnel.
 We may experience a negative impact to our reputation as a result of socio-political opposition to U.S. government policies that are reflected in U.S. government contracts we bid, win and perform.
 From time to time, we may bid, win and perform government contracts that are the result of U.S. government policies that may be opposed by certain stockholders, suppliers, customers or other stakeholders. Any resulting negative impact on our reputation may have a material adverse impact on our business, financial condition, results of operations and stock price.

 Item 1B. Unresolved Staff Comments
 None.

 Item 1C. Cybersecurity
 The Company's Board of Directors (the "Board") is responsible for overseeing the Company's risk management program and cybersecurity is a critical element of this program. Management is responsible for the day-to-day administration of the Company's risk management program and its cybersecurity policies, processes, and practices. The Company's cybersecurity policies, standards, processes, and practices are based on recognized frameworks established by the National Institute of Standards and Technology, the International Organization for Standardization and other applicable industry standards and are standalone from the Company's overall risk management system and processes. In general, the Company seeks to address

 material cybersecurity threats through a company-wide approach that addresses the confidentiality, integrity, and availability of the Company's information systems or the information that the Company collects and stores, by assessing, identifying and managing cybersecurity issues as they occur.
 Cybersecurity Risk Management and Strategy
 The Company's cybersecurity risk management strategy focuses on several areas:
 • Identification and Reporting: The Company has implemented a comprehensive, cross-functional approach to assessing, identifying and managing material cybersecurity threats and incidents. The Company's program includes controls and procedures to properly identify, classify and escalate certain cybersecurity incidents to provide management visibility and obtain direction from management as to the public disclosure and reporting of material incidents in a timely manner.
 • Technical Safeguards: The Company has implemented technical safeguards that are designed to defend the Company's information systems from cybersecurity threats. These safeguards include network security capabilities such as firewalls, intrusion prevention and detection systems; endpoint protection capabilities such as anti-malware functionality; and access controls, which are evaluated for accuracy on a quarterly basis. The Company has also implemented email protection to minimize phishing attacks and ensure integrity in digital communications. We baseline our assets according to the technical controls recommended in the National Institute of Standards and Technology Special Publication 800-171 ("NIST SP 800-171").
 • Cyber Intelligence & Continuous Monitoring: The Company has established continuous monitoring of our environment through a third party and receives alerts on threats and policy violations to ensure we meet our 96 hour window to report material matters to the SEC. The Company is a member the Defense Industry Base ("DIB") and receives cyber intelligence based on current threat actors and tactics, techniques and procedures ("TTP's") from the DIB organization, the Federal Bureau of Investigation ("FBI") cyber division, Department of Homeland Security, and the National Security Agency Cybersecurity Collaboration Center ("NSA CCC").
 • Incident Response and Recovery Planning: The Company has established and maintains comprehensive incident response, business continuity, and disaster recovery plans designed to address the Company's response to a cybersecurity incident. The Company conducts annual tabletop exercises that simulate a cyber-attack to test these plans and ensure personnel are familiar with their roles in a response scenario.
 • Third-Party Risk Management: The Company maintains a comprehensive, risk-based approach to identifying and overseeing material cybersecurity threats presented by third parties, including vendors, service providers, and other external users of the Company's systems, as well as the systems of third parties that could adversely impact our business in the event of a material cybersecurity incident affecting those third-party systems, including any outside auditors or consultants who advise on the Company's cybersecurity systems.
 • Education and Awareness: The Company provides regular, mandatory training for all levels of employees regarding cybersecurity threats as a means to equip the Company's employees with effective tools to address cybersecurity threats, and to communicate the Company's evolving information security policies, standards, processes, and practices.
 The Company conducts periodic assessment and testing of the Company's policies, standards, processes, and practices in a manner intended to address cybersecurity threats and events. The Company performs quarterly penetration tests against both externally facing assets and internal assets. The Company also performs monthly and ad-hoc vulnerability scanning. Lastly, we collaborate with the NSA CCC to scan our public facing assets for vulnerabilities against the latest advanced persistent threats. The results of such assessments, audits, and reviews are evaluated by management and reported to the Board, and the Company adjusts its cybersecurity policies, standards, processes, and practices as necessary based on the information provided by these assessments, audits, and reviews.
 Governance
 The Board oversees the Company's risk management program, including the management of cybersecurity threats. The Board will receive regular presentations and reports on developments in the cybersecurity space, including risk management practices, recent developments, evolving standards, vulnerability assessments, third-party and independent reviews, the threat environment, technological trends, and information security issues encountered by the Company's peers and third parties. The Board will receive prompt and timely information regarding any cybersecurity risk that meets pre-established reporting thresholds, as well as ongoing updates regarding any such risk. On an annual basis, the Board will discuss the Company's approach to overseeing cybersecurity threats with the Company's Chief Information Security Officer ("CISO") and other members of senior management.
 The CISO, in coordination with senior management, works collaboratively across the Company to implement a program designed to defend the Company's information systems from cybersecurity threats and to promptly respond to any material

 cybersecurity incidents in accordance with the Company's incident response and recovery plans. To facilitate the success of the Company's cybersecurity program, cross-functional teams throughout the Company address cybersecurity threats and respond to cybersecurity incidents. Through ongoing communications with these teams, the CISO and senior management are informed about and monitor the prevention, detection, mitigation and remediation of cybersecurity threats and incidents in real time, and report such threats and incidents to the Board when appropriate. To ensure prompt reporting and compliance with SEC requirements, the Board has adopted a "Cybersecurity Incident Materiality Assessment Policy."
 The CISO is a retired Air Force veteran who has served in various roles in information technology, information security and the U.S. Government for over 30 years. The CISO most recently served as the Chief Information Security Officer of Optiv Security and previously served as the Executive Director, Classified Cybersecurity, at Lockheed Martin. The CISO holds an associates degree in criminal justice from the Community College of the Air Force, an undergraduate degree in information technology from the University of Phoenix, and a graduate degree in information systems security from Colorado Technical University. The CISO has attained the professional certifications of Certified Information Systems Security Professional with a concentration in Management, Certified Chief Information Security Officer, and Certified Ethical Hacker.
 Material Effects of Cybersecurity Incidents
 Our operations are subject to cybersecurity risks, including unauthorized access, system failures, and breaches that could originate from both internal networks and through third-party suppliers and service providers. While we have not experienced a material impact on our business strategy, results of operations and/or financial condition resulting from cybersecurity threats or previous cybersecurity incidents, such events have the potential to have a material adverse effect on our business strategy, results of operations and financial condition, including by damaging or interrupting access to our information systems or networks, compromising confidential or otherwise protected information, destroying or corrupting data, or otherwise disrupting our operations. We continuously monitor our networks for unauthorized access attempts and maintain defensive measures; however, the dynamic nature of cyber threats means we cannot guarantee prevention of all potential future incidents that could materially impact our business operations, financial condition, or strategic objectives. Even if we successfully defend our own digital technologies and services, we also rely on providers of third-party products, services, and networks, with whom we may share data and services, and who may be unable to effectively defend their digital technologies and services against attack.

 Item 2. Properties
 As of October 3, 2025, we conducted our operations in 315 leased locations and two owned locations occupying over seven million square feet collectively. Our major organizational support locations are in Virginia, Maryland, Nevada, Tennessee and Texas within the United States as well as Krakow, Poland, Dubai, UAE, Bangalore, India and Warrington, United Kingdom globally, where we occupy approximately 500,000 square feet collectively. We have additional significant business operations and support facilities located in Virginia, Maryland, Florida, Colorado, Indiana, South Carolina, Alabama, and Connecticut within the United States as well as London, Theale, Manchester and Warrington in the United Kingdom, where we occupy an additional approximately 500,000 square feet collectively. We also have employees working at customer sites throughout the U.S. and in other countries.
 The nature of our business is such that there is no practicable way to relate occupied space to our reportable segments.

 Item 3. Legal Proceedings
 Information required with respect to this item is set forth in Note 21 — Legal Proceedings and Commitments and Contingencies to the Amentum Holdings, Inc. consolidated financial statements included elsewhere in this Annual Report on Form 10-K.

 Item 4. Mine Safety Disclosures
 Not applicable.

 Item 5. Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
 Market Information
 Our common stock has been listed on the New York Stock Exchange under the ticker symbol "AMTM" since September 30, 2024. Prior to that time, there was no public market for our stock. However, "when issued" trading for our common stock commenced on September 24, 2024.
 Number of Holders
 As of November 14, 2025, there were 2,359 holders of record of our common stock. The number of stockholders of record is not representative of the number of beneficial stockholders due to the fact that many shares are held by depositories, brokers, or nominees.
 Capital Deployment
 Our present policy is to retain earnings to provide funds for the operation and expansion of our business and to repay debt. We do not intend to pay any cash dividends at this time. The Board of Directors will determine whether to pay dividends in the future based on conditions existing at that time, including our earnings, financial condition, and capital requirements, as well as economic and other conditions as the board may deem relevant.
 Performance Comparison Graph
 The following graph shows a comparison from September 30, 2024 (the date our common stock was listed on the New York Stock Exchange) through October 3, 2025 of the total return for our common stock, with the comparable cumulative total returns of the Russell 1000 index and the Dow Jones U.S. Computer Services Total Stock Market index. The graph assumes that $100 was invested at the market close on September 30, 2024 in our common stock and in each of the indexes (including reinvestment of dividends). The stock price performance of the following graph is not necessarily indicative of future stock price performance.

 Equity Compensation Plans
 See Item 12, contained in Part III of this Annual Report for information regarding our equity compensation plans.
 Recent Sales of Unregistered Equity Securities and Use of Proceeds

 None.
 Purchases of Equity Securities by the Issuer and Affiliated Purchasers
 During the fiscal year ended October 3, 2025, we did not repurchase any shares of our common stock.

 Item 6. [Reserved]

 Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

 The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the other sections of this information statement, including our audited consolidated financial statements, and notes thereto, "Risk Factors," and "Cautionary Note Regarding Forward-Looking Statements." This discussion contains forward-looking statements that involve risks and uncertainties, all of which are based on our current expectations and could be materially affected by the uncertainties and other factors described throughout this information statement and particularly in the sections entitled "Risk Factors" and "Cautionary Note Regarding Forward-Looking Statements." You should review those sections for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.
 References to "Amentum", the "Company", "we", "our" or "us" refer to Amentum Holdings, Inc. and its subsidiaries unless otherwise stated or indicated by context.

 Overview
 We are a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, and customers in international and commercial markets, supporting programs of critical national importance across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We offer a broad reach of capabilities including energy, environmental remediation, intelligence and counter threat solutions, data fusion and analytics, engineering and integration, advanced test, training and readiness, and citizen solutions. As a leading provider of differentiated technology solutions, we have built a repertoire of deep customer knowledge, enabling us to engage our customers across multiple capabilities and markets. Underpinned by a strong culture of ethics and safety, Amentum is committed to operational excellence and successful execution.
 We conduct our business activities and report financial results as two reportable segments: Digital Solutions ("DS") and Global Engineering Solutions ("GES"). The DS segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients. The GES segment provides large-scale environmental remediation, nuclear power solutions, platform engineering, sustainment and supply chain management across all 7 continents for the U.S. government and allied nations. The presentation of financial results as two reportable segments is consistent with the way the Company operates its business and the manner in which our chief operating decision maker ("CODM"), currently our Chief Executive Officer, manages the operations of the Company for purposes of allocating resources and assessing performance.

 Budgetary and Regulatory Environment
 In fiscal year 2025, we generated approximately 81% of our revenues from contracts with the U.S. federal government, either as a prime contractor or a subcontractor to other contractors engaged in work for the U.S. federal government. We carefully follow the U.S. federal budget, legislative and contracting trends and activities and evolve our strategies accordingly.
 In May 2025, the President's U.S. federal government fiscal year ("GFY") 2026 budget request was submitted to Congress. As compared to the GFY 2025 budget, the GFY 2026 budget request maintained defense discretionary spending at $892 billion, reduced non-defense discretionary spending by approximately 21% to $557 billion, and increased GFY 2026 defense spending to $1.01 trillion, an increase of 13% from the GFY 2025 enacted level. Final appropriations legislation for GFY 2026 was not passed as of October 1, 2025, the first day of GFY 2026, and the federal government shut down most agencies of the federal government until November 12, 2025, when a continuing resolution was passed to reopen the federal government and provide funding through January 30, 2026. While we view the budget environment as constructive and believe core funding sources for our primary customer-based markets will continue to experience bipartisan tailwinds, there can be no certainty about the level of funding for any particular GFY or that appropriations bills will be passed in a timely manner. During those periods of time when appropriations bills have not been passed and signed into law, government agencies operate under a continuing resolution ("CR"), a temporary measure allowing the government to continue operations at prior year funding levels. Depending on their scope, duration, and other factors, CRs can negatively impact our business due to delays in new program starts, delays in contract awards decisions, and other factors.
 Under the Trump administration, the Department of Government Efficiency was created, the One Big, Beautiful Bill Act was passed which made certain tax cuts permanent, reduced healthcare spending and increased spending related to border security, defense, NASA and energy production, and the U.S. Government is in the process of, or has announced its intent to, increase

 current tariffs, impose additional tariffs, and expand tariffs on goods imported from various countries into the United States. We continue to monitor the actions of the administration which could result in a change to budgetary priorities or impact federal government procurement timing. Although a limited number of our contracts for the U.S. Government have been affected by changes in budgetary priorities by the administration, the impact has not been material to date. Decreases in, or delays in approving, the federal government's budget, decreases in government spending on the types of programs that we support, delays in government contract awards, and pauses on government contracts on which we are currently performing could have an adverse impact on our business.

 Market Environment
 We believe our scale, breadth of capabilities, and depth of experience give us a robust understanding of our customers' evolving needs. Given our portfolio diversity, we believe our total addressable market, and associated growth rate, is sufficient to support our strategic growth plans.
 We believe Amentum's capabilities are strategically aligned to well-funded, long-term priorities for the federal government, allied nations, and commercial customers. Specifically, we believe we are well positioned to continue to win new business driven by the following trends in our addressable market:
 • Increasing demand for outsourced services and solutions with federal government customers;
 • Increased global demand for clean and environmentally sustainable solutions;
 • Increased spending on government-wide modernization priorities;
 • Increasing government focus on near-peer competitors and other nation state threats;
 • Increasing discretionary spending for Indo-Pacific regional activities and initiatives; and
 • Increased investment in advanced technologies (e.g., hypersonics, microelectronics, unmanned, electromagnetic spectrum).

 Results of Operations for the Years Ended October 3, 2025, September 27, 2024 and September 29, 2023
 The following table presents our results of operations for the periods presented:

 For the Year Ended October 3, 2025
 For the Year Ended September 27, 2024
 For the Year Ended September 29, 2023

 2024 to 2025
 2023 to 2024

 (Dollars in millions)

 $
 $
 6,005
 71.6
 %
 $
 8,388
 $
 6.6
 %
 $
 7,865

 (12,880)
 (5,290)
 69.7
 (7,590)
 (507)
 7.2
 (7,083)

 Selling, general, and administrative expenses
 (616)
 (263)
 74.5
 (353)
 (56)
 18.9
 (297)

 Amortization of intangibles
 (479)
 (251)
 110.1
 (228)
 (23.5)
 (298)

 Equity earnings of non-consolidated subsidiaries
 (12)
 (16.2)
 32.1

 Goodwill impairment charges
 —
 —
 —
 —
 (100.0)
 (186)

 Operating income
 64.9
 410.5

 Interest expense and other, net
 (353)
 (19.4)
 (438)
 (41)
 10.3
 (397)

 Loss on extinguishment of debt
 (12)
 (73.3)
 (45)
 (45)
 —
 —

 Gain on acquisition of controlling interest
 —
 (69)
 (100.0)
 —
 —

 Income (loss) before income taxes
 (193.5)
 (123)
 (63.8)
 (340)

 (Provision) benefit for income taxes
 (56)
 (96)
 (240.0)
 110.5

 (171.1)
 (83)
 (74.1)
 (321)

 Less: net income (loss) attributable to non-controlling interests
 600.0
 (6)
 (85.7)

 $
 $
 (180.5)
 $
 (82)
 $
 (73.9)
 $
 (314)

 Results of Operations October 3, 2025 vs September 27, 2024
 Revenues — The increase in revenues was primarily attributable to revenues from the merger with CMS.
 Cost of revenues — The increase in cost of revenues was primarily attributable to the increased revenues volume from the merger with CMS. As a percentage of revenues, cost of revenues was 89.5% and 90.5% for the years ended October 3, 2025 and September 27, 2024, respectively.

 Selling, general, and administrative expenses ("SG&A") — The increase in SG&A was primarily attributable to the merger with CMS. SG&A as a percentage of revenues increased to 4.3% for the year ended October 3, 2025 from 4.2% for the year ended September 27, 2024 primarily due to the merger with CMS and an increase in acquisition, transaction and integration costs.
 Amortization of intangibles — Amortization of intangibles primarily relates to the amortization of our backlog and customer relationship intangible assets, which increased due to the merger with CMS.
 Equity earnings of non-consolidated subsidiaries — Equity earnings of non-consolidated subsidiaries include our proportionate share of the income from equity method investments and decreased due to utilization of fair market value adjustments assigned to certain equity method investments obtained in the merger with CMS partially offset by the performance of our non-consolidated subsidiaries.
 Interest expense and other, net — The decrease in interest expense and other, net was primarily due to the reduction to our Term Loan principal balance as compared to the year ended September 27, 2024 combined with a decrease in interest rates, partially offset by the interest incurred on our Senior Notes during the fiscal year ended October 3, 2025.
 Loss on extinguishment of debt — The loss on extinguishment of debt for the year ended October 3, 2025 was due to $722 million of voluntary principal payments on the Term Loan. The loss on extinguishment of debt for the year ended September 27, 2024 was due to a loss on the debt modification of $14 million and debt issuance costs of $31 million.
 Gain on acquisition of controlling interest — The gain on acquisition of controlling interest was primarily due to the acquisition of a joint venture which was accounted for as a business combination achieved in stages, in which the Company's previously held equity interest in the joint venture was remeasured to fair value, resulting in a gain of $69 million during the fiscal year ended September 27, 2024.
 (Provision) benefit for income taxes — The effective tax rate for the year ended October 3, 2025 was 48.7%, as compared to 32.5% for the year ended September 27, 2024. The change in the effective tax rate was primarily due to the recognition of a valuation allowance against a deferred tax asset related to disallowed interest expense, release of a valuation allowance related to domestic capital losses, and the tax effect of the Rapid Solutions divestiture during the year ended October 3, 2025.
 Net income attributable to non-controlling interests — Net income attributable to non-controlling interests includes the utilization of fair market value adjustments assigned to certain non-controlling interests obtained in the merger with CMS partially offset by the minority interests in our consolidated joint ventures that are not wholly-owned.
 Results of Operations September 27, 2024 vs September 29, 2023
 Revenues — The increase in revenues was primarily attributable to new contract awards and growth on existing programs.
 Cost of revenues — The increase in cost of revenues was primarily driven by increased revenue volume. As a percentage of revenues, cost of revenues was 90.5% and 90.1% for the years ended September 27, 2024 and September 29, 2023, respectively.
 Selling, general, and administrative expenses — SG&A as a percentage of revenues increased from 3.8% for the year ended September 29, 2023 to 4.2% for the year ended September 27, 2024 primarily due to an increase in acquisition, transaction and integration costs.
 Amortization of intangibles — Amortization of intangibles primarily relates to the amortization of our backlog and customer relationship intangible assets, which decreased as a result of the accelerated method of amortization utilized to amortize our intangibles which best approximates the proportion of the future cash flows estimated to be generated in each period over the estimated useful life of the applicable asset.
 Equity earnings of non-consolidated subsidiaries — Equity earnings of non-consolidated subsidiaries include our proportionate share of the income from equity method investments and increased due to performance and operational efficiencies during the year ended September 27, 2024.
 Goodwill impairment charges — In the fiscal year ended September 27, 2024, we completed our annual goodwill impairment test and concluded that no impairment charge was necessary as a result of this assessment. During the fiscal year ended September 29, 2023, we performed goodwill impairment tests which concluded that the carrying value of certain reporting units exceeded fair value. As a result, a non-cash impairment charge of $186 million was recognized during the year ended September 29, 2023.
 Interest expense and other, net — The increase in interest expense and other, net was primarily due to an increase in interest rates on our variable rate debt and a reduced benefit from our interest rate swaps.
 Loss on extinguishment of debt — The loss on extinguishment of debt was due to a loss on the debt modification of $14 million and debt issuance costs of $31 million during the fiscal year ended September 27, 2024.

 Gain on acquisition of controlling interest — The gain on acquisition of controlling interest was primarily due to the acquisition of a joint venture which was accounted for as a business combination achieved in stages, in which the Company's previously held equity interest in the joint venture was remeasured to fair value, resulting in a gain of $69 million during the fiscal year ended September 27, 2024.
 Benefit for income taxes — The effective tax rate for the year ended September 27, 2024 was 32.5%, as compared to 5.6% for the year ended September 29, 2023. The change in the effective tax rate was primarily due to the partial release of a valuation allowance against a deferred tax asset related to disallowed interest expense during the year ended September 27, 2024 and the impact of goodwill impairment charges recognized during the year ended September 29, 2023 that are nondeductible for income tax purposes.
 Net (loss) income attributable to non-controlling interests — Net income attributable to non-controlling interests include the minority interests in our consolidated joint ventures that are not wholly-owned, which decreased due to performance on certain consolidated joint ventures and the completion of certain contracts.

 Segment Results for the Years Ended October 3, 2025, September 27, 2024 and September 29, 2023
 The primary financial performance measures we use to manage our reportable segments and monitor results of operations are Revenues and Adjusted EBITDA. The following tables present our performance measures by reportable segment:
 Digital Solutions

 For the Year Ended October 3, 2025
 For the Year Ended September 27, 2024
 For the Year Ended September 29, 2023

 2024 to 2025
 2023 to 2024

 (Dollars in millions)

 $
 5,543
 $
 3,562
 %
 $
 1,981
 $
 %
 $
 1,899

 Adjusted EBITDA (1)

 %
 —
 —
 %

 (1) Represents a Non-GAAP financial measure - see the related explanations included below and Note 18 — Segment Information in Part II of this Annual Report on Form 10-K.
 The increase in revenues for the year ended October 3, 2025, as compared to the year ended September 27, 2024, was primarily attributable to revenues from the merger with CMS, higher volume from new contract awards and the benefit of additional working days, partially offset by the expected ramp-down of historical programs and the divestiture of Rapid Solutions.
 The increase in Adjusted EBITDA for the year ended October 3, 2025, as compared to the year ended September 27, 2024, was primarily attributable to the revenue growth factors described above.
 The increase in revenues for the year ended September 27, 2024, as compared to the year ended September 29, 2023, was primarily attributable to new contract awards and growth on existing programs. Adjusted EBITDA remained consistent year-over-year.
 Global Engineering Solutions
 For the Year Ended October 3, 2025
 For the Year Ended September 27, 2024
 For the Year Ended September 29, 2023

 2024 to 2025
 2023 to 2024

 (Dollars in millions)

 $
 8,850
 $
 2,443
 %
 $
 6,407
 $
 %
 $
 5,966

 Adjusted EBITDA (1)

 %
 %

 (1) Represents a Non-GAAP financial measure - see the related explanations included below and Note 18 — Segment Information in Part II of this Annual Report on Form 10-K.
 The increase in revenues for the year ended October 3, 2025, as compared to the year ended September 27, 2024, was primarily attributable to revenues from the merger with CMS, the ramp up of new contract awards, growth on existing programs and the benefit of additional working days, partially offset by the transition of contracts from consolidated to unconsolidated joint ventures and the expected ramp-down of historical programs.
 The increase in Adjusted EBITDA for the year ended October 3, 2025, as compared to the year ended September 27, 2024, was primarily attributable to the revenue growth factors described above.
 The increase in revenues and adjusted EBITDA for the year ended September 27, 2024, as compared to the year ended September 29, 2023, was primarily attributable to new contract awards and growth on existing programs.
 Non-GAAP Financial Measures

 We include the presentation and discussion of Adjusted EBITDA, which is not a measure of financial performance under Generally Accepted Accounting Principles in the United States ("GAAP"). Adjusted EBITDA should be considered only as supplement to and should not be considered in isolation or used as a substitute for financial information prepared in accordance with GAAP. Management of the Company believes Adjusted EBITDA, when read in conjunction with the Company's financial statements prepared in accordance with GAAP and the reconciliation herein to the most directly comparable GAAP measure, provides useful information to management, investors and other users of the Company's financial information in evaluating operating results and understanding operating trends by adjusting for the effects of items we do not consider to be indicative of the Company's ongoing performance, the inclusion of which can obscure underlying trends. Additionally, management of the Company uses Adjusted EBITDA in its evaluation of business performance, particularly when comparing performance to past periods, and believes Adjusted EBITDA is useful for investors because it facilitates a comparison of financial results from period to period. The computation of a non-GAAP measure may not be comparable to similarly titled measures reported by other companies, thus limiting their use for comparability.
 Adjusted EBITDA
 The Company defines Adjusted EBITDA as net income (loss) attributable to common shareholders adjusted for interest expense and other, net, provision for income taxes, depreciation and amortization, and certain discrete items that are not considered in the evaluation of ongoing operating performance. These discrete items include acquisition, transaction, and integration costs, non-cash gains and losses, loss on extinguishment of debt, utilization of certain fair market value adjustments assigned in purchase accounting, and stock-based compensation. While we believe Adjusted EBITDA is a useful metric in evaluating operating performance by allowing better evaluation of underlying segment performance and better period-to-period comparability, it is not a metric defined by GAAP and may not be comparable to non-GAAP metrics presented by other companies. For a reconciliation of net income (loss), the most directly comparable financial measure calculated in accordance with GAAP, to adjusted EBITDA for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, see Note 18 — Segment Information in Part II of this Annual Report on Form 10-K.

 Backlog
 The Company's backlog represents the estimated amount of future revenues to be recognized under negotiated contracts. The Company's backlog includes unexercised option years and excludes the value of task orders that may be awarded under multiple award indefinite delivery / indefinite quantity ("IDIQ") vehicles until such task orders are issued.
 The Company's backlog is either funded or unfunded:
 • Funded backlog represents contract value for which funding is appropriated less revenues previously recognized on the contract.
 • Unfunded backlog represents estimated values that have the potential to be recognized as revenues from negotiated contracts for which funding has not been appropriated and from unexercised contract options.
 As of October 3, 2025, the Company had total backlog of $47.1 billion, compared with $45.0 billion as of September 27, 2024, an increase of $2.1 billion primarily due to new contract awards partially offset by revenue recognized during the year ended October 3, 2025. Funded backlog as of October 3, 2025 was $5.6 billion.
 The Company's backlog, by reportable segment and in total, consisted of the following (in millions):

 DS
 GES
 Total
 DS
 GES
 Total

 Funded backlog
 $
 2,634
 $
 2,951
 $
 5,585
 $
 3,736
 $
 3,828
 $
 7,564

 Unfunded backlog
 17,989
 23,570
 41,559
 15,148
 22,258
 37,406

 Total backlog
 $
 20,623
 $
 26,521
 $
 47,144
 $
 18,884
 $
 26,086
 $
 44,970

 There is no assurance that all backlog will result in future revenues being recognized, and the backlog balance is subject to increases or decreases based on the execution of new contracts, contract modifications or extensions, deobligations, early terminations, and other factors.

 Revenues by Contract Type
 Our earnings and profitability may vary materially depending on changes in the proportionate amount of revenues derived from each type of contract. For a discussion of the types of contracts under which we generate revenues, see "Critical Accounting Policies" below. The following table summarizes revenues by contract type as a percentage of each reportable segment and total Amentum for the periods presented:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 Cost-plus-fee
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Fixed-price
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Time-and-materials
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Total
 %
 %
 %
 %
 %
 %
 %
 %
 %

 Effects of Inflation
 Given the nature of our operations and contract type mix, we expect the impact of inflation on our business may be limited for some of our contracts. During the fiscal year ended October 3, 2025, 63% of our revenues was generated under cost-plus-fee type contracts that have limited inflation risk as they include provisions that adjust revenues to cover costs affected by inflation. The remainder of our revenues was generated under time-and-materials or fixed-price type contracts which we have historically been able to price in a manner that accommodates inflation and cost increases over the period of performance but changes in our expectations with respect to inflation rates or in the overall mix of our contract types could cause future results to differ substantially.

 Liquidity and Capital Resources
 Existing cash and cash equivalents and cash generated by operations are our primary sources of liquidity, as well as sales of receivables under our Master Accounts Receivable Purchase Agreement ("MARPA") and available borrowing capacity under the revolving credit facility provided for in the senior secured credit facility (the "Credit Facility").
 The Credit Facility consists of our term facility ("Term Loan") maturing on September 27, 2031 and a $850 million revolving facility ("Revolver") maturing on September 27, 2029, which includes a $200 million letter of credit subfacility and a $100 million swingline subfacility. The Term Loan requires quarterly principal amortization payments of $9 million, which commenced on March 31, 2025, with the remainder of the principal thereunder being due at maturity. In August 2024, the Company also completed an offering of $1,000 million in aggregate principal amount of 7.250% senior notes due August 1, 2032 (the "Senior Notes").
 The Credit Facility and the Senior Notes are guaranteed by substantially all of our wholly owned material domestic restricted subsidiaries, subject to customary exceptions set forth in the credit agreement and indenture, respectively.
 The interest rates applicable to the Term Loan are floating interest rates equal to an Alternate Base Rate or Adjusted Term Secured Overnight Financing Rate ("SOFR") plus an applicable margin based upon our net leverage ratio.
 Each of the credit agreement and indenture requires us to comply with certain representations and warranties, customary affirmative and negative covenants and, in the case of the Revolver, under certain circumstances, a financial covenant. We were in compliance with all covenants as of October 3, 2025 and September 27, 2024.
 We believe that the combination of internally generated funds, available bank borrowings, and cash and cash equivalents on hand will provide the required liquidity and capital resources necessary to fund on-going operations, capital expenditures, scheduled principal and interest payments on our debt obligations, scheduled lease payments, and other working capital requirements over at least the next twelve months.
 On June 26, 2025, we completed the sale of a hardware and product business, Rapid Solutions, to Lockheed Martin Corporation for a purchase price of $360 million in cash.
 As part of our debt reduction initiatives, we made voluntary principal payments on the Term Loan of approximately $191 million, $250 million and $281 million on June 27, 2025, July 31, 2025 and September 30, 2025, respectively. Over the longer term, our ability to generate sufficient cash flows from operations necessary to fulfill the obligations under the Credit Facility, Senior Notes and any other indebtedness we may incur will depend on our future financial performance which could be affected by factors outside of our control, including, but not limited to, worldwide economic and financial market conditions.
 See "Note 7 — Sales of Receivables" and "Note 12 — Debt" in Part II of this Annual Report on Form 10-K for additional information.

 Cash Flow Information

 Net cash provided by operating activities
 $
 $
 $

 Net cash provided by (used in) investing activities
 (17)

 Net cash used in financing activities
 (790)
 (382)
 (112)

 Effect of exchange rate changes on cash and cash equivalents

 Net (decrease) increase in cash and cash equivalents
 $
 (15)
 $
 $
 (61)

 Cash Flows - October 3, 2025 vs September 27, 2024
 Net cash provided by operating activities increased by $496 million when compared to the year ended September 27, 2024 primarily as a result of a $542 million increase in cash earnings due to contributions from the merger with CMS and offset by $46 million in changes in operating assets and liabilities.
 Net cash provided by investing activities decreased by $247 million when compared to the year ended September 27, 2024 primarily as a result of the change in cash flows associated with the merger with CMS, partially offset by cash received from divestitures in the year ended October 3, 2025.
 Net cash used in financing activities increased by $408 million when compared to the year ended September 27, 2024 primarily due to increased principal payments on our Term Loan partially offset by financing activities completed in the year ended September 27, 2024 associated with the merger with CMS.
 Cash Flows - September 27, 2024 vs September 29, 2023
 Net cash provided by operating activities decreased by $20 million primarily as a result of the Transaction and debt modification and higher tax and interest payments, partially offset by cash inflows from sales of receivables under the MARPA.
 Net cash used in investing activities decreased by $492 million primarily as a result of the merger with CMS in the year ended September 27, 2024.
 Net cash used in financing activities increased by $270 million primarily as a result of repayment of the prior first and second lien credit agreements partially offset by proceeds from the borrowings under the Term Loan and Senior Notes, and a capital contribution provided in connection with the Transaction.

 Divestiture
 On June 26, 2025, we completed the sale of a hardware and product business, Rapid Solutions, to Lockheed Martin Corporation for a purchase price of $ 360 million in cash. Rapid Solutions was part of the DS segment.

 Contractual Obligations
 For a description of the Company's contractual obligations related to debt, pensions, leases, and retirement plans refer to "Note 10 — Retirement Plans", "Note 12 — Debt" and "Note 14 — Leases" in Part II of this Annual Report on Form 10-K.

 Commitments and Contingencies
 The Company is involved in various claims, disputes, lawsuits, investigations, audits, administrative proceedings and similar matters arising in the normal course of business. Liabilities for loss contingencies arising from such matters and other sources are recorded when it is probable that an unfavorable result and/or liability will be incurred and the cost of the unfavorable result or liability can be reasonably estimated. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company's operations and liquidity.
 For a discussion of these items, refer to "Note 21 — Legal Proceedings and Commitments and Contingencies" in Part II of this Annual Report on Form 10-K.

 Critical Accounting Policies and Estimates
 The process of preparing financial statements in conformity with GAAP requires the use of estimates and assumptions to determine reported amounts of certain assets, liabilities, revenues and expenses and the disclosure of related contingent assets and liabilities. These estimates and assumptions are based on information available at the time of the estimates or assumptions, including our historical experience, where relevant. Significant estimates and assumptions are reviewed quarterly by management. The evaluation process includes a thorough review of key estimates and assumptions used in preparing our financial statements. Because of the uncertainty of factors surrounding the estimates, assumptions and judgments used in the preparation of our financial statements, actual results may materially differ from the estimates.

 Our critical accounting policies and estimates are those policies and estimates that are both most important to our financial condition and results of operations and require the most difficult, subjective or complex judgments on the part of management in their application, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.
 We believe the following accounting policies require significant judgment due to the complex nature of the underlying transactions:
 Revenue Recognition
 Our services are generally performed under cost-plus-fee, fixed-price, or time-and-materials contracts which typically involve an annual base period of performance followed by renewal option periods that, once exercised, are generally accounted for as separate contracts.
 The transaction price is the estimated amount of fixed and variable consideration we expect to receive for performance of our contracts. Variable consideration is typically in the form of award or incentive fees or a combination thereof. Variable consideration is generally based upon various objective and subjective criteria, such as meeting performance or cost targets. These estimates are based on historical award experience, anticipated performance and our best judgment based on current facts and circumstances. Management continuously monitors these factors that may affect the quality of its estimates, and material changes in estimates are disclosed accordingly. Variable consideration is included in the estimated transaction price, to the extent that it is probable that a significant reversal of cumulative revenues recognized will not occur, and there is a basis to reasonably estimate the amount of variable consideration.
 The Company generally recognizes revenues over time throughout the contract performance period as control is transferred continuously to our customers as work progresses. We measure our progress towards completion using an input measure of total costs incurred divided by total costs expected to be incurred.
 Revenues on cost-plus-fee contracts are recorded as contract allowable costs are incurred and fees are earned. Revenues are recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations.
 Revenues on fixed-price contracts are recorded as work is performed over the period of performance. Revenues are recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations. Incurred cost represents work performed, which corresponds with the transfer of control to the customer. For such contracts, we estimate total costs at the inception of the contract based on our assumptions of the cost elements required to complete the associated tasks of the contract and assess the impact of the risks on our estimates of total costs to complete the contract. Our cost estimates are based on assumptions that include our employee labor costs, the cost of materials, and the performance of our subcontractors. These cost estimates are subject to change as we perform under the contract and as a result, the timing of revenues and amount of profit on a contract may change as there are changes in estimated costs to complete the contract. Such adjustments are recognized on a cumulative catch-up basis in the period we identify the changes. If total expected costs exceed total estimated contract revenues, a provision for the entire expected loss on the contract is recorded in the period in which the loss is identified. Total estimated losses are inclusive of any unexercised options that are probable of award, only if they increase the amount of the loss.
 Revenues for time-and-materials contracts are recorded based on the amount for which we have the right to invoice our customers, because the amount directly reflects the value of our work performed for the customer. Revenues are recorded on the basis of contract allowable labor hours worked multiplied by the contract defined billing rates, plus the direct costs and indirect cost burdens associated with materials and subcontract work used in performance on the contract. Generally, profits on time-and-materials contracts result from the difference between the cost of services performed and the contractually defined billing rates for these services.
 Business Combinations
 The Company records all tangible and intangible assets acquired and liabilities assumed in a business combination at fair value as of the acquisition date, with any excess purchase consideration recorded as goodwill. Determining the fair value of acquired intangible assets requires management to make significant judgments about expected future cash flows, weighted-average cost of capital, discount rates, useful lives of assets and expected long-term growth rates. During the measurement period, not to exceed one year from the acquisition date, the Company may adjust provisional amounts recorded to reflect new information subsequently obtained regarding facts and circumstances that existed as of the acquisition date.
 Goodwill represents the excess of amounts paid over the estimated fair value of net assets acquired from an acquisition. The Company evaluates goodwill for impairment annually on the first day of the fourth quarter of the fiscal year or whenever events or circumstances indicate that the carrying value may not be recoverable.

 The evaluation includes a qualitative or quantitative assessment that compares the estimated fair value of the relevant reporting unit to its respective carrying value, including goodwill, and utilizes both market and income approaches. Under the market approach, we estimate the fair value of a reporting unit based on comparable public companies within our industry that have operations with observable and comparable economic characteristics and are similar in nature, scope and size to the reporting unit being compared. Under the income approach, we estimate the fair value of a reporting unit using a discounted cash flow model which includes judgments and assumptions about expected growth rates, terminal earnings before interest, taxes, depreciation and amortization ("EBITDA") margins, discount rates based on weighted-average cost of capital, assumptions regarding future capital expenditures and observable inputs of other comparable companies. The fair value of each reporting unit is compared to the carrying amount of the reporting unit and if the carrying amount of the reporting unit exceeds the fair value, then an impairment loss is recognized for the difference.

 Recent Accounting Pronouncements
 See "Note 3 — Recent Accounting Pronouncements" in Part II of this Annual Report on Form 10-K for additional information.

 Item 7A. Quantitative and Qualitative Disclosure About Market Risk
 The remaining balance under the Term Loan, and any additional amounts that may be borrowed under the Revolver, are currently subject to interest rate fluctuations. We have the ability to manage these fluctuations in part through interest rate swaps on our variable rate debt. We have entered into floating-to-fixed interest rate swap agreements for an aggregate notional amount of $1.6 billion related to a portion of our variable rate debt. With every one percent fluctuation in the applicable interest rates, interest expense on our variable rate debt for the year ended October 3, 2025 would have fluctuated by approximately $38 million.

 Item 8. Financial Statements and Supplementary Data
 Index to Consolidated Financial Statements

 Consolidated Financial Statements

 Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)

 Consolidated Balance Sheets

 Consolidated Statements of Operations

 Consolidated Statements of Comprehensive Income (Loss)

 Consolidated Statements of Shareholders' Equity

 Consolidated Statements of Cash Flows

 Notes to Consolidated Financial Statements of Amentum Holdings, Inc.

 Note 1 — Organization and Description of Business

 Note 2 — Summary of Significant Accounting Policies

 Note 3 — Recent Accounting Pronouncements

 Note 4 — Acquisition and Divestiture

 Note 5 — Revenues

 Note 6 — Contract Balances

 Note 7 — Sales of Receivables

 Note 8 — Goodwill and Intangible Assets

 Note 9 — Income Taxes

 Note 10 — Retirement Plans

 Note 11 — Stock-Based Compensation

 Note 12 — Debt

 Note 13 — Fair Value of Financial Assets and Liabilities

 Note 14 — Leases

 Note 15 — Related Parties

 Note 16 — Joint Ventures

 Note 17 — Accumulated Other Comprehensive Income (Loss)

 Note 18 — Segment Information

 Note 19 — Composition of Certain Financial Statement Captions

 Note 20 — Earnings (Loss) Per Share

 Note 21 — Legal Proceedings and Commitments and Contingencies

 Report of Independent Registered Public Accounting Firm
 To the Shareholders and Board of Directors of Amentum Holdings, Inc.
 Opinion on the Financial Statements
 We have audited the accompanying consolidated balance sheets of Amentum Holdings, Inc. (the Company) as of October 3, 2025 and September 27, 2024, the related consolidated statements of operations, comprehensive income (loss), shareholders' equity and cash flows for each of the three years in the period ended October 3, 2025, and the related notes (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at October 3, 2025 and September 27, 2024, and the results of its operations and its cash flows for each of the three years in the period ended October 3, 2025, in conformity with U.S. generally accepted accounting principles.
 We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of October 3, 2025, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated November 25, 2025 expressed an unqualified opinion thereon.
 Basis for Opinion
 These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
 We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
 Critical Audit Matters
 The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the account to which it relates.

 Revenue recognition related to the cost-based input method for certain fixed-price contracts

 Description of the Matter
 As described in Note 2 to the consolidated financial statements, the Company generally recognizes revenue over time as performance obligations are satisfied as most of its contracts involve a continuous transfer of control to the customer. For many fixed-price contracts, revenue is recognized under a cost-based input method that requires an estimate of total costs at contract completion. Estimates of total costs at contract completion for these contracts can change over the contract performance period due to a wide range of variables, and these changes could affect the Company's results of operations.

Auditing total costs at contract completion for certain fixed-price contracts was complex due to the judgment involved in evaluating management's estimates of contract costs at completion which include cost elements required to complete associated tasks of the contract. These cost elements may include employee labor costs, the cost of materials, and the performance of subcontractors.

 How We Addressed
the Matter in Our
Audit
 We obtained an understanding, evaluated the design, and tested the operating effectiveness of controls related to the Company's revenue recognition process, including controls over management's estimates of total costs at completion for certain fixed-price contracts.

To test the completeness and accuracy of the Company's estimates of total costs at contract completion for certain fixed-price contracts where revenue is recognized under a cost-based input method, our audit procedures included, among others, comparing estimated costs to actual costs incurred to date, agreeing key terms to contract documentation, and obtaining an understanding of the Company's progress on the contract.

 /s/ Ernst & Young LLP

 We have served as the Company's auditor since 2020.

 Tysons, Virginia

 CONSOLIDATED BALANCE SHEETS
 (in millions, except per share data)

 ASSETS

 Current assets:

 Cash and cash equivalents
 $
 $

 2,479
 2,401

 Prepaid expenses and other current assets

 Total current assets
 3,113
 3,084

 Property and equipment, net

 Equity method investments

 5,703
 5,556

 Intangible assets, net
 1,955
 2,623

 Total assets
 $
 11,460
 $
 11,974

 LIABILITIES

 Current liabilities:

 Current portion of long-term debt
 $
 $

 Accounts payable

 Contract liabilities

 Total current liabilities
 2,354
 1,965

 Long-term debt, net of current portion
 3,901
 4,643

 Deferred tax liabilities

 Total liabilities
 6,840
 7,422

 Commitments and contingencies (Note 21)

 SHAREHOLDERS' EQUITY

 Common stock, $ 0.01 par value – 1,000,000,000 shares authorized and 243,464,776 shares issued and outstanding at October 3, 2025; 1,000,000,000 shares authorized and 243,302,173 shares issued and outstanding at September 27, 2024.

 Additional paid-in capital
 4,924
 4,962

 Retained deficit
 ( 461)
 ( 527)

 Accumulated other comprehensive income

 Total Amentum shareholders' equity
 4,505
 4,460

 Total shareholders' equity
 4,620
 4,552

 Total liabilities and shareholders' equity
 $
 11,460
 $
 11,974

 CONSOLIDATED STATEMENTS OF OPERATIONS
 (in millions, except per share data)

 $
 $
 8,388
 $
 7,865

 ( 12,880)
 ( 7,590)
 ( 7,083)

 Selling, general, and administrative expenses
 ( 616)
 ( 353)
 ( 297)

 Amortization of intangibles
 ( 479)
 ( 228)
 ( 298)

 Equity earnings of non-consolidated subsidiaries

 Goodwill impairment charges
 —
 —
 ( 186)

 Operating income

 Interest expense and other, net
 ( 353)
 ( 438)
 ( 397)

 Loss on extinguishment of debt
 ( 12)
 ( 45)
 —

 Gain on acquisition of controlling interest
 —
 —

 Income (loss) before income taxes
 ( 123)
 ( 340)

 (Provision) benefit for income taxes
 ( 56)

 ( 83)

 Less: net income attributable to non-controlling interests

 $
 $
 ( 82)
 $

 Earnings (loss) per share:

 Basic
 $
 0.27
 $
 ( 0.90)
 $
 ( 3.49)

 Diluted
 $
 0.27
 $
 ( 0.90)
 $
 ( 3.49)

 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
 (in millions)

 $
 $
 ( 83)
 $

 Other comprehensive income (loss):

 Net unrealized gain (loss) on interest rate swaps
 ( 47)

 Foreign currency translation adjustments

 Pension adjustments

 Other comprehensive income (loss)
 ( 30)

 Income tax (provision) benefit related to items of other comprehensive income (loss)
 ( 2)
 ( 13)

 Other comprehensive income (loss), net of tax
 ( 25)

 Comprehensive income (loss)
 ( 108)
 ( 282)

 Net income (loss) attributable to non-controlling interests

 Comprehensive income (loss) attributable to common shareholders
 $
 $
 ( 107)
 $
 ( 275)

 CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
 (in millions)

 Common Stock
 Additional Paid-in Capital
 Retained Deficit
 Accumulated Other Comprehensive Income (Loss)
 Total Shareholders' Equity Attributable to Amentum Holdings, Inc.
 Non-controlling
Interests
 Total Shareholders' Equity

 Shares
 Amount

 Balance at September 30, 2022
 —
 $
 —
 $
 $
 ( 131)
 $
 $
 $
 $

 Net loss including non-controlling interests
 —
 —
 —
 —
 ( 7)

 Other comprehensive loss, net of tax
 —
 —
 —
 —
 —

 Acquisition of remaining interest in consolidated joint ventures
 —
 —
 —
 —
 ( 14)
 —

 Capital contribution from non-controlling interest
 —
 —
 —
 —
 —
 —

 Distributions to non-controlling interests
 —
 —
 —
 —
 —
 —
 ( 24)
 ( 24)

 Stock-based compensation and other
 —
 —
 —
 —
 —

 Balance at September 29, 2023
 —
 $
 —
 $
 $
 ( 445)
 $
 $
 $
 $

 Net loss including non-controlling interests
 —
 —
 —
 ( 82)
 —
 ( 82)
 ( 1)
 ( 83)

 Other comprehensive loss, net of tax
 —
 —
 —
 —
 ( 25)
 ( 25)
 —
 ( 25)

 Acquisition of CMS
 3,935
 —
 —
 3,937
 4,000

 Capital contribution
 —
 —
 —
 —
 —

 Distributions to non-controlling interests
 —
 —
 —
 —
 —
 —
 ( 6)
 ( 6)

 Stock-based compensation and other
 —
 —
 —
 —
 ( 5)

 Balance at September 27, 2024
 $
 $
 4,962
 $
 ( 527)
 $
 $
 4,460
 $
 $
 4,552

 Net income including non-controlling interests
 —
 —
 —
 —
 ( 7)

 Other comprehensive income, net of tax
 —
 —
 —
 —
 —

 Measurement period adjustments
 —
 —
 ( 63)
 —
 —
 ( 63)

 Issuances of common stock
 —
 —
 —
 —
 —

 Capital contribution from non-controlling interest
 —
 —
 —
 —
 —
 —

 Distributions to non-controlling interests
 —
 —
 —
 —
 —
 —
 ( 35)
 ( 35)

 Stock-based compensation and other
 —
 —
 —
 —
 ( 2)

 Balance at October 3, 2025
 $
 $
 4,924
 $
 ( 461)
 $
 $
 4,505
 $
 $
 4,620

 CONSOLIDATED STATEMENTS OF CASH FLOWS
 (in millions)

 Cash flows from operating activities

 $
 $
 ( 83)
 $

 Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:

 Depreciation

 Amortization of intangibles

 Amortization of deferred loan costs and original issue discount

 Goodwill impairment charges
 —
 —

 Derivative instruments

 Equity earnings of non-consolidated subsidiaries
 ( 62)
 ( 74)
 ( 56)

 Distributions from equity method investments

 Deferred income taxes
 ( 47)
 ( 115)
 ( 62)

 Stock-based compensation

 Gain on acquisition of controlling interest
 —
 ( 69)
 —

 Other

 Changes in assets and liabilities, net of effects of business acquisition:

 ( 171)
 ( 68)

 Prepaid expenses and other assets

 Accounts payable, contract liabilities, and other current liabilities
 ( 211)
 ( 24)

 ( 82)

 ( 53)
 ( 6)

 Net cash provided by operating activities

 Cash flows from investing activities

 Acquisitions, net of cash acquired
 ( 70)
 —

 Divestitures, net of cash conveyed
 —
 —

 Purchase of property and equipment
 ( 27)
 ( 11)
 ( 12)

 Contributions to equity method investments
 ( 56)
 ( 1)
 ( 17)

 Return of capital from equity method investments
 —

 Other
 ( 3)
 ( 1)
 ( 2)

 Net cash provided by (used in) investing activities
 ( 17)

 Cash flows from financing activities

 Borrowings on revolving credit facilities
 1,146
 1,201

 Payments on revolving credit facilities
 ( 1,146)
 ( 562)
 ( 1,201)

 Proceeds from borrowing under the term loans
 —
 2,620
 —

 Repayments of borrowings under the credit agreement
 ( 750)
 ( 4,177)
 ( 34)

 Proceeds from issuance of Senior Notes
 —
 1,000
 —

 Payments of debt issuance fees
 —
 ( 38)
 —

 Repayments of borrowings under other agreements
 ( 9)
 ( 13)
 ( 67)

 Capital contribution
 —
 —

 Capital contribution from non-controlling interests
 —

 Distributions to non-controlling interests
 ( 35)
 ( 6)
 ( 24)

 Other
 ( 3)
 —

 Net cash used in financing activities
 ( 790)
 ( 382)
 ( 112)

 Effect of exchange rate changes on cash

 Net change in cash and cash equivalents
 ( 15)
 ( 61)

 Cash and cash equivalents, beginning of period

 Cash and cash equivalents, end of period
 $
 $
 $

 Supplemental disclosure of cash flow information

 Common stock issued for the Transaction
 $
 ( 63)
 $
 3,937
 $
 —

 Income taxes paid, net of receipts
 $
 ( 107)
 $
 ( 95)
 $
 ( 26)

 Interest paid
 $
 ( 306)
 $
 ( 373)
 $
 ( 362)

 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

 Note 1 — Organization and Description of Business
 Amentum Holdings, Inc. (collectively with its subsidiaries, "we," "us," "our," "Amentum," or the "Company") is a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, and customers in international and commercial markets, supporting programs of critical national importance across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We offer a broad reach of capabilities including energy, environmental remediation, intelligence and counter threat solutions, data fusion and analytics, engineering and integration, advanced test, training and readiness, and citizen solutions. As a leading provider of differentiated technology solutions, we have built a repertoire of deep customer knowledge, enabling us to engage our customers across multiple capabilities and markets.
 On September 27, 2024, the spin-off of the Jacobs Solutions Inc. ("Jacobs") Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (and, together with the Critical Mission Solutions business, referred to as "CMS") merged with Amentum Parent Holdings LLC (collectively, the "Transaction") with the surviving entity renamed Amentum Holdings, Inc. We conduct our business activities and report financial results as two reportable segments: Digital Solutions and Global Engineering Solutions. The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients. The Global Engineering Solutions segment provides large-scale environmental remediation, nuclear power solutions, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations.
 Amentum's Registration Statement on Form 10 (the "Registration Statement"), filed with the Securities and Exchange Commission ("SEC") on July 15, 2024, was declared effective on September 18, 2024. Amentum Parent Holdings LLC is the accounting acquirer of CMS for accounting purposes in accordance with accounting principles generally accepted in the United States of America ("GAAP"). Amentum Parent Holdings LLC is considered the Company's predecessor and the historical financial statements of Amentum Parent Holdings LLC prior to September 27, 2024, are reflected in this Annual Report on Form 10-K as the Company's historical financial statements. Accordingly, the financial results of the Company prior to September 27, 2024 do not include the financial results of CMS and current and future results will not be comparable to historical results.

 Note 2 — Summary of Significant Accounting Policies
 Reporting Periods
 Amentum's fiscal year ends on the Friday nearest the end of September. Fiscal year 2025 ended on October 3, 2025 and included 53 weeks, with the 53rd week falling in the fourth fiscal quarter. Fiscal year 2024 and fiscal year 2023 ended on September 27, 2024 and September 29, 2023, respectively, and both included 52 weeks.
 Principles of Consolidation and Basis of Presentation
 The accompanying consolidated financial statements have been prepared in accordance with GAAP.
 The consolidated balance sheets as of October 3, 2025 and September 27, 2024 are for Amentum Holdings, Inc. and include CMS, which was acquired by the Company on September 27, 2024.
 The consolidated statement of operations and statement of cash flows for the year ended October 3, 2025 are for Amentum Holdings, Inc. and include CMS activity. The consolidated statement of operations and statement of cash flows for the years ended September 27, 2024 and September 29, 2023 do not include CMS activity due to the Transaction closing on September 27, 2024.
 The consolidated financial statements include the accounts of the Company's wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company has investments in joint ventures that are variable interest entities ("VIEs"). The VIEs are accounted for in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 810, Consolidation. In cases where the Company has (i) the power to direct the activities of the VIE that most significantly impact its economic performance and (ii) the obligation to absorb losses of the VIE that could potentially be significant or the right to receive benefits from the entity that could potentially be significant to the VIE, the Company consolidates the entity. When the Company consolidates an entity that is not wholly-owned, the Company reports the minority interests in the entity as non-controlling interests in the equity section of the consolidated balance sheets. The Company has included the non-controlling interest in earnings of the entities within the consolidated net loss including non-controlling interests and deducted the same amount to derive net loss attributable to

 common shareholders. Alternatively, in cases where all of the aforementioned criteria are not met, the investment is accounted for under the equity method.
 Use of Estimates
 The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amount of revenues and expenses. The most significant estimates relate to estimating contract revenues and costs at completion, fair value measurements, fair value of goodwill and intangible assets, valuation allowances, and reserves for contract-related matters and contingencies. Due to the size and nature of many of our contracts, the estimation of total revenues and cost at completion is subject to a wide range of variables. Actual results may differ from these estimates.
 Revenue Recognition
 The Company generates revenue from service arrangements primarily with the U.S. government, including subcontracts with other contractors performing work for the U.S. government. The Company also serves state, local and foreign governments and commercial customers. Our services are generally performed under cost-plus-fee, fixed-price, or time-and-materials contracts which typically involve an annual base period of performance followed by renewal option periods that, once exercised, are generally accounted for as separate contracts.
 We account for a contract when the parties have approved the contract and are committed to perform their respective obligations, the rights of each party and the payment terms are identified, the contract has commercial substance, and collectability is probable.
 To determine the proper revenue recognition, we assess whether the distinct goods or services to be provided are to be accounted for as a single performance obligation or as multiple performance obligations. The majority of our contracts have a single performance obligation as the promise to transfer the respective goods or services is not separately identifiable from other promises in the contract and is therefore not distinct.
 We also evaluate whether modifications to existing contracts should be accounted for as part of the original contract or as a separate contract. Contract modifications that do not add distinct goods or services are accounted for through cumulative catch-up adjustments. Contract modifications that add distinct goods or services and increase the contract value by an amount that reflects the standalone selling price are accounted for as separate contracts.
 The transaction price is the estimated amount of fixed and variable consideration we expect to receive for performance of our contracts. Variable consideration is typically in the form of award or incentive fees or a combination thereof. Variable consideration is generally based upon various objective and subjective criteria, such as meeting performance or cost targets. These estimates are based on historical award experience, anticipated performance and our best judgment based on current facts and circumstances. Management continuously monitors these factors that may affect the quality of its estimates, and material changes in estimates are disclosed accordingly. Variable consideration is included in the estimated transaction price, to the extent that it is probable that a significant reversal of cumulative revenues recognized will not occur, and there is a basis to reasonably estimate the amount of variable consideration.
 The Company generally recognizes revenues over time throughout the contract performance period as control is transferred continuously to our customers as work progresses. We measure our progress towards completion using an input measure of total costs incurred divided by total costs expected to be incurred.
 Revenues on cost-plus-fee contracts are recorded as contract allowable costs are incurred and fees are earned. Revenues are recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations.
 Revenues on fixed-price contracts are recorded as work is performed over the period of performance. Revenues are recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations. Incurred cost represents work performed, which corresponds with the transfer of control to the customer. For such contracts, we estimate total costs at the inception of the contract based on our assumptions of the cost elements required to complete the associated tasks of the contract and assess the impact of the risks on our estimates of total costs to complete the contract. Our cost estimates are based on assumptions that include our employee labor costs, the cost of materials, and the performance of our subcontractors. These cost estimates are subject to change as we perform under the contract and as a result, the timing of revenues and amount of profit on a contract may change as there are changes in estimated costs to complete the contract. Such adjustments are recognized on a cumulative catch-up basis in the period we identify the changes. If total expected costs exceed total estimated contract revenues, a provision for the entire expected loss on the contract is recorded in the period in which the loss is identified. Total estimated losses are inclusive of any unexercised options that are probable of award, only if they increase the amount of the loss.

 Revenues for time-and-materials contracts are recorded based on the amount for which we have the right to invoice our customers, because the amount directly reflects the value of our work performed for the customer. Revenues are recorded on the basis of contract allowable labor hours worked multiplied by the contract defined billing rates, plus the direct costs and indirect cost burdens associated with materials and subcontract work used in performance on the contract. Generally, profits on time-and-materials contracts result from the difference between the cost of services performed and the contractually defined billing rates for these services.
 Changes in Estimates on Contracts
 The Company recognizes revenues on performance obligations using a cost-to-cost input method based on the ratio of costs incurred to date to total estimated costs at completion. Changes in estimates of revenues and costs of revenues related to performance obligations satisfied over time are recognized in the period in which the changes are made for the inception-to-date effect of the changes. The Company uses professional judgment when assessing risks, estimating contract revenues and costs, estimating variable consideration, and making assumptions for schedule and technical issues. The Company periodically reassesses its assumptions and estimates as needed. When estimates of total costs to be incurred on a contract exceed total revenues, a provision for the entire loss on the contract is recorded in the period in which the loss is determined. Total estimated losses are inclusive of any unexercised contract options that are probable of award.
 Cost of Revenues
 Cost of revenues includes all direct contract costs such as labor, materials, and subcontractor costs, allocations of indirect costs, and depreciation expense related to property and equipment directly attributable to contracts.
 Selling, General, and Administrative Expenses
 Selling, general, and administrative expenses include indirect costs that are allowable and allocable to contracts under federal procurement standards. Selling, general, and administrative expenses also include expenses that are unallowable under applicable procurement standards and are not allocable to contracts for billing purposes. Such unallowable expenses do not directly generate revenues but are necessary for business operations.
 Cash and Cash Equivalents
 The Company considers cash on deposit and all highly liquid investments with original maturities of three months or fewer at the date of purchase to be cash and cash equivalents.
 Accounts Receivable
 Accounts receivable include billed and billable receivables, and unbilled receivables. Billed and billable receivables represent amounts in which the right to consideration is unconditional other than the passage of time. The Company records its billed and billable receivables net of an allowance for expected credit losses. Upon determination that a specific receivable is uncollectible, the receivable is written off against the allowance for expected credit losses.
 Contract Assets
 Contract assets represent unbilled receivables in which our right to consideration is conditional upon factors other than the passage of time. Contract assets exclude billed and billable receivables. Contract assets consist of costs and fees that are billable on contract completion or billable upon other specified events, such as the completion of a milestone, retention of fees until contract completion, or resolution of a formal claim.
 Accounting for Sales of Accounts Receivable
 The Company considers accounts receivable transfers under its Master Accounts Receivable Purchase Agreement ("MARPA") as sales under ASC 860, Transfers and Servicing, and derecognizes the sold accounts receivable from its balance sheet. The fair value of the sold accounts receivable approximated their book value due to their short-term nature.
 Contract Liabilities
 Contract liabilities represent advanced payments received from a customer and billings in excess of revenues recognized as of the balance sheet date. These amounts are subsequently recognized into revenues as the performance obligation is satisfied.
 Property and Equipment
 Property and equipment are recorded at cost and are depreciated over their estimated useful lives using the straight-line method. We review the carrying amounts of long-lived assets for impairment whenever there is evidence that events or changes in circumstances indicate that the carrying value may not be recoverable and the carrying amount of the asset exceeds its estimated fair value.
 Leases

 The Company enters into contractual arrangements primarily for the use of real estate facilities, information technology equipment, vehicles, and certain other equipment. These arrangements contain a lease when the Company controls the underlying asset and has the right to obtain substantially all of the economic benefits or outputs from the asset. We have short-term leases, operating leases, and finance leases.
 The Company accounts for leases in accordance with principles contained in ASC 842, Leases. The Company categorizes leases with contractual terms longer than twelve months as either operating or finance leases. Finance leases are generally those leases that allow us to substantially utilize or pay for the entire asset over its estimated life. Assets acquired under finance leases are recorded in property and equipment, net. Finance lease assets are amortized within cost of revenues on a straight-line basis over the shorter of the estimated useful lives of the assets or, in the instance where title does not transfer at the end of the lease term, the lease term. The interest component of a finance lease is included in interest expense and other, net and recognized using the effective interest method over the lease term.
 The Company records a right-of-use asset and lease liability as of the lease commencement date equal to the present value of the remaining lease payments for its operating and finance leases. Most of our leases do not provide an implicit rate that can be readily determined. Therefore, we use a discount rate based on the Company's incremental borrowing rate, which is determined using our credit rating and information available as of the commencement date. The right-of-use asset is then adjusted for initial direct costs and certain lease incentives included in the contractual arrangement.
 The Company has elected the practical expedient to apply the lease recognition guidance for short-term leases defined as twelve months or fewer. Our operating lease arrangements may contain options to extend the lease term or for early termination. We account for these options when it is reasonably certain we will exercise them. Right-of-use assets are evaluated for impairment in a manner consistent with the treatment of other long-lived assets. Operating lease expense is recognized on a straight-line basis over the lease term and is recorded within cost of revenues or selling, general, and administrative expenses on the consolidated statements of operations.
 Business Combinations
 The Company records all tangible and intangible assets acquired and liabilities assumed in a business combination at fair value as of the acquisition date, with any excess purchase consideration recorded as goodwill. Determining the fair value of acquired intangible assets requires management to make significant judgments about expected future cash flows, weighted-average cost of capital, discount rates, useful lives of assets and expected long-term growth rates. During the measurement period, not to exceed one year from the acquisition date, the Company may adjust provisional amounts recorded to reflect new information subsequently obtained regarding facts and circumstances that existed as of the acquisition date.
 Intangible Assets
 The Company primarily amortizes intangible assets using an accelerated method which best approximates the proportion of the future cash flows estimated to be generated in each period over the estimated useful life of the applicable asset and evaluated on an annual basis to ensure continued appropriateness unless their estimated useful lives are determined to be indefinite or the estimated cash flows indicate another pattern of amortization should be used.
 Goodwill represents the excess of amounts paid over the estimated fair value of net assets acquired from an acquisition. The Company evaluates goodwill for impairment annually on the first day of the fourth quarter of the fiscal year or whenever events or circumstances indicate that the carrying value may not be recoverable.
 The evaluation includes a qualitative or quantitative assessment that compares the estimated fair value of the relevant reporting unit to its respective carrying value, including goodwill, and utilizes both market and income approaches, which are Level 2 and Level 3 inputs, respectively. The market approach utilizes observable Level 2 inputs as it considered the inputs of other comparable companies. The income approach utilizes unobservable inputs and management judgment which are Level 3 fair value measurements. The analysis utilizes judgments and assumptions about expected growth rates, terminal earnings before interest, taxes, depreciation and amortization ("EBITDA") margins, discount rates based on weighted-average cost of capital, assumptions regarding future capital expenditures and observable inputs of other comparable companies. The fair value of each reporting unit is compared to the carrying amount of the reporting unit and if the carrying amount of the reporting unit exceeds the fair value, then an impairment loss is recognized for the difference.
 Commitments and Contingencies
 Accruals for commitments and loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated.
 Defined Benefit Pension Plans

 Accounting and reporting for the Company's defined benefit pension plans require the use of assumptions, including but not limited to, a discount rate and an expected return on assets. We base the discount rate on a yield curve developed from corporate bonds rated AA or better with maturities consistent with our projected defined benefit plan cash flows. We evaluate the discount rate and related assumptions at least annually based on reviews of current plan information and consultation with the Company's independent actuary and the plans' investment advisor. If these assumptions differ materially from actual results, the Company's obligations under the defined benefit pension plans could also differ materially, potentially requiring the Company to record an additional liability. The Company's defined benefit pension plan liabilities are developed from actuarial valuations, which are performed each year.
 Income Taxes
 The Company provides for income taxes in accordance with principles contained in ASC 740, Income Taxes. Under these principles, income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Any interest or penalties incurred in connection with income taxes are recorded as part of the provision for income taxes for financial reporting purposes. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.
 The Company also evaluates any uncertain tax positions and recognizes a liability for the tax benefit associated with an uncertain tax position if it is more likely than not that the tax position will not be sustained on examination by the taxing authorities upon consideration of the technical merits of the position. The tax benefits recognized in the financial statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. Any change in judgment related to the expected ultimate resolution of uncertain tax positions is recognized in the period in which such change occurs. The Company recognizes interest and penalties related to uncertain tax positions within benefit (provision) for income taxes in the consolidated statement of operations.
 Interest Rate Swap Agreements
 We enter into interest rate swap agreements in order to hedge the variability of expected future cash interest payments. We designate our derivative instruments as cash flow hedges if they meet the criteria specified in ASC 815, Derivatives and Hedging. Changes in the fair value of derivatives designated and qualifying as cash flow hedges are deferred in accumulated other comprehensive income and are recognized into earnings as the hedged transactions affect earnings. Changes in the fair value of derivatives not designated and qualifying as cash flow hedges are immediately recognized in earnings and classified as interest expense.
 Fair Value of Financial Instruments
 The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, and amounts included in other current assets and current liabilities that meet the definition of a financial instrument approximate fair value because of the short-term nature of these amounts. The fair value of our debt approximates its carrying value. The fair value of our debt was estimated using Level 2 inputs based on our recently priced debt.
 Earnings (Loss) Per Share
 Basic earnings (loss) per share is computed by dividing net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Due to the loss experienced by the Company in fiscal year 2024, the computation of diluted loss per share does not assume the impact of restricted stock units that would have an antidilutive effect on loss per share. Information about the weighted-average number of basic and diluted shares is presented in "Note 20 — Earnings (Loss) Per Share".
 Concentrations of Credit Risk
 Financial instruments that potentially subject the Company to credit risk include receivables and cash equivalents. Receivables credit risk is also limited due to the credit worthiness of the U.S. Government. Management believes the credit risk associated with the Company's cash equivalents is limited due to the credit worthiness of the obligors of the investments underlying the cash equivalents. In addition, although the Company maintains cash balances at financial institutions that exceed federally insured limits, these balances are placed with high quality financial institutions. Approximately 81 %, 90 % and 91 % of the Company's revenues were derived through direct contracts with agencies of the U.S. Government for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively.
 Foreign Currency Translation

 The Company's functional currency is generally the United States dollar except for foreign operations where the functional currency is generally the local currency. Results of operations for foreign entities are translated to U.S. dollars using the average exchange rates during the period. Assets and liabilities for foreign entities are translated using the exchange rates in effect as of the date of the balance sheet. Resulting translation adjustments are recorded as a foreign currency translation adjustment into other accumulated comprehensive income in shareholders' equity.
 Comprehensive Income (Loss)
 Comprehensive income (loss) is the change in equity of a business enterprise during a period from transactions and other events and circumstances from nonowner sources. Other comprehensive income (loss) refers to revenues, expenses, and gains and losses that under GAAP are included in comprehensive income (loss), but excluded from the determination of net income (loss) including non-controlling interests. The elements within other comprehensive income (loss) consist of foreign currency translation adjustments, differences between actual amounts and estimates based on actuarial assumptions and the effect of changes in actuarial assumptions made under the Company's pension plans and the changes in the fair value of interest rate swap agreements. The Company accounts for the residual income tax effects in comprehensive income (loss) using the portfolio method and will release the residual tax effect when the entire portfolio of the applicable balance is terminated.

 Note 3 — Recent Accounting Pronouncements
 Accounting Standards Updates Issued but Not Yet Adopted
 In December 2023, the FASB issued Accounting Standards Update ("ASU") No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and usefulness of income tax disclosures. This update requires disaggregated information about an entity's effective tax rate reconciliation as well as information on income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024, and may be applied on a prospective or retrospective basis. We plan to adopt ASU 2023-09 using the prospective approach in fiscal year 2026.
 In November 2024, the FASB issued ASU No. 2024-03, Disaggregation of Income Statement Expenses, to enhance the transparency of certain expense disclosures. The update requires disclosure of specific types of expenses included in certain expense captions presented on the face of the consolidated statements of operations. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim reporting periods beginning after December 15, 2027, and may be applied on a prospective or retrospective basis. Early adoption is permitted. We are currently evaluating the impacts of the new standard on our financial statements.
 Accounting Standards Updates Adopted
 In November 2023, the Financial Accounting Standards Board ("FASB") issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements. This update requires disclosure of significant segment expenses and other segment items in annual and interim periods. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The amendment requires retrospective application to all prior periods presented in the financial statements and early adoption is permitted. We adopted the annual disclosure requirements in fiscal year 2025 and will adopt the interim disclosure requirements in the first quarter of fiscal year 2026. See Note 18 — Segment Information for additional information.

 Note 4 — Acquisition and Divestiture
 Acquisition of CMS
 On September 27, 2024, Amentum Parent Holdings LLC completed its merger with CMS, a leading provider of mission-critical, technology-driven services in government and commercial markets, in a Reverse Morris Trust transaction.
 Amentum Parent Holdings LLC was the accounting acquirer of CMS. Immediately following the Transaction, the Company had approximately 243 million issued and outstanding shares of common stock, of which Jacobs and its shareholders ("CMS Shareholders") owned 58.5 % of the issued and outstanding shares of common stock, and Amentum Joint Venture LP, our previous parent company ("AJVLP" and "Amentum Equityholder") owns 37.0 %. Subsequently, Amentum Equityholder distributed its shares of our common stock to certain parties (collectively, "Sponsor Stockholder"). Further, 4.5 % of the issued and outstanding shares of common stock was placed in escrow at the merger date, to be released and delivered in the future to CMS Shareholders or to Amentum Equityholder, depending on the achievement of certain fiscal year 2024 targets by CMS ("Additional Merger Consideration"). In March 2025, the Company and Jacobs finalized the Additional Merger Consideration and released all 4.5 % of the issued and outstanding shares of common stock out of escrow with 3.5 % of the issued and outstanding shares released to CMS Shareholders and the remaining 1.0 % of issued and outstanding shares to the Sponsor Stockholder. Additionally, in connection and in accordance with the terms of the Transaction, prior to the spin-off and Transaction, CMS provided a cash payment to Jacobs of approximately $ 911 million, after adjustments based on the levels of cash, debt and working capital in CMS.

 Under the acquisition method of accounting, the total final consideration exchanged for the CMS transaction is shown below and increased $ 7 million from September 27, 2024:

 (In millions, except per share amounts)

 Shares of Amentum Holdings, Inc. common stock issued to CMS shareholders

 Per share price of Amentum Holdings, Inc. common stock
 25.67

 Fair value of common stock issued to CMS shareholders (1)

 3,654

 Fair value of additional equity consideration issued to CMS shareholders (2)

 Final working capital settlement (3)

 Other consideration (4)

 Fair value of consideration transferred
 3,948

 Fair value of previously held equity interest (5)

 Total consideration
 $
 4,032

 (1) Represents the fair value of equity consideration received by CMS shareholders to provide 58.5 % ownership in the Company.
 (2) Represents the additional equity consideration which was finalized in March 2025. The balance reflects a decrease in equity consideration issued to CMS Shareholders following a resolution to release an additional 1.0 % of the issued and outstanding shares of Amentum common stock back to Sponsor Stockholder. This balance is presented at fair value based on the acquisition-date share price and is included in the total purchase consideration in accordance with ASC 805.
 (3) Reflects a $ 70 million cash payment made based on the final net working capital position. This payment was made in the third quarter of fiscal year 2025 and included in the total purchase consideration in accordance with ASC 805, as it represents an obligation attributable to pre-acquisition activities.
 (4) Represents other immaterial adjustments, including a) estimated equity consideration related to pre-combination stock-based compensation awards, b) the settlement of CMS transaction costs paid by Amentum, and c) the removal of consideration related to the acquisition of non-controlling interests.
 (5) Prior to the Transaction, we held a non-controlling interest in a joint venture of 50 % which was accounted for under the equity method of accounting, with the remaining 40 % held by CMS and 10 % held by an unrelated third party. As a result of the Transaction, the Company gained a controlling financial interest in the joint venture and it became a consolidated joint venture of the Company. This joint venture acquisition was accounted for as a business combination achieved in stages. Our pre-existing equity method investment in the joint venture was remeasured at an acquisition date fair value of $ 170 million by using a discounted cash flow model based on estimated future revenues, margins and discount rates, among other variables and estimates. The Company's previously held equity interest in the joint venture was remeasured to fair value, resulting in a gain of $ 69 million recognized in the year ended September 27, 2024, which is included in gain on acquisition of controlling interest in our consolidated statements of operations. Additionally, as of the acquisition date, the Company had a payable from the joint venture with a fair value of $ 1 million that was settled in connection with the acquisition.
 The Company recognized $ 79 million of transaction costs for the year ended September 27, 2024, of which $ 31 million relates to debt issuance costs that were incurred immediately following the transaction and are expensed and presented in loss on extinguishment of debt in the consolidated statements of operations. The remaining $ 48 million of transaction costs are presented within selling, general, and administrative expenses in the consolidated statements of operations.
 The Transaction was accounted for as a business combination. The Company assessed the fair value of the identifiable intangible assets including customer relationships and backlog, which were valued using the excess earnings method of the income approach. This method requires several judgments and assumptions to determine the fair value of the intangible assets including expected future cash flows, weighted-average cost of capital, discount rates, useful lives of assets and expected long-term growth rates. The purchase price has been allocated to the tangible and intangible assets acquired and liabilities assumed based on their fair values as of the acquisition date, with the excess purchase consideration recorded as goodwill. The preliminary fair value estimates and assumptions to measure the assets acquired and liabilities assumed were subject to change as the Company obtained additional information during the measurement period. The Company finalized the allocation of the purchase price for the Transaction based on its understanding of the estimated fair value of the acquired assets and assumed liabilities as of the acquisition date, with the excess purchase consideration recorded as goodwill. The goodwill recognized was attributable to the synergies expected to be achieved by combining the businesses of Amentum and CMS, expected future contracts and the acquired workforce. Of the value attributed to goodwill and intangible assets, $ 737 million is deductible for income tax purposes. The Company completed the accounting for the merger during the fiscal year ended October 3, 2025.
 The final allocation of the purchase price is as follows:

 Preliminary Allocation of Purchase Price
 Measurement Period Adjustments, Net
 Final Allocation of Purchase Price

 Cash and cash equivalents
 $
 $
 —
 $

 Accounts receivable
 1,043
 ( 64)

 Prepaid expenses and other current assets
 ( 34)

 Property and equipment
 ( 3)

 Equity method investments

 2,665
 3,004

 Intangible assets
 1,860
 ( 55)
 1,805

 Current portion of long-term debt
 ( 8)
 —
 ( 8)

 Accounts payable
 ( 257)
 ( 3)
 ( 260)

 ( 285)
 ( 263)

 Contract liabilities
 ( 48)
 ( 49)
 ( 97)

 ( 98)
 ( 190)
 ( 288)

 Long-term debt, net of current portion
 ( 1,122)
 —
 ( 1,122)

 Deferred tax liabilities
 ( 353)
 ( 292)

 ( 75)
 ( 40)
 ( 115)

 ( 63)
 ( 64)
 ( 127)

 Total consideration
 $
 4,025
 $
 $
 4,032

 The fair value of acquired backlog of $ 275 million was amortized on an accelerated basis over approximately 1 year and the fair value of customer relationship intangible assets of $ 1,530 million is amortized on an accelerated basis over approximately 14 years. The fair value attributed to these intangible assets acquired was based on assumptions and other information compiled by management, including independent valuations that utilized established valuation techniques, and thus represents a Level 3 fair value measurement. The income approach was primarily used to value the intangible assets, consisting primarily of acquired program and contract intangibles and backlog. The income approach indicates value for an asset based on the present value of cash flow projected to be generated by the asset. Projected cash flow is discounted at a rate of return that reflects the relative risk of achieving the cash flow and the time value of money.
 Unaudited Pro Forma Combined Financial Information
 The following unaudited pro forma combined financial information presents the combined results of operations for CMS and the Company for the pre-acquisition periods of the twelve months ended September 27, 2024 and September 29, 2023, respectively:

 $
 13,858
 $
 13,371

 ( 170)

 The unaudited pro forma combined financial information presented above has been prepared from historical financial statements that have been adjusted to give effect to the Transaction as though it had occurred on October 1, 2022. The unaudited pro forma combined financial information includes adjustments for intangible asset amortization, stock-based compensation, interest expense, policy adjustments, and other transaction costs. The unaudited pro forma combined financial information is not intended to reflect the actual results of operations that would have occurred if the acquisition had occurred on October 1, 2022 nor is it indicative of future operating results.
 Divestiture of Rapid Solutions
 On June 26, 2025, we completed the sale of a hardware and product business, Rapid Solutions, to Lockheed Martin Corporation for a purchase price of $ 360 million in cash. Rapid Solutions was part of the DS segment.

 Note 5 — Revenues
 Disaggregation of Revenues

 The Company disaggregates revenues by customer, contract type, prime contractor versus subcontractor, geographic location and whether the solution provided is primarily Digital Solutions or Global Engineering Solutions. These categories represent how the nature, amount, timing, and uncertainty of revenues and cash flows are affected.
 Disaggregated revenues by customer-type were as follows:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 Department of War and U.S. Intelligence Community
 $
 3,222
 $
 4,456
 $
 7,678
 $
 1,509
 $
 4,094
 $
 5,603
 $
 1,474
 $
 3,791
 $
 5,265

 Other U.S. Government Agencies
 1,607
 2,387
 3,994
 1,598
 1,984
 1,526
 1,867

 Commercial and International
 2,007
 2,721

 Total revenues
 $
 5,543
 $
 8,850
 $
 $
 1,981
 $
 6,407
 $
 8,388
 $
 1,899
 $
 5,966
 $
 7,865

 Disaggregated revenues by contract-type were as follows:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 Cost-plus-fee
 $
 3,557
 $
 5,426
 $
 8,983
 $
 $
 4,234
 $
 5,198
 $
 $
 4,066
 $
 4,941

 Fixed-price
 1,422
 2,067
 3,489
 1,576
 2,226
 1,422
 2,089

 Time-and-materials
 1,357
 1,921

 Total revenues
 $
 5,543
 $
 8,850
 $
 $
 1,981
 $
 6,407
 $
 8,388
 $
 1,899
 $
 5,966
 $
 7,865

 Disaggregated revenues by prime contractor versus subcontractor were as follows:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 Prime contractor
 $
 5,069
 $
 8,027
 $
 13,096
 $
 1,772
 $
 5,738
 $
 7,510
 $
 1,722
 $
 5,236
 $
 6,958

 Subcontractor
 1,297

 Total revenues
 $
 5,543
 $
 8,850
 $
 $
 1,981
 $
 6,407
 $
 8,388
 $
 1,899
 $
 5,966
 $
 7,865

 Revenues by geographic location are reported by the country in which the work is performed and were as follows:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 United States
 $
 5,304
 $
 5,442
 $
 10,746
 $
 1,679
 $
 4,376
 $
 6,055
 $
 1,544
 $
 4,204
 $
 5,748

 International
 3,408
 3,647
 2,031
 2,333
 1,762
 2,117

 Total revenues
 $
 5,543
 $
 8,850
 $
 $
 1,981
 $
 6,407
 $
 8,388
 $
 1,899
 $
 5,966
 $
 7,865

 Changes in Estimates on Contracts
 Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:

 Favorable earnings at completion adjustments
 $
 $
 $

 Unfavorable earnings at completion adjustments
 ( 67)
 ( 38)
 ( 46)

 Net favorable adjustments
 $
 $
 $

 Impact on diluted earnings (loss) per share attributable to common shareholders (1)

 $
 0.19
 $
 0.40
 $
 0.37

 (1) The impact on diluted earnings (loss) per share attributable to common shareholders is calculated using our statutory rate.
 Remaining Performance Obligations
 The Company's remaining performance obligations balance represents the expected revenues to be recognized for the satisfaction of remaining performance obligations on existing contracts. This balance excludes unexercised contract option years and task orders that may be issued as part of an indefinite delivery, indefinite quantity contract. The remaining performance obligations balance as of October 3, 2025 and September 27, 2024 was $ 9.9 billion and $ 12.9 billion, respectively.
 As of October 3, 2025, the Company expects to recognize approximately 77 % and 90 % of the remaining performance obligations balance as revenues over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.

 Note 6 — Contract Balances
 The Company's contract balances consisted of the following (in millions):

 As of

 Description of Contract Related Balance
 Classification

 Billed and billable receivables
 $
 1,514
 $
 1,378

 Contract assets

 Related party receivables

 Long-term contract assets

 Related party contract liabilities - deferred revenues and other contract liabilities
 Contract liabilities
 ( 15)
 —

 Contract liabilities - deferred revenues and other contract liabilities
 Contract liabilities
 ( 212)
 ( 113)

 Contract assets primarily relate to accruals for reimbursable costs and fees in which our right to consideration is conditional. Long-term contract assets relate to a prior acquisition.
 The Company recognized revenues of $ 95 million and $ 98 million during the years ended October 3, 2025 and September 27, 2024, respectively, that was included in Contract liabilities as of September 27, 2024 and September 29, 2023, respectively.

 Note 7 — Sales of Receivables
 In March 2024, we entered into a Master Accounts Receivable Purchase Agreement ("MARPA") with MUFG Bank, Ltd., (the "Purchaser") for the sale of certain designated eligible U.S. Government receivables. In December 2024, we amended the MARPA with the Purchaser to increase the maximum amount of eligible receivables that can be sold up to a maximum amount of $ 400 million. Under the MARPA, the Company can sell certain eligible receivables without recourse for any U.S. Government credit risk.
 The Company does not retain an ongoing financial interest in the transferred receivables other than cash collection and administrative services. The Company estimated that its servicing fee was at fair value and therefore no servicing asset or liability related to these receivables was recognized as of October 3, 2025. Proceeds from the sold receivables are reflected in operating cash flows on the statement of cash flows.

 The Company's MARPA activity consisted of the following:

 As of and for the Year Ended

 Beginning balance:
 $
 $
 —

 Sales of receivables
 3,807
 1,574

 Cash collections
 ( 3,804)
 ( 1,397)

 Outstanding balance sold to Purchaser (1)

 Cash collected, not remitted to Purchaser (2)

 ( 49)
 ( 39)

 Remaining sold receivables
 $
 $

 (1) For the years ended October 3, 2025 and September 27, 2024, the Company recorded a net cash inflow of $ 3 million and $ 177 million in its cash flows from operating activities, respectively, from sold receivables. MARPA cash flows are calculated as the change in the outstanding balance during the fiscal year.
 (2) Includes the cash collected on behalf of but not yet remitted to the Purchaser as of October 3, 2025 and September 27, 2024. This balance is included in Other current liabilities as of the balance sheet date.

 Note 8 — Goodwill and Intangible Assets
 The table below presents changes in the carrying amount of goodwill by reportable segment for the periods presented:

 DS
 GES
 Total

 Balance as of September 29, 2023
 $
 1,256
 $
 1,635
 $
 2,891

 Acquisition of CMS
 1,156
 1,509
 2,665

 Balance as of September 27, 2024
 2,412
 3,144
 5,556

 Measurement period adjustments (1)

 Divestitures
 ( 193)
 —
 ( 193)

 Foreign currency translation
 —

 Balance as of October 3, 2025
 $
 2,260
 $
 3,443
 $
 5,703

 (1) Represents changes to goodwill resulting from measurement period adjustments recorded in fiscal year 2025 associated with the acquisition of CMS purchase price allocation.
 During the first quarter of fiscal year 2025, we performed an interim goodwill impairment test both before and after we amended our organizational structure. In the fourth quarter of fiscal year 2025, we performed our annual goodwill impairment test. We concluded no impairment charges were necessary as a result of either test.
 During the first quarter of fiscal year 2023, we performed an interim goodwill impairment test both before and after we amended our organizational structure. Our interim quantitative goodwill impairment test concluded that the carrying value of one reporting unit exceeded its fair value. As a result, a non-cash impairment charge of $ 186 million was recognized during the year ended September 29, 2023.
 Accumulated goodwill impairment was $ 294 million as of both October 3, 2025 and September 27, 2024.
 Intangible Assets
 Intangible assets, net consisted of the following:

 As of October 3, 2025

 (Amounts in millions, except years)
 Weighted
Average
Useful Life
(Years)
 Gross
Carrying
Value
 Accumulated
Amortization
 Net

 Backlog
 5.1
 $
 $
 ( 586)
 $

 Customer relationship intangible assets
 11.1
 2,587
 ( 721)
 1,866

 Capitalized software
 4.6
 ( 13)

 Total intangible assets, net
 $
 3,275
 $
 ( 1,320)
 $
 1,955

 As of September 27, 2024

 (Amounts in millions, except years)
 Weighted
Average
Useful Life
(Years)
 Gross
Carrying
Value
 Accumulated
Amortization
 Net

 Backlog
 2.4
 $
 $
 ( 552)
 $

 Customer relationship intangible assets
 12.9
 2,781
 ( 550)
 2,231

 Capitalized software
 4.8
 ( 10)

 Total intangible assets, net
 $
 3,735
 $
 ( 1,112)
 $
 2,623

 Amortization expense was $ 479 million, $ 228 million and $ 298 million for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively.
 Future amortization expense is expected to be as follows:

 Year Ending September 30,

 2026
 $

 2027

 2028

 2029

 2030

 Thereafter

 Total
 $
 1,955

 Note 9 — Income Taxes
 The (provision) benefit provision for income taxes consists of the following:

 Current income tax (provision):

 Federal
 $
 ( 54)
 $
 ( 44)
 $
 ( 30)

 State
 ( 23)
 ( 13)
 ( 5)

 Foreign
 ( 26)
 ( 18)
 ( 9)

 Total current income tax (provision)
 ( 103)
 ( 75)
 ( 44)

 Deferred income tax benefit (provision):

 Federal

 State

 Foreign
 ( 5)

 Total deferred income tax benefit

 (Provision) benefit for income taxes
 $
 ( 56)
 $
 $

 The major elements contributing to the difference between the U.S. federal statutory rate and the effective tax rate are as follows:

 (Dollars in millions)
 Amount
 %
 Amount
 %
 Amount
 %

 Statutory Rate
 $
 ( 24)
 21.0
 %
 $
 21.0
 %
 $
 21.0
 %

 State income tax, net of the federal benefit
 ( 9)
 7.8
 %
 ( 2)
 ( 2.0)
 %
 2.2
 %

 ( 2)
 1.7
 %
 —
 ( 0.2)
 %
 ( 2)
 ( 0.5)
 %

 Goodwill impairment
 —
 —
 %
 —
 —
 %
 ( 39)
 ( 11.5)
 %

 Transaction costs
 —
 —
 %
 ( 1)
 ( 0.8)
 %
 —
 —
 %

 Stock-based compensation
 —
 —
 %
 ( 4)
 ( 3.0)
 %
 —
 —
 %

 Nontaxable or nondeductible items
 ( 3)
 2.6
 %
 0.4
 %
 —
 ( 0.1)
 %

 Divestitures
 ( 21)
 18.2
 %
 —
 —
 %
 —
 —
 %

 Tax differential on foreign operations
 ( 1)
 0.9
 %
 ( 1)
 ( 0.5)
 %
 ( 4)
 ( 1.0)
 %

 Tax credits
 ( 4.3)
 %
 4.6
 %
 0.6
 %

 Valuation allowance
 ( 7)
 6.1
 %
 13.0
 %
 ( 17)
 ( 5.1)
 %

 Unrecognized tax benefits
 ( 4.4)
 %
 —
 —
 %
 —
 —
 %

 Other
 ( 0.9)
 %
 —
 —
 %
 —
 —
 %

 (Provision) benefit for income taxes
 $
 ( 56)
 48.7
 %
 $
 32.5
 %
 $
 5.6
 %

 Deferred income taxes are recorded for differences in the basis of assets and liabilities for financial reporting and income tax purposes. The following table presents the components of Total deferred tax liabilities, net as October 3, 2025 and September 27, 2024:

 As of

 Deferred tax assets:

 Operating lease liabilities
 $
 $

 Reserves

 Interest expense

 Foreign tax credit

 Research expenditures

 Net operating losses and capital losses

 Other

 Valuation allowance
 ( 86)
 ( 76)

 Total deferred tax assets

 Deferred tax liabilities:

 Acquired intangible assets
 ( 441)
 ( 573)

 Operating lease right-of-use assets
 ( 51)
 ( 58)

 Property and equipment, net
 ( 9)
 ( 13)

 Equity method and consolidated investments
 ( 116)
 ( 113)

 Other
 ( 17)
 ( 18)

 Total deferred tax liabilities
 ( 634)
 ( 775)

 Total deferred tax liabilities, net
 $
 ( 260)
 $
 ( 365)

 Total deferred tax liabilities, net consists of deferred tax liabilities of $ 260 million and $ 370 million as of October 3, 2025 and September 27, 2024, respectively, and a net deferred tax asset of $ 0 million and $ 5 million recorded within other long-term assets as of October 3, 2025 and September 27, 2024, respectively.
 Included in net deferred tax assets are valuation allowances of $ 86 million and $ 76 million as of October 3, 2025 and September 27, 2024, respectively, primarily attributable to net operating losses and disallowed interest expense. The increase of

 $ 10 million in valuation allowance for the year ended October 3, 2025 was primarily related to the recognition of valuation allowances related to disallowed interest in the United States. Valuation allowances are recorded to reduce deferred tax assets to the amount that is more likely than not to be realized based on an assessment of positive and negative evidence, including estimates of future taxable income necessary to realize future deductible amounts. We expect to realize the benefit of these deferred tax assets primarily through future reversals of our deferred tax liabilities. Although realization is not assured, we believe it is more likely than not that all deferred tax assets for which valuation allowances have not been established will be realized.
 On July 4, 2025, the One Big, Beautiful Bill Act ("OBBBA") was enacted, introducing several significant amendments to U.S. income tax legislation including the permanent restoration of EBITDA as the basis for computing business interest expense limitations and the immediate expensing of research expenditures. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. We have incorporated these amendments into our fiscal year 2025 income tax provision, as applicable, which impacted the realizability of our deferred tax assets and valuation allowance assessment.
 We have approximately $ 45 million and $ 76 million of tax effected loss carryforwards related to the domestic and foreign income tax returns as of October 3, 2025 and September 27, 2024, respectively. The federal and foreign net operating losses have an indefinite carryforward. The state net operating loss carryforward will begin to expire in 2026. We also have $ 9 million of foreign tax credit carryforwards that will begin to expire in 2035, if unutilized.
 We have not recognized a U.S. deferred tax liability for the outside basis differences of certain foreign subsidiaries because we have asserted that these earnings are permanently reinvested outside of the U.S. It is not practicable to determine the amount of the unrecognized deferred tax liability associated with these earnings.
 We account for uncertain tax positions in accordance with ASC 740, Income Taxes, which prescribes the more likely than not threshold for recognition of a tax position in the financial statements.
 The following table summarizes the activity related to unrecognized tax benefits:

 Unrecognized Tax Benefits

 Balance at September 30, 2022
 $

 Reductions for tax positions related to prior years
 ( 1)

 Balance at September 29, 2023

 Additions for tax positions related to prior years

 Reductions for tax positions related to prior years
 ( 7)

 Additions for tax positions related to current years

 Lapse of statute of limitations
 ( 5)

 Settlements
 ( 4)

 Balance at September 27, 2024

 Additions for tax positions related to current years

 Lapse of statute of limitations
 ( 5)

 Balance at October 3, 2025
 $

 We file income tax returns in the U.S. and various foreign jurisdictions. With few exceptions, the statute of limitations for these jurisdictions is no longer open for audit or examination for the years before 2020 for federal income taxes in the U.S. and before 2016 with respect to various foreign jurisdictions. We are also subject to taxation in various states. We are under, or may be subject to, audit or examination and additional assessments by the relevant authorities.

 Note 10 — Retirement Plans
 Defined Contribution Plans
 The Company sponsors various participant-directed, defined contribution, 401(k) savings plans for the benefit of employees that meet certain eligibility requirements. The total expense for the defined contribution plans was $ 95 million, $ 55 million and $ 54 million for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively.
 Deferred Compensation Plans
 The Company has non-qualified deferred compensation programs which provide benefits payable to directors, officers, and certain key employees or their designated beneficiaries at specified future dates, upon retirement or death. The plans are

 unfunded and benefits are paid from the general assets of the Company. Participants' cash deferrals earn a return based on the participants' selection of investments in several hypothetical investment options.
 Defined Benefit Pension Plans
 The Company sponsors various postretirement benefit plans in the United States including defined benefit pension plans ("Defined Benefit Pension Plans"). The Defined Benefit Pension Plans are closed to new participants and benefits are generally based on the employee's years of creditable service and compensation. The Defined Benefit Pension Plans benefit obligations and the fair value of the plan assets were measured as of October 3, 2025.
 The following tables provide reconciliations of the changes in the Defined Benefit Pension Plans benefit obligations, reconciliations of the changes in the fair value of assets for the years ended October 3, 2025, September 27, 2024 and September 29, 2023 and reconciliations of the funded status as of October 3, 2025 and September 27, 2024.

 Change in benefit obligation

 Benefit obligation at beginning of period
 $
 $
 $

 Interest cost

 Benefits paid from the plans
 ( 21)
 ( 22)
 ( 21)

 Actuarial (gain) loss
 ( 10)
 ( 13)

 Benefit obligation at end of period
 $
 $
 $

 Change in plan assets

 Fair value of plan assets at beginning of period
 $
 $
 $

 Actual return on plan assets

 Employer contributions to plans
 —
 —

 Benefits paid from the plans
 ( 21)
 ( 22)
 ( 20)

 Fair value of plan assets at end of period
 $
 $
 $

 The benefit obligation remained materially consistent with the accumulated benefit obligation for each of the fiscal years ended October 3, 2025 and September 27, 2024. The net amount recognized within Other long-term assets as of October 3, 2025 and September 27, 2024 was $ 9 million and $ 2 million, respectively.
 As of October 3, 2025 and September 27, 2024, the fair values of the Defined Benefit Pension Plan by major asset categories were as follows:

 Carrying Value
 Quoted Prices in Active Markets (Level 1)
 Significant Other
Observable Inputs
(Level 2)
 Carrying Value
 Quoted Prices in Active Markets (Level 1)

 Investments measured at fair value

 Cash and cash equivalents
 $
 $
 $
 —
 $
 $

 Investment funds

 Fixed income funds

 Total investments measured at fair value
 $
 $
 $
 $
 $

 Investments measured at NAV

 Investment funds

 Common collective funds - debt
 $
 —
 $

 Diversified and equity funds

 Total investments measured at NAV

 Total
 $
 $

 Cash equivalents are mostly comprised of short term money market instruments and are valued at cost, which approximates fair value. Fixed income investment funds categorized as Level 1 are publicly traded on an active exchange. Fixed income funds, not traded on an active exchange, categorized as Level 2 are valued using pricing models that use verifiable observable market data (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. Common collective funds are valued based on net asset value ("NAV") per share or unit as a practical expedient as reported by the fund manager, multiplied by the number of shares or units held as of the measurement date. Accordingly, these NAV based investments have been excluded from the fair value hierarchy. These collective investment funds have minimal redemption notice periods and are redeemable daily at the NAV, less transaction fees, without significant restrictions. There are no significant unfunded commitments related to these investments.
 The Company may make discretionary contributions. The required minimum contributions and the expected annual future benefit payments for the Defined Benefit Pension Plans are not significant.
 Multiemployer Pension Plans
 We are subject to several collective-bargaining agreements ("CBAs") that require contributions to a multiemployer defined benefit pension plan that covers its union-represented employees. These plans are not significant for the years ended October 3, 2025, September 27, 2024 and September 29, 2023.

 Note 11 — Stock-Based Compensation
 As of October 3, 2025, we had the following stock-based compensation awards outstanding:
 • Time-based restricted stock units ("RSUs") within the Amentum Holdings, Inc. 2024 Stock Incentive Plan (the "Plan");
 • Performance-based restricted stock units ("PSUs") within the Plan;
 • Stock Options within the Plan; and the
 • Amentum Holdings, Inc. Employee Stock Purchase Plan ("ESPP").
 We issue new shares upon the vesting of stock units or exercising of stock options under these plans.
 The Plan provides Amentum's employees, non-employee directors and consultants the opportunity to receive various types of stock-based compensation awards including stock options, restricted stock units and performance-based awards, as well as cash awards. As of October 3, 2025, 15.9 million shares of Amentum's common stock was reserved for future issuance under the Plan.
 Time-based Restricted Stock Units
 The fair value of the RSUs was determined based on the Company's common stock closing price on the date of the grant. The RSUs generally vest 50 % a year over two years, 33 % a year over three years, 25 % a year over four years or cliff vest in three years. RSU compensation expense is recognized on a straight-line basis ratably over the requisite service period, which is generally the vesting period, unless otherwise specifically noted. Amounts recognized for forfeitures are adjusted periodically to reflect actual forfeitures.

 Changes in RSUs during the year ended October 3, 2025 were not significant. As of October 3, 2025, there was $ 27 million of unrecognized compensation expense related to the RSUs, scheduled to be recognized over a weighted-average period of 2 years. The fair value of RSUs that vested in fiscal years 2025 was $ 1 million. No RSUs vested in fiscal years 2024 and 2023.
 Conversion of Restricted Stock Units due to Transaction
 As part of the Transaction, 65,182 Jacobs' restricted stock units were converted to 342,741 of Amentum RSUs. The fair value of these RSUs was determined based on the Company's common stock on the Transaction date.
 Performance-based Restricted Stock Units
 Performance-based restricted stock units vest and the stock is issued at the end of the performance period, which can range from 1 to 3 years, based upon the achievement of specific performance conditions. If the performance does not satisfy the applicable conditions, no shares will be issued. The initial PSU grants occurred in fiscal year 2025.
 Changes in PSUs during the year ended October 3, 2025 were not significant. As of October 3, 2025, there was $ 10 million of unrecognized compensation cost which is expected to be recognized over a weighted average of 2 years.
 Stock Options
 During fiscal year 2025, we commenced the grants of stock options. The stock options have a vesting term of 3 years with a portion vesting each year over the vesting period.
 The fair value of the stock options is estimated based on the date of the grant using the Black-Scholes-Merton option-pricing model and stock option compensation expense is recognized on a straight-line basis ratably over the requisite service period, which is the vesting period.
 Changes in stock options during the year ended October 3, 2025 were not significant. No stock options were provided in fiscal years 2024 and 2023.
 Employee Stock Purchase Plan
 The Company adopted the Amentum Holdings, Inc. Employee Stock Purchase Plan ("ESPP") on September 27, 2024 and implemented the ESPP beginning July 01, 2025. The ESPP is a qualified plan under Section 423 of the Internal Revenue Code and allows eligible employees the right to purchase shares of our common stock at a 5 % discount of the market value on the last day of the offering period. For financial reporting purposes, the ESPP is considered non-compensatory, therefore no stock-based compensation expense is recognized to acquire shares under the ESPP.
 During fiscal year 2025, $ 3 million was received from ESPP plan participants for the issuance of Amentum common stock. As of October 3, 2025, participants have purchased 0.1 million shares under the ESPP, at a weighted-average price per share of $ 22.75. A total of 2.5 million shares remain available for future issuance under the ESPP.
 Amentum Joint Venture LP Class B units
 Prior to the Transaction, certain members of management were awarded Time-Vested Class B units and Performance-Vested Class B units in Amentum Joint Venture LP, our previous parent company ("AJVLP" and "Amentum Equityholder"). The Time-Vested Class B units vested 20 % a year over five years and the Performance-Vested Class B units vested upon the consummation of a change in control transaction and achievement of certain return metrics associated with such transaction. Both the Time-Vested Class B units and Performance-Vested Class B units were equity classified awards in Amentum Joint Venture LP.
 The fair value of the Class B units was estimated based on the date of the grant using the Black-Scholes-Merton option-pricing model. We recognized compensation expense for the Time-Vested Class B units based on grant date fair values. Prior to the Transaction, compensation expense for the Time-Vested Class B units was recognized on a straight-line basis ratably over the requisite service period, which was the vesting period.
 In connection with the completion of the Transaction on September 27, 2024, the unvested Time-Vested and Performance-Vested Class B units were discretionarily modified to vest in connection with the Transaction. Due to the modification, we recognized $ 13 million of compensation expense in the consolidated statements of operations for the year ended September 27, 2024. As of September 27, 2024, there was no unrecognized compensation expense related to the Time-Vested Class B units or the Performance-Vested Class B units. Amounts recognized for forfeitures were adjusted periodically to reflect actual forfeitures.
 For the fiscal years ended September 27, 2024 and September 29, 2023, we recognized Class B unit compensation expense of $ 18 million and $ 3 million, respectively. For the fiscal years ended September 27, 2024 and September 29, 2023, there were no income tax benefits recognized from Class B unit compensation expense.
 Stock-Based Compensation Expense and Related Tax Benefits Recognized

 Stock-based compensation expense and the related income tax benefits recognized under all plans were as follows:

 RSUs
 $
 $
 —
 $
 —

 PSUs
 —
 —

 Stock Options
 —
 —

 Class B units
 —

 Total stock-based compensation expense
 $
 $
 $

 Income tax benefits recognized from stock-based compensation
 $
 $
 —
 $
 —

 Note 12 — Debt
 Debt consisted of the following:

 As of

 Term Loan
 $
 3,000
 $
 3,750

 Senior notes
 1,000
 1,000

 Other

 Total debt
 4,008
 4,767

 Unamortized original issue discount and unamortized deferred financing costs
 ( 65)
 ( 88)

 Total debt, net of original issue discount and deferred financing costs
 3,943
 4,679

 Less current portion of long-term debt
 ( 42)
 ( 36)

 Total long-term debt, net of current portion
 $
 3,901
 $
 4,643

 Credit Facility
 On September 27, 2024, in connection with the consummation of the Transaction, we repaid all outstanding borrowings and other amounts under the prior first lien credit agreement and the prior second lien credit agreement dated as of January 31, 2020, as amended, (together, the "Prior Credit Agreements") and the Prior Credit Agreements were terminated on September 27, 2024.
 On September 27, 2024, we entered into a Credit Agreement (the "Credit Agreement"), by and among Amentum, the borrowing subsidiaries from time to time party thereto, the lenders from time to time party thereto and JPMorgan Chase Bank, N.A., as administrative agent, for a new senior secured credit facility (the "Credit Facility"). The Credit Facility provides for a seven year, $ 3,750 million term facility ("Term Loan") and a five year, $ 850 million revolving facility ("Revolver") including a $ 200 million letter of credit subfacility and a $ 100 million swingline subfacility. The Credit Agreement was originally entered into by Amentum Parent Holdings LLC, and Amentum became a party to, and a borrower under the Credit Agreement as a result of the merger between Amentum and Amentum Parent Holdings LLC entered into in connection with the Transaction. A portion of the Term Loan, in the amount of $ 1,130 million, was originally borrowed on September 27, 2024 by Amentum under a separate term credit agreement, also entered on September 27, 2024, but immediately after the effective time of the merger, that separate term credit agreement was superseded and replaced in its entirety by the Credit Agreement, and such portion of the term facility is now outstanding under, and governed by, the Credit Agreement. The remaining $ 2,620 million of the term facility was borrowed on September 27, 2024. The Revolver and the Term Loan mature on September 27, 2029 and September 27, 2031, respectively. The Credit Facility is secured by substantially all of our assets and guaranteed by substantially all of our domestic subsidiaries.
 A portion of the Credit Facility was used, together with other cash sources, to repay in full all outstanding borrowings and other amounts under the Prior Credit Agreements and to pay related fees and expenses related to the financing and the related transactions. Proceeds of the Revolver under the Credit Agreement may be used for general corporate purposes.
 In fiscal year 2025, we made voluntary principal payments on the Term Loan of approximately $ 191 million, $ 250 million and $ 281 million on June 27, 2025, July 31, 2025 and September 30, 2025, respectively, and as a result, we recognized $ 12 million of cost within loss on extinguishment of debt in the consolidated statements of operations during the fiscal year ended October 3, 2025. Due to the debt modification in fiscal year 2024, we recognized $ 31 million of debt issuance costs presented within loss on extinguishment of debt in the consolidated statements of operations for the year ended September 27, 2024. Further, we recognized $ 14 million of costs due to a loss on the debt modification presented within loss on extinguishment of

 debt in the consolidated statements of operations during the fiscal year ended September 27, 2024. There was no such charge during the year ended September 29, 2023.
 As of October 3, 2025 and September 27, 2024, the available borrowing capacity under the Credit Facility was $ 766 million and $ 808 million, respectively, and included $ 84 million and $ 42 million, respectively, in issued letters of credit. As of October 3, 2025 and September 27, 2024, there were no amounts borrowed under the Revolver.
 Interest Rates on Term Loan
 Under the Credit Facility, the interest rate per annum applicable to the Term Loan is, at the Company's option, equal to either the Alternate Base Rate ("ABR") plus 1.25 % or the Term Secured Overnight Financing Rate ("SOFR") plus 2.25 %. The interest rate per annum shall be reduced by 0.25 % in the event certain corporate ratings are achieved. The ABR is the rate equal to the highest of (a) the Prime Rate in effect on such day, (b) the New York Federal Reserve Bank ("NYFRB") Rate in effect on such day plus 0.50 % or (c) SOFR for a one-month interest period as published two U.S. Government Securities Business Days prior to such day plus 1.00 %.
 Term Loan Amortization Payments and Prepayments
 Under the Credit Facility, we are required to make quarterly principal amortization payments equal to 0.25 % of the original principal amount of the Term Loan, which commenced on March 31, 2025, with the remainder of the principal being due at maturity. Any repayments and prepayments of borrowings under the term facility may not be reborrowed. Beginning with fiscal year 2026, the Credit Facility contains an annual requirement to submit a portion of our excess cash flow (as defined in the Credit Facility), within ten business days of delivering annual financial statements, as a Term Loan prepayment. No such prepayments have been required or made.
 Interest Rates on Revolver & Swingline Loans
 Under the Credit Facility, borrowings under the Revolver are available in U.S. dollars, Canadian dollars, euro and Sterling. The interest rate per annum applicable to the Revolver, at the Company's option, is equal to either the ABR or Canadian Prime Rate plus 0.50 % to 1.25 % or the Term SOFR, EURIBOR or Term Canadian Overnight Report Rate Average ("CORRA") plus 1.50 % to 2.25 % based on our first lien leverage ratio.
 Interest Rates on Letter of Credit Subfacility and Unused Commitment Fees
 Under the Credit Facility, a portion of the revolving facility is available for the issuance of letters of credit in U.S. dollars, Canadian dollars, euro, Sterling and certain other foreign currencies. The interest rate per annum applicable to the letter of credit subfacility is equal to a range between 1.50 % to 2.25 % based on our first lien leverage ratio. All of our letters of credit under the Credit Facility are also subject to a 0.125 % fronting fee. The unused commitment fee on our Revolver is 0.25 % to 0.40 % based on our first lien leverage ratio.
 Covenants
 The Credit Agreement contains customary prepayment rights and customary mandatory prepayments, as well as customary affirmative and negative covenants that apply to Amentum and its restricted subsidiaries, including limitations on indebtedness, liens, restricted payments, restricted debt payments, investments, burdensome agreements, disposition of assets, transactions with affiliates, conduct of business and fundamental changes. The Term Loan does not include any financial maintenance covenants. The Revolver includes a financial maintenance covenant that requires, in certain circumstances tied to the usage of the Revolver and commenced with the second full fiscal quarter ended after September 27, 2024, compliance with a maximum first lien net leverage ratio of 5.25 to 1.00, stepping down to 5.00 to 1.00 commencing with the fifth full fiscal quarter ending after September 27, 2024. A breach of the financial maintenance covenant will only result in a default or event of default with respect to the Term Loan if the lenders under the Revolver have, as a result of such breach, demanded repayment of the obligations under the Revolver or otherwise accelerated such obligations (and terminated the commitments under the Revolver) and such demand or acceleration has not been rescinded.
 The Credit Agreement contains customary events of default (with customary qualifications, exceptions, grace periods and notice provisions), including nonpayment of principal, interest, fees or other amounts, defaults under other agreements, breach of loan documents, breach of representations and warranties, voluntary and involuntary bankruptcy or appointment of receiver, unsatisfied judgments and attachments, certain ERISA events, change of control, invalidity of guaranties, collateral documents and other loan documents, and obligations ceasing to constitute senior indebtedness for purposes of certain subordinated indebtedness.
 The obligations of Amentum and any borrowing subsidiaries under the Credit Agreement and certain designated cash management obligations, hedging obligations and ancillary services obligations, are unconditionally guaranteed on a senior basis (subject to customary exceptions) by, and secured by perfected first-priority security interests (subject to permitted liens

 and other customary exceptions) in substantially all tangible and intangible assets of Amentum and its wholly owned material domestic restricted subsidiaries.
 Senior Notes
 In connection with the consummation of the Transaction, on August 13, 2024, the Company completed an offering of $ 1.0 billion in aggregate principal amount of 7.250 % senior notes due August 1, 2032 (the "Senior Notes"). The proceeds of the notes offering were initially funded into escrow and released concurrently with the consummation of the merger. Interest on the Senior Notes accrues at the rate of 7.250 % per annum and is payable on February 1 and August 1 of each year, which commenced on February 1, 2025.
 The Senior Notes are governed by the terms of the indenture dated as of August 13, 2024 (the "Indenture"), among Amentum Holdings, Inc., the Guarantors (as defined below) and U.S. Bank Trust Company National Association, as trustee (the "Trustee") and collateral agent (the "Collateral Agent"). The Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by (1) the Company, and (2) our wholly-owned domestic restricted subsidiaries that currently guarantee the Credit Facility (the "Guarantors").
 The Senior Notes have not been registered under the Securities Act of 1933, as amended (the "Securities Act"), or the securities laws of any other jurisdiction. The Senior Notes may not be offered or sold in the United States or to U.S. persons (as defined in Regulation S) except in transactions exempt from, or not subject to, the registration requirements of the Securities Act. Accordingly, the Senior Notes were offered only to (1) "qualified institutional buyers" as defined in Rule 144A under the Securities Act and (2) outside the United States to non-U.S. persons in compliance with Regulation S under the Securities Act.
 Covenants
 The Indenture contains covenants that limit, among other things, our ability to:
 • incur additional indebtedness;
 • create liens or use assets as security in other transactions;
 • make certain payments, including loans, advances or capital contributions;
 • acquire capital stock, acquire all or substantially all of the assets of a division, line of business or other business unit;
 • dispose of certain assets;
 • make prepayments, redemptions and repurchases, more than one year prior to stated maturity, of certain debt; and
 • engage in transactions with affiliates.
 These covenants are subject to a number of important exceptions and qualifications as set forth in the Indenture.
 Upon the occurrence of specific kinds of change of control events (unless we elect to redeem the Senior Notes at our option prior thereto), holders of Senior Notes will have the right to require us to repurchase some or all of the Senior Notes at 101 % of their face amount, plus accrued and unpaid interest to the repurchase date.
 Optional Redemption
 The Senior Notes are redeemable at the option of the Company, in whole or in part, at any time and from time to time, upon not less than 30 nor more than 60 days' prior notice.
 At any time prior to August 1, 2027, we may, at our option and on one or more occasions, redeem all or a part of the Senior Notes, at a redemption price equal to 100.000 % of the principal amount of the Senior Notes redeemed plus (i) a premium of either the highest of (a) 1.00 % of the principal amount of the Senior Notes or (b) the United States Treasury Rate as of the redemption date plus 50 basis points, and (ii) accrued and unpaid interest.
 At any time prior to August 1, 2027, we may, at our option and on one or more occasions, redeem up to 40.0 % of the aggregate principal amount of the Senior Notes at a redemption price equal to (i) 107.250 % of the aggregate principal amount, in an amount equal to or less than the amount of net cash proceeds from one or more equity offerings, as defined in the Indenture, to the extent such net cash proceeds are received by or contributed to the Company or a Guarantor, plus (ii) accrued and unpaid interest.
 The Senior Notes may be redeemed at the following prices (expressed as a percentage of the principal amount), plus accrued and unpaid cash interest, if any, if redeemed during the 12-month period commencing on August 1 of the years set forth below:

 Redemption date
 Price

 On or after August 1, 2027
 103.625
 %

 On or after August 1, 2028
 101.813
 %

 On August 1, 2029 and thereafter
 100.000
 %

 Debt Maturity Schedule
 Future principal maturities of the Company's long-term debt as of October 3, 2025 are as follows:

 Year Ending September 30,

 2026
 $

 2027

 2028

 2029

 2030

 Thereafter
 3,812

 Total
 $
 4,008

 Cash Flow Hedges
 The Company utilizes derivative financial instruments to manage interest rate risk related to its variable rate debt. The Company's objective is to manage its exposure to interest rate movements and reduce volatility of interest expense. The Company entered into several interest rate swaps with an aggregate notional value of $ 1.6 billion that were designated as cash flow hedges, in which the Company will pay at the fixed rate and receive payment at a floating rate indexed to the three-month term SOFR through maturity. The swaps mature at various dates through January 31, 2027. The change in fair value of the interest rate swaps is presented within accumulated other comprehensive income on our consolidated balance sheet and subsequently reclassified into interest expense and other, net on our consolidated statements of income and comprehensive loss in the period when the hedged transaction affects earnings. See Note 13 — Fair Value of Financial Assets and Liabilities and Note 17 — Accumulated Other Comprehensive Income (Loss) for additional information.

 Note 13 — Fair Value of Financial Assets and Liabilities
 ASC 820 — Fair Value Measurements and Disclosures establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include:
 • Level 1, defined as observable inputs such as quoted prices in active markets;
 • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and
 • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
 The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis and the level they fall within the fair value hierarchy (in millions):

 Fair Value

 Description
 Classification
 Fair Value Hierarchy

 Interest rate swaps
 Prepaid expenses and other current assets
 Level 2
 $
 $

 Interest rate swaps
 Level 2
 —

 Interest rate swaps
 Level 2
 ( 4)
 ( 3)

 Interest rate swaps
 Level 2
 ( 2)
 ( 13)

 Note 14 — Leases
 We primarily lease office space, warehouses, housing, equipment and vehicles and recognize a right-of-use asset and lease liability on the lease commencement date through calculation of the present value of unpaid lease payments over the lease term. All lease payments are based on the passage of time and certain leases are subject to annual escalations for increases in base rents. The Company's lease terms include options to extend or terminate the lease when it is reasonably certain that we will

 exercise that option. We have no significant long-term purchase agreements with service providers and our lease agreements do not contain any material residual value guarantees or material restrictive covenants.
 Short-Term Leases
 We have elected the practical expedient for short-term lease recognition exemption by class of underlying asset which results in off-balance sheet accounting for leases with an initial term of 12 months or less ("short-term leases"). We recognize those lease payments in the consolidated statements of operations on a straight-line basis over the lease term. We also elected a package of practical expedients permitted under ASC 842 which allows the carry forward of historical lease classifications.
 Short-term lease rental expense was $ 53 million, $ 40 million and $ 42 million for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively.
 Operating Leases
 The Company's operating leases primarily include our material leases of buildings (consisting primarily of our corporate office lease commitments) and equipment and, if applicable, embedded leases associated with real estate, equipment and vehicles in certain contracts with an initial term of 12 months or longer. These leases are classified as operating leases and are recognized as right-of-use assets and operating lease liabilities on the consolidated balance sheets.
 The following tables present our operating leases as of October 3, 2025 and September 27, 2024:

 As of

 Classification

 Assets

 Operating lease right-of-use assets
 $
 $

 Total leased assets
 $
 $

 Liabilities

 Current

 Current portion of operating lease liabilities
 $
 $

 Noncurrent

 Long-term portion of operating lease liabilities

 Total lease liabilities
 $
 $

 Maturity of Lease Liabilities

 Operating Leases

 September 30, 2026
 $

 September 30, 2027

 September 30, 2028

 September 30, 2029

 September 30, 2030

 Thereafter

 Total lease payments

 Less: imputed interest
 ( 25)

 Present value of lease liabilities (1)

 $

 (1)As most of the Company's operating leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

 As of

 Lease Term and Discount Rate

 Weighted average remaining lease term (years)
 4.4
 4.4

 Weighted average discount rate
 4.6
 %
 4.0
 %

 The following tables present selected financial information for the years ended October 3, 2025, September 27, 2024 and September 29, 2023:

 Lease Cost

 Classification

 Operating lease cost
 $
 $
 $

 Selling, general and administrative expenses

 Net lease cost
 $
 $
 $

 Other Information

 Cash paid for amounts included in the measurement of lease liabilities

 Operating lease payments
 $
 $
 $

 Operating lease right-of-use assets obtained in exchange for new operating lease liability

 Note 15 — Related Parties
 Related Party Receivables
 The Company has related party receivables due from our equity method investments, discussed further in Note 16 — Joint Ventures.
 Consulting and Management Fees
 We previously had a Master Consulting and Advisory Services agreement ("Consulting Agreement") with American Securities LLC and Lindsay Goldberg LLC where, pursuant to the terms of the agreement, they made personnel available to us for the purpose of providing certain management and advisory services. We incurred $ 4 million of consulting fees in conjunction with the Consulting Agreement for the each of the years ended September 27, 2024 and September 29, 2023. There was no such expense during the year ended October 3, 2025.
 Capital Contribution
 In fiscal year 2024, immediately prior to the Transaction, Amentum Equityholder contributed $ 235 million in cash to the Company.

 Note 16 — Joint Ventures
 The Company's joint ventures provide services to customers including program management and operations and maintenance services. Joint ventures, the combination of two or more partners, are generally formed for a specific project. Management of the joint venture is typically controlled by a joint venture executive committee, comprised of representatives from the joint venture partners. The joint venture executive committee normally provides management oversight and controls decisions which could have a significant impact on the joint venture.
 We account for joint ventures in accordance with ASC 810, Consolidation, as discussed in Note 2 — Summary of Significant Accounting Policies. The Company analyzes its joint ventures and classifies them as either:
 • a VIE that must be consolidated because the Company is the primary beneficiary or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or
 • a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest.
 The following table presents selected financial information for our consolidated joint ventures that are VIEs as of October 3, 2025 and September 27, 2024:

 As of

 Cash and cash equivalents
 $
 $

 Current assets

 Non-current assets
 —

 Total assets
 $
 $

 Current liabilities
 $
 $

 Non-current liabilities
 —

 Total liabilities

 Total Amentum equity

 Total equity

 Total liabilities and equity
 $
 $

 The following table presents selected financial information for our consolidated joint ventures that are VIEs for the years ended October 3, 2025, September 27, 2024 and September 29, 2023:

 $
 1,489
 $
 $

 ( 1,371)
 ( 337)
 ( 281)

 Net income including non-controlling interests

 The Company has an ownership share in approximately 30 active joint ventures that were determined to be VIEs and are accounted for as equity method investments and the Company's ownership percentages generally range from 25 % to 50 %. The following table presents selected financial information for our unconsolidated joint ventures, included as equity method investments on the consolidated balance sheets, as of October 3, 2025 and September 27, 2024:

 As of

 Current assets
 $
 1,120
 $

 Non-current assets

 Total assets
 $
 1,169
 $

 Current liabilities
 $
 $

 Non-current liabilities

 Total liabilities

 Joint ventures' equity

 Total liabilities and joint ventures' equity
 $
 1,169
 $

 The following table presents selected financial information for our equity method investments for the years ended October 3, 2025, September 27, 2024 and September 29, 2023:

 $
 3,603
 $
 2,634
 $
 2,373

 ( 3,357)
 ( 2,442)
 ( 2,215)

 Net income including non-controlling interests

 Related party receivables due from our equity method investments were $ 63 million and $ 37 million as of October 3, 2025 and September 27, 2024, respectively. These receivables are a result of items purchased and services rendered by us on behalf of our equity method investments. We have assessed these receivables as having minimal collection risk based on our historic experience with these joint ventures and our inherent influence through our ownership interest. The related party revenues earned from our equity method investments was $ 276 million, $ 126 million and $ 45 million for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively.
 Many of our joint ventures only perform on a single contract. The modification or termination of a contract under a joint venture could trigger an impairment in the fair value of our investment in these entities. In the aggregate, our maximum exposure to losses was $ 196 million related to our equity method investments as of October 3, 2025.

 Note 17 — Accumulated Other Comprehensive Income (Loss)
 The accumulated balances and reporting period activities for the years ended October 3, 2025, September 27, 2024 and September 29, 2023 related to accumulated other comprehensive income (loss) are summarized as follows:

 Gain (Loss) on Derivative Instruments
 Foreign Currency Translation Adjustments
 Pension Adjustments
 Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)
 Accumulated Other Comprehensive Income (Loss)

 Balance at September 30, 2022
 $
 —
 $
 ( 8)
 $
 $
 ( 5)
 $

 Other comprehensive income (loss) before reclassification
 ( 14)

 Amounts reclassified from accumulated other comprehensive income (loss)
 ( 2)
 —
 ( 2)
 ( 3)

 Balance at September 29, 2023
 ( 5)
 ( 18)

 Other comprehensive (loss) income before reclassification
 ( 31)
 ( 10)

 Amounts reclassified from accumulated other comprehensive (loss) income
 ( 16)
 —
 ( 2)
 ( 15)

 Balance at September 27, 2024
 ( 22)
 ( 13)

 Other comprehensive income (loss) before reclassification
 ( 4)

 Amounts reclassified from accumulated other comprehensive (loss) income
 ( 7)
 —
 ( 1)
 ( 6)

 Balance at October 3, 2025
 $
 ( 8)
 $
 $
 $
 ( 15)
 $

 Note 18 — Segment Information
 We operate our business activities and report financial results as two reportable segments: Digital Solutions ("DS") and Global Engineering Solutions ("GES").
 The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients.
 The Global Engineering Solutions segment provides large-scale environmental remediation, nuclear power solutions, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations.
 The presentation of financial results as two reportable segments is consistent with the way the Company operates its business and the manner in which our chief operating decision maker ("CODM"), currently our Chief Executive Officer, manages the operations of the Company for purposes of allocating resources and assessing performance. The CODM evaluates the performance of our segments based on revenues and Adjusted EBITDA. Adjusted EBITDA is most comparable to net income (loss) attributable to common shareholders prepared based on GAAP. The Company defines Adjusted EBITDA as net income (loss) attributable to common shareholders adjusted for interest expense and other, net, provision for income taxes, depreciation and amortization, and certain discrete items that are not considered in the evaluation of ongoing operating performance. These discrete items include acquisition, transaction, and integration costs, non-cash gains and losses, loss on extinguishment of debt, utilization of certain fair market value adjustments assigned in purchase accounting, and stock-based compensation. While we believe Adjusted EBITDA is a useful metric in evaluating operating performance by allowing better evaluation of underlying segment performance and better period-to-period comparability, it is not a metric defined by GAAP and may not be comparable to non-GAAP metrics presented by other companies.
 In fiscal year 2025, the Company adopted ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. Amongst other amendments, the standard requires disclosure of significant segment expenses that are

 regularly provided to the CODM. Cost of revenues is the significant expense that is regularly provided to the Company's CODM, and includes direct contract costs such as labor, materials, and subcontractor costs, allocations of indirect costs, and depreciation expense related to property and equipment directly attributable to contracts.
 The following table presents segment information provided to the CODM and reconciles segment Adjusted EBITDA to net income (loss) attributable to common shareholders, with prior year performance measures recast to reflect the current reportable segment structure:

 DS
 GES
 Total
 DS
 GES
 Total
 DS
 GES
 Total

 $
 5,543
 $
 8,850
 $
 $
 1,981
 $
 6,407
 $
 8,388
 $
 1,899
 $
 5,966
 $
 7,865

 ( 4,924)
 ( 7,956)
 ( 12,880)
 ( 1,761)
 ( 5,829)
 ( 7,590)
 ( 1,659)
 ( 5,424)
 ( 7,083)

 Other segment expenses (1)

 ( 182)
 ( 227)
 ( 409)
 ( 61)
 ( 119)
 ( 180)
 ( 81)
 ( 105)
 ( 186)

 Adjusted EBITDA attributable to Amentum Holdings, Inc.
 $
 $
 $
 1,104
 $
 $
 $
 $
 $
 $

 Depreciation expense
 ( 40)
 ( 23)
 ( 27)

 Amortization of intangibles
 ( 479)
 ( 228)
 ( 298)

 Interest expense and other, net
 ( 353)
 ( 438)
 ( 397)

 ( 7)
 ( 1)
 ( 7)

 Acquisition, transaction and integration costs (2)

 ( 85)
 ( 62)
 ( 39)

 Non-cash GAAP expense (gain) (3)

 —
 ( 186)

 Loss on extinguishment of debt (4)

 ( 12)
 ( 45)
 —

 Utilization of fair market value adjustments (5)

 Stock-based compensation (6)

 ( 21)
 ( 18)
 ( 3)

 Income (loss) before income taxes
 ( 123)
 ( 340)

 Provision for income taxes
 ( 56)

 ( 83)

 Net income (loss) attributable to non-controlling interests

 $
 $
 ( 82)
 $

 (1) Represents the difference between segment revenues, costs of revenues, and Adjusted EBITDA attributable to Amentum Holdings, Inc. Other segment expenses primarily includes selling, general, and administrative expenses, and equity earnings of non-consolidated subsidiaries and excludes certain discrete items that are not considered in the evaluation of ongoing performance.
 (2) Represents acquisition, transaction and integration costs, including severance, retention, and other adjustments related to acquisition and integration activities.
 (3) Represents a non-cash goodwill impairment charge and a non-cash gain on acquisition of controlling interest.
 (4) Represents the write-off of debt discount and debt issuance costs as a result of debt modifications.
 (5) Represents the periodic utilization of the fair market value adjustments assigned to certain equity method investments and non-controlling interests based on the remaining period of performance for the related contract.
 (6) Represents non-cash compensation expenses recognized for stock-based arrangements.
 Asset information by segment is not a key measure of performance used by the CODM.

 Note 19 — Composition of Certain Financial Statement Captions
 The following tables present financial information of certain consolidated balance sheet captions.
 Prepaid expenses and other current assets

 As of

 Prepaid expenses
 $
 $

 Prepaid taxes

 Prepaid supplies and materials

 Other current assets

 Total prepaid expenses and other current assets
 $
 $

 Property and equipment, net

 As of

 Useful Lives

 Aircraft
 5 to 10 years

 $
 $

 Buildings
 20 to 40 years

 Computers and related equipment
 1 to 5 years

 Finance lease right-of-use assets
 Shorter of lease term or useful life

 Leasehold improvements
 Shorter of lease term or useful life

 Office furniture and fixtures
 1 to 7 years

 Vehicles and equipment
 1 to 10 years

 Gross property and equipment

 Less accumulated depreciation
 ( 110)
 ( 78)

 Total property and equipment, net
 $
 $

 Depreciation expense was $ 40 million, $ 23 million and $ 27 million for the years ended October 3, 2025, September 27, 2024 and September 29, 2023, respectively. As of October 3, 2025, September 27, 2024 and September 29, 2023, Property and equipment, net, also included the accrual for property additions in accounts payable of $ 3 million, $ 1 million and $ 2 million, respectively.

 As of

 Wages, compensation and other benefits
 $
 $

 Accrued vacation

 Total accrued compensation and benefits
 $
 $

 As of

 Contract losses
 $
 $

 Current portion of operating lease liabilities

 MARPA payable

 Reserves

 Customer payables

 Income tax payable

 Accrued other taxes

 Other

 Total other current liabilities
 $
 $

 As of

 Operating lease liabilities
 $
 $

 Reserves

 Other

 Total other long-term liabilities
 $
 $

 Note 20 — Earnings (Loss) Per Share
 For the periods prior to September 27, 2024, the Company retrospectively adjusted the weighted average shares used in determining loss per share to reflect the conversion of the ownership interests of Amentum Parent Holdings LLC held by AJVLP that converted into 90,021,804 shares of the Company's common stock at Transaction close. As discussed in Note 11 — Stock-Based Compensation certain employees of the Company were granted stock-based compensation in the form of Class B Time-Vested and Performance-Vested units of AJVLP. The compensation expense associated with such awards is recognized in the Company's financial statements, however as such shares represent outstanding equity of AJVLP, and not of the Company, such awards do not impact the Company's calculation of the weighted average shares outstanding.
 For the year ended September 27, 2024, Jacobs' restricted stock units converted to Amentum time-based restricted stock were excluded from the computation of diluted loss per share because inclusion of these amounts would have had an anti-dilutive effect. There were no anti-dilutive shares in fiscal year 2025 or 2023.
 Basic and diluted earnings (loss) per share are computed as follows (in millions, except per share data):

 $
 $
 ( 82)
 $

 Weighted-average number of basic shares outstanding during the period

 Dilutive effect of RSUs
 —
 —

 Weighted-average number of diluted shares outstanding during the period

 Basic earnings (loss) per share
 $
 0.27
 $
 ( 0.90)
 $
 ( 3.49)

 Diluted earnings (loss) per share
 $
 0.27
 $
 ( 0.90)
 $
 ( 3.49)

 Note 21 — Legal Proceedings and Commitments and Contingencies
 The Company is involved in various claims, disputes and administrative proceedings arising in the normal course of business. Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that an unfavorable result and/or liability will be incurred and the cost of the unfavorable result or liability can be reasonably estimated. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company's operations and liquidity.

 Payments to the Company on cost-plus-fee contracts are provisional and are subject to adjustments upon audit by the Defense Contract Audit Agency ("DCAA"). In management's opinion, audit adjustments that may result from audits not yet completed or started are not expected to have a material adverse effect on the Company's operations and liquidity.
 U.S. Government Investigations
 We primarily sell our services to the U.S. Government. These contracts are subject to extensive legal and regulatory requirements, and we are occasionally the subject of investigations by various agencies of the U.S. Government who investigate whether our operations are being conducted in accordance with these requirements. Such investigations could result in administrative, civil or criminal liabilities, including repayments, fines or penalties being imposed on us, or could lead to suspension or debarment from future U.S. Government contracting. U.S. Government investigations often take years to complete and may result in adverse action against us. Any adverse actions arising from such matters could have a material effect on our ability to invoice and receive timely payment on our contracts, perform contracts or compete for contracts with the U.S. Government and could have a material effect on our operating performance. There are currently no investigations that are expected to have a material impact on our results of operations.

 Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
 None.

 Item 9A. Controls and Procedures
 Evaluation of Disclosure Controls and Procedures
 Under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our disclosure controls and procedures (as such term is defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of such date. Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms and that such information is accumulated and communicated to management including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures.
 Changes in Internal Control Over Financial Reporting
 There have been no changes in our internal control over financial reporting (as such term is defined in rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal quarter ended October 3, 2025 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
 Management's Report on Internal Control Over Financial Reporting
 Our management is responsible for establishing and maintaining adequate internal control over financial reporting and for assessing the effectiveness of internal control over financial reporting. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
 • Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the issuer;
 • Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the issuer are being made only in accordance with authorizations of management and directors of the issuer; and
 • Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the issuer's assets that could have a material effect on the financial statements.
 Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
 The Company's management, with the participation of its CEO and CFO, conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework and criteria established in Internal Control-Integrated Framework (2013 Framework), issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this evaluation, our management has concluded that Amentum Holdings Inc.'s internal control over financial reporting was effective as of October 3, 2025.

 The effectiveness of the Company's internal control over financial reporting as of October 3, 2025 has been audited by Ernst & Young LLP, an independent registered public accounting firm, as stated in their report which is set forth below.

 Report of Independent Registered Public Accounting Firm

 To the Shareholders and Board of Directors of Amentum Holdings, Inc.

 Opinion on Internal Control Over Financial Reporting

 We have audited Amentum Holdings, Inc.'s internal control over financial reporting as of October 3, 2025, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Amentum Holdings, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of October 3, 2025, based on the COSO criteria.

 We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of October 3, 2025 and September 27, 2024, the related consolidated statements of operations, comprehensive income (loss), shareholders' equity and cash flows for each of the three years in the period ended October 3, 2025, and the related notes, and our report dated November 25, 2025 expressed an unqualified opinion thereon.

 Basis for Opinion

 The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

 We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

 Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

 Definition and Limitations of Internal Control Over Financial Reporting

 A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

 Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

 /s/ Ernst & Young LLP

 Tysons, Virginia

 Item 9B. Other Information
 During the three months ended October 3, 2025, neither the Company nor any director or officer of the Company adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as those terms are defined in Regulation S-K, Item 408.

 Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections
 Not applicable.

 The Information required by Items 11, 12, 13 and 14 of Part III of Form 10-K has been omitted in reliance on General Instruction G(3) and is incorporated herein by reference to our proxy statement to be filed with the SEC pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended, as set forth below.

 Item 10. Directors, Executive Officers and Corporate Governance
 Except for the specific disclosures below, the information required by this Item 10 is included in our Proxy Statement for the 2026 Annual Meeting of Shareholders to be filed within 120 days after the end of the company's fiscal year under the headings "Proposal 1 – Election of Directors", and "Corporate Governance and General Information Concerning the Board of Directors and Committees" and is herein incorporated by reference. Our Insider Trading Policy is included within the "Corporate Governance and General Information Concerning the Board of Directors and Committees" section of the Proxy Statement for the 2026 Annual Meeting of Shareholders.
 Code of Ethics
 We have adopted a code of ethics that applies to our principal executive officer, principal financial officer, principal accounting officer and persons performing similar functions. That code, our Code of Ethics for Senior Financial Officers, is posted in the "Investor Relations – Governance – Governance Documents" section of our website at www.amentum.com and a printed copy of such code will be furnished free of charge to any shareholder who requests a copy.
 We intend to disclose any amendment to the Code of Ethics for Senior Financial Officers that relates to any element of the code of ethics definition enumerated in Item 406(b) of Regulation S-K, and any waiver from a provision of the Code of Ethics for Senior Financial Officers granted to any director, principal executive officer, principal financial officer, principal accounting officer, or any other executive officer of the Company, in the "Investor Relations" section of our website at www.amentum.com within four business days following the date of such amendment or waiver. The information on our website is not incorporated by reference into and is not a part of this report.
 Corporate Governance Guidelines
 We have adopted a set of corporate governance guidelines in accordance with the requirements of Section 303A of the New York Stock Exchange Listed Company Manual. That code, our Corporate Governance Guidelines, is posted in the "Investor Relations – Governance – Governance Documents" section of our website at www.amentum.com and a printed copy will be furnished free of charge to any shareholder who requests a copy. The information on our website is not incorporated by reference into and is not a part of this report.

 Item 11. Executive Compensation
 The information required by this Item 11 will be incorporated herein by reference to the Proxy Statement for the 2026 Annual Meeting of Shareholders to be filed within 120 days after the end of the company's fiscal year.

 Item 12. Security Ownership of Certain Beneficial Owners and Management
 The information required by this Item 12 will be incorporated herein by reference to the Proxy Statement for the 2026 Annual Meeting of Shareholders to be filed within 120 days after the end of the company's fiscal year.

 Item 13. Certain Relationships and Related Transactions
 The information required by this Item 13 will be incorporated herein by reference to the Proxy Statement for the 2026 Annual Meeting of Shareholders to be filed within 120 days after the end of the company's fiscal year.

 Item 14. Principal Accountant Fees and Services
 The information required by this Item 14 will be incorporated herein by reference to the Proxy Statement for the 2026 Annual Meeting of Shareholders to be filed within 120 days after the end of the company's fiscal year.

 Item 15. Exhibits and Financial Statement Schedules
 The following documents are filed as part of this Annual Report:
 (1) Financial Statements
 • Consolidated Balance Sheets
 • Consolidated Statements of Operations
 • Consolidated Statements of Comprehensive Income (Loss)
 • Consolidated Statements of Shareholders' Equity
 • Consolidated Statements of Cash Flows
 • Notes to the Consolidated Financial Statements
 (2) Financial Statement Schedules
 • All schedules have been omitted because they are not applicable, not required or the information has been otherwise supplied in the consolidated financial statements or notes to consolidated financial statements.
 (3) Exhibits: The exhibits, which are filed with this Annual Report on Form 10-K or which are incorporated herein are set forth in the Exhibit Index.

 Filed
 with this Form 10-K
 Incorporated by Reference

 Exhibit No.
 Description
 Form
 Filing Date
 Exhibit No.

 2.1

 Agreement and Plan of Merger, dated November 20, 2023, by and among Jacobs Solutions Inc., Amazon Holdco Inc., Amentum Parent Holdings LLC and Amentum Joint Venture LP.

 September 13, 2024
 2.1

 2.2

 Amendment to Agreement and Plan of Merger, dated August 26, 2024, by and among Jacobs Solutions Inc., Amazon Holdco Inc., Amentum Parent Holdings LLC and Amentum Joint Venture LP.

 September 13, 2024
 2.2

 2.3

 Separation and Distribution Agreement, dated November 20, 2023, by and among Jacobs Solutions Inc., Amazon Holdco Inc., Amentum Parent Holdings LLC and Amentum Joint Venture LP.

 September 13, 2024
 2.3

 3.1

 Certificate of Incorporation of Amentum Holdings, Inc., as amended to date.

 3.1

 3.2

 By-laws of Amentum Holdings, Inc., as amended to date

 3.2

 4.1

 Indenture, dated as of August 13, 2024, between Amentum Escrow Corporation and U.S. Bank Trust Company, National Association, as trustee.

 8-K/A
 4.1

 4.2

 Form of 7.250% Senior Note due 2032 (included in Exhibit 4.1).

 8-K/A
 4.2

 4.3

 First Supplemental Indenture, dated as of September 27, 2024, between the guarantors party thereto and U.S. Bank Trust Company, National Association, as trustee.

 8-K/A
 4.3

 4.4

 Second Supplemental Indenture, dated as of September 27, 2024, between Amazon Holdco Inc. and U.S. Bank Trust Company, National Association, as trustee.

 8-K/A
 4.4

 4.5

 Third Supplemental Indenture, dated as of December 10, 2024, between Amazon Holdco Inc. and U.S. Bank Trust Company, National Association, as trustee.

 February 5, 2025
 4.1

 4.6

 Description of the Company's Securities Registered Pursuant to Section 12 of the Exchange Act of 1934.

 December 17, 2024
 4.5

 10.1

 Credit Agreement, dated as of September 27, 2024, by and among Amentum Holdings, Inc. (as successor in interest to Amentum Parent Holdings LLC), the borrowing subsidiaries from time to time party thereto, the lenders from time to time party hereto and JPMorgan Chase Bank, N.A., as administrative agent.

 8-K/A
 10.1

 10.2

 Transition Services Agreement by and between Jacobs Solutions Inc. and Amazon Holdco Inc.

 10.2

 10.3

 Project Services Agreement by and between Jacobs Solutions Inc. and Amazon Holdco Inc.

 10.3

 10.4

 Tax Matters Agreement by and between Jacobs Solutions Inc., Amazon Holdco Inc., Amentum Parents Holdings LLC and Amentum Joint Venture LP.

 10.4

 10.5

 Registration Rights Agreement by and between Amazon Holdco Inc. and Jacobs Solutions Inc.

 10.5

 10.6

 Stockholders Agreement by and between Amazon Holdco Inc. and Amentum Joint Venture LP.

 10.6

 10.7

 Form of Indemnification Agreement

 10.7

 10.8

 Amentum Holdings, Inc. 2024 Stock Incentive Plan *

 10.8

 10.9

 Amentum Holdings, Inc. Employee Stock Purchase Plan *

 10.9

 10.10

 Jacobs Technology Inc. Executive Deferral Plan *

 10.10

 10.11

 Amentum Holdings, Inc. Severance Plan for Key Employees *

 10.1

 10.12

 Form of Restricted Stock Unit Award Agreement for grants under the Amentum Holdings, Inc. 2024 Stock Incentive Plan *

 10.2

 10.13

 Form of Non-Employee Director Restricted Stock Unit Award Agreement for grants under the Amentum Holdings, Inc. 2024 Stock Incentive Plan *

 10.3

 10.14

 Form of Performance Share Unit Award Agreement for grants under the Amentum Holdings, Inc. 2024 Stock Incentive Plan *

 10.4

 10.15

 Form of Option Award Agreement for grants under the Amentum Holdings, Inc. 2024 Stock Incentive Plan *

 January 30, 2025
 10.1

 10.16

 Employment Agreement by and between Steven J. Demetriou and Amentum Holdings, Inc. *

 10.5

 10.17

 Employment Agreement by and between John E. Heller and Amentum Holdings, Inc. *

 10.6

 10.18

 Employment Agreement by and between Travis B. Johnson and Amentum Holdings, Inc. *

 10.7

 10.19

 Employment Agreement by and between Stephen Arnette and Amentum Holdings, Inc. *

 10.8

 10.20

 Employee Matters Agreement, dated November 20, 2023, by and among Jacobs Solutions Inc., Amazon Holdco Inc. and Amentum Parent Holdings LLC.

 September 13, 2024
 10.1

 19.1

 Amentum Holdings, Inc. Insider Trading Policy

 December 17, 2024
 19.1

 21.1

 Subsidiaries of the Registrant.

 X

 23.1

 Consent of Independent Registered Public Accounting Firm (Ernst & Young LLP).

 X

 31.1

 Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities and Exchange Commission.

 X

 31.2

 Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities and Exchange Commission.

 X

 32.1

 Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350.

 X

 32.2

 Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350.

 X

 97.1

 Policy Relating to Recovery of Erroneously Awarded Compensation

 December 17, 2024
 97.1

 101.INS

 101.SCH

 101.CAL

 101.DEF

 101.LAB

 101.PRE

 *
 Denotes a management contract, compensatory plan, or arrangement

 Item 16. Form 10-K Summary
 None.

 SIGNATURES

 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

 Registrant

 Date:
 By:
 /s/ John E. Heller

 John E. Heller

 Chief Executive Officer

 (Principal Executive Officer)

 Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

 Signatures
 Title
 Date

 /s/ John E. Heller
 Chief Executive Officer and Director
(Principal Executive Officer)

 John E. Heller

 /s/ Travis B. Johnson
 Chief Financial Officer
(Principal Financial Officer and Principal Accounting Officer)

 Travis B. Johnson

 /s/ Steven J. Demetriou
 Executive Chairman of the Board of Directors

 Steven J. Demetriou

 /s/ Benjamin Dickson
 Lead Independent Director

 Benjamin Dickson

 /s/ General Vincent K. Brooks

 General Vincent K. Brooks

 /s/ General Ralph E. Eberhart

 General Ralph E. Eberhart

 /s/ Alan E. Goldberg

 Alan E. Goldberg

 /s/ Leslie Ireland

 Leslie Ireland

 /s/ Barbara L. Loughran

 Barbara L. Loughran

 /s/ Sandra E. Rowland

 Sandra E. Rowland

 /s/ Christopher M.T. Thompson

 Christopher M.T. Thompson

 /s/ Russell Triedman

 Russell Triedman

 /s/ John Vollmer

 John Vollmer

 /s/ Connor Wentzell

 Connor Wentzell