UNITED STATES
 SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-K/A
 (Amendment No. 1)
 (Mark One)

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

 For the fiscal year ended December 31, 2024
 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 001-40808
 Greenidge Generation Holdings Inc.
 (Exact name of Registrant as specified in its Charter)

 Delaware
 86-1746728

 (State or other jurisdiction of
incorporation or organization)
 (I.R.S. Employer
Identification No.)

 590 Plant Road, Dresden, New York

 14441

 (Address of principal executive offices)
 (Zip Code)

 Registrant's telephone number, including area code: ( 315) 536-2359
 Securities registered pursuant to Section 12(b) of the Act:

 Title of each class
 Trading
Symbol
 Name of each exchange on which registered

 Class A Common Stock, $0.0001 par value
 GREE
 The Nasdaq Global Select Market

 8.50% Senior Notes due 2026
 GREEL

 The Nasdaq Global Select Market

 Securities registered pursuant to Section 12(g) of the Act: None
 Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No x
 Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o No x
 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 x 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 x No o
 Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

 Large accelerated filer
 o

 Accelerated filer
 o

 Non-accelerated filer
 x

 Smaller reporting company
 x

 Emerging growth company
 x

 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. o
 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.

 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).
 Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x
 Based on the closing sale price of $2.69 of the Registrant's Class A common stock on The Nasdaq Global Select Market on June 30, 2024, the last business day of the Registrant's most recently completed second fiscal quarter, the aggregate market value of the voting common equity held by non-affiliates of the Registrant was $ 20,648,389.

 As of March 25, 2025, the Registrant had 11,741,704 shares of Class A common stock, $0.0001 par value per share, outstanding and 2,733,394 shares of Class B common stock, $0.0001 par value per share, outstanding.
 DOCUMENTS INCORPORATED BY REFERENCE
 Portions of the Registrant's definitive proxy statement for its 2025 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K where indicated. The Registrant's definitive proxy statement will be filed with the Securities and Exchange Commission within 120 days after December 31, 2024.

 Explanatory Note
 This Amendment No. 1 on Form 10-K/A (this "Amendment") amends the Annual Report on Form 10-K of Greenidge Generation Holdings Inc. (the "Company," "we," "us," or "our") for the year ended December 31, 2024 (the "Original Form 10-K") filed with the Securities and Exchange Commission (the "SEC") on March 31, 2025 ("Original Filing Date"). This Amendment is being filed solely to supplement the Exhibit Index contained in Item 15(a) of Part IV of the Original Form 10-K to include Exhibit 19.1, the Company's insider trading policy, and Exhibit 97.1, the Company's recovery of erroneously awarded compensation policy, which were inadvertently omitted in the Original Form 10-K.

 This Amendment is an exhibit-only filing. Except as described above, no changes have been made to the Original Form 10-K and this Amendment does not modify, amend or update in any way any of the financial or other information contained in the Original Form 10-K. This Amendment does not reflect events that may have occurred subsequent to the Original Filing Date. Accordingly, this Amendment should be read in conjunction with the Original Form 10-K and the Company's other filings with the SEC.

 Pursuant to Rule 12b-15 promulgated under the Securities Exchange Act of 1934, as amended, currently dated certifications from the Company's principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ("SOX") are attached to this Amendment as Exhibits 31.1 and 31.2. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. We are not including new certifications under Section 906 of SOX as no financial statements are being filed with this Amendment.

 ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 (a)The following documents are filed as part of this Annual Report:
 1.Consolidated Financial Statements
 The information set forth under "Consolidated Financial Statements" in Item 15 of the Original Form 10-K is hereby incorporated by reference.
 2.Consolidated Financial Statement Schedules
 The information set forth under "Consolidated Financial Statement Schedules" in Item 15 of the Original Form 10-K is hereby incorporated by reference.
 3.Exhibits
 The exhibits listed in the following Exhibit Index are filed or furnished with or incorporated by reference in this Amendment.
 EXHIBIT INDEX

 Exhibit
 Number

 Description

 2.1+

 Agreement and Plan of Merger, dated as of March 19, 2021, among Greenidge Generation Holdings Inc., Support.com, Inc. and GGH Merger Sub, Inc. (incorporated by reference to Annex A to the proxy statement/prospectus forming part of the Registration Statement on Form S-4 filed on May 4, 2021).

 3.1

 Second Amended and Restated Certificate of Incorporation of Greenidge Generation Holdings Inc., dated September 6, 2022 (incorporated by reference to Exhibit 3.1 to the Registration Statement on Form S-8 filed on October 31, 2022).

 3.1A

 Certificate of Amendment to the Second Amended and Restated Certificate of Incorporation of Greenidge Generation Holdings Inc., effective May 16, 2023 (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed on May 5, 2023).

 3.2

 Amended and Restated Bylaws of Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 3.2 to the Registration Statement on Form S-4 filed on July 16, 2021).

 4.1

 Indenture dated as of October 13, 2021 between Greenidge Generation Holdings Inc. and Wilmington Savings Fund Society, FSB, as trustee (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on October 13, 2021).

 4.2

 First Supplemental Indenture dated as of October 13, 2021 between Greenidge Generation Holdings Inc. and Wilmington Savings Fund Society, FSB, as trustee (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed on October 13, 2021).

 4.3

 Form of 8.50% Senior Note due 2026 (included as Exhibit A to Exhibit 4.2 above).

 4.4

 Description of Registrant's Securities (incorporated by reference to Exhibit 4.4 to the Annual Report on Form 10-K filed on March 31, 2025).

 10.1+

 Purchase and Sale Agreement, dated October 21, 2021, between LSC Communications MCL LLC and 300 Jones Road LLC. (incorporated by reference to Exhibit 10.8 to the Registration Statement on Form S-1 filed on December 1, 2021).

 10.2

 Greenidge Generation Holdings Inc. Second Amended and Restated 2021 Equity Incentive Plan (incorporated by reference to Annex A to the Definitive Information Statement on Form DEF 14C filed on November 18, 2024).

 10.3

 Form of Stock Option Agreement for Greenidge Generation Holdings Inc. 2021 Equity Incentive Plan (incorporated by reference to Exhibit 10.2 to the Registration Statement on Form S-4 filed on May 4, 2021).

 10.4

 Form of Restricted Stock Award Agreement for Greenidge Generation Holdings Inc. 2021 Equity Incentive Plan (incorporated by reference to Exhibit 10.3 to the Registration Statement on Form S-4 filed on May 4, 2021).

 10.5

 Form of Restricted Stock Unit Award Agreement for the Greenidge Generation Holdings Inc. 2021 Equity Incentive Plan (incorporated by reference to Exhibit 10.7 to the Quarterly Report on Form 10-Q filed on November 15, 2021).

 10.6

 Executive Employment Agreement, dated November 12, 2021, between Greenidge Generation Holdings Inc. and Robert Loughran (incorporated by reference to Exhibit 10.3 to the Quarterly Report on Form 10-Q filed on November 15, 2021).

 10.7

 Precedent Agreement between Greenidge Markets and Trading LLC and Empire Pipeline Inc. (incorporated by reference to Exhibit 10.7 to the Registration Statement on Form S-4/A filed on June 25, 2021).

 10.8

 Form of Indemnification Agreement with Directors and Officers of Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 10.6 to the Quarterly Report on Form 10-Q filed on November 15, 2021).

 10.9

 Purchase Agreement, dated as of April 7, 2022, between Greenidge Generation Holdings Inc. and B. Riley Principal Capital, LLC (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on April 8, 2022).

 10.10

 Amendment No. 1 to Common Stock Purchase Agreement, dated as of April 13, 2022, between Greenidge Generation Holdings Inc. and B. Riley Principal Capital, LLC (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on April 14, 2022).

 10.11

 Executive Employment Agreement, dated as of August 15, 2022, by and between Greenidge Generation Holdings Inc. and Dale Irwin (incorporated by reference to Exhibit 10.7 to the Quarterly Report on Form 10-Q filed on August 15, 2022).

 10.12

 At Market Issuance Sales Agreement, dated September 19, 2022, by and among Greenidge Generation Holdings Inc., B. Riley Securities, Inc. and Northland Securities, Inc. (incorporated by reference to Exhibit 1.1 to the Registration Statement on Form S-3 filed on September 19, 2022).

 10.13

 Amendment No. 1 to At Market Issuance Sales Agreement, dated October 3, 2022, by and among Greenidge Generation Holdings Inc., B. Riley Securities, Inc. and Northland Securities, Inc. (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on October 4, 2022).

 10.14

 Membership Interest and Asset Purchase Agreement, dated January 30, 2023, by and among NYDIG ABL LLC, Greenidge Generation Holdings, Inc., Greenidge Generation LLC, GSC Collateral LLC, and GNY Collateral LLC (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K filed on January 31, 2023).

 10.15

 Form of Hosting Services Agreement, dated as of January 30, 2023, between Greenidge South Carolina LLC and separate NYDIG subsidiaries (incorporated by reference to Exhibit 10.4 to the Company's Form 8-K filed on January 31, 2023).

 10.16

 Offer Letter, dated October 7, 2022, between Greenidge Generation Holdings Inc. and David Anderson (incorporated by reference to Exhibit 10.27 to the Annual Report on Form 10-K filed on March 31, 2023).

 10.17*

 Release Agreement, dated April 26, 2024, between Greenidge Generation Holdings Inc. and Scott MacKenzie (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on April 29, 2024).

 10.18

 Form of Stock Option Inducement Award Agreement (incorporated by reference to Exhibit 99.1 to the Registration Statement on Form S-8 filed on October 31, 2022).

 10.19

 Asset Purchase Agreement (the "APA"), dated November 9, 2023, by and among (i) NYDIG ABL LLC ("NYDIG"), (ii) SC 1 Mining Site LLC, an Affiliate of NYDIG, (iii) Greenidge Generation Holdings Inc. ("Holdings"), (iv) Greenidge South Carolina, LLC, a wholly-owned direct subsidiary of Holdings ("Property Seller Parent"), (v) 300 Jones Road LLC, a wholly-owned indirect subsidiary of Property Seller Parent, and (vi) each of the wholly-owned direct and indirect Subsidiaries of Holdings listed on Annex I thereto (incorporated by reference to Exhibit 10.8 of the Quarterly Report on Form 10-Q filed on November 14, 2023).

 10.20

 Real Estate Purchase and Sale Agreement dated November 9, 2023, by and among (i) SC 1 Mining Site LLC, (ii) Greenidge Generation Holdings Inc. ("Holdings"), (iii) Greenidge South Carolina LLC, a wholly-owned direct Subsidiary of Holdings ("Property Seller Parent"), (iv) 300 Jones Road LLC, a wholly-owned indirect Subsidiary of Property Seller Parent, and (v) each of the wholly-owned direct and indirect Subsidiaries of Holdings listed on Annex I of the APA (incorporated by reference to Exhibit 10.9 to the Quarterly Report Form 10-Q filed on November 14, 2023).

 10.21

 Transition Services Agreement, dated November 9, 2023, by and between SC 1 Mining Site LLC and Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 10.10 to the Quarterly Report on Form 10-Q filed on November 14, 2023).

 10.22

 Hosting Order Termination Agreement, dated November 9, 2023, between Greenidge South Carolina LLC, and SC 1 Mining LLC (incorporated by reference to Exhibit 10.11 to the Quarterly Report on Form 10-Q filed on November 14, 2023).

 10.23

 Offer Letter, effective October 11, 2023, between Greenidge Generation Holdings Inc. and Christian Mulvihill (incorporated by reference to Exhibit 10.37 to the Annual Report on Form 10-K filed on April 9, 2024).

 10.24

 Offer Letter, dated November 16, 2023, between Greenidge Generation Holdings Inc. and Jordan Kovler (incorporated by reference to Exhibit 10.37 to the Annual Report on Form 10-K filed on April 9, 2024).

 10.25

 Master Services Agreement, dated December 11, 2023, by and between Greenidge Generation Holdings Inc. and Infinite Reality, Inc. (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on December 12, 2023).

 10.26

 Equity Exchange Agreement, dated December 11, 2023, by and between Greenidge Generation Holdings Inc. and Infinite Reality, Inc. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed on December 12, 2023).

 10.27

 Stock Purchase Warrant, dated December 11, 2023, issued by Greenidge Generation Holdings Inc. to Infinite Reality, Inc. (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K filed on December 12, 2023).

 10.28

 Warrant to Purchase Shares of Common Stock, dated December 11, 2023, issued by Infinite Reality, Inc. to Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 10.4 to the Current Report on Form 8-K filed on December 12, 2023).

 10.29

 Securities Purchase Agreement, dated February 12, 2024, by and between Greenidge Generation Holdings Inc. and Armistice Capital Master Fund Ltd. (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on February 16, 2024).

 10.30

 Pre-Funded Common Stock Purchase Warrant, dated February 14, 2024, issued by Greenidge Generation Holdings Inc. to Armistice Capital Master Fund Ltd. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed on February 16, 2024).

 10.31

 Common Stock Purchase Warrant, dated February 14, 2024, issued by Greenidge Generation Holdings Inc. to Armistice Capital Master Fund Ltd. (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K filed on February 16, 2024).

 10.32

 Commercial Purchase and Sale Agreement, dated March 6, 2024, by and between Greenidge Mississippi LLC and Janesville, LLC (incorporated by reference to Exhibit 10.46 to the Annual Report on Form 10-K filed on April 9, 2024).

 10.33

 Common Stock Purchase Agreement, dated July 30, 2024, between Greenidge Generation Holdings Inc. and B. Riley Principal Capital II, LLC (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on July 31, 2024).

 10.34

 Registration Rights Agreement, dated July 30, 2024, between Greenidge Generation Holdings Inc. and B. Riley Principal Capital II, LLC (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed on July 31, 2024).

 10.35

 Equity Interest Payment Agreement, dated January 24, 2025, by and among (i) Greenidge Generation Holdings Inc., (ii) Atlas Capital Resources (A9) LP, (iii) Atlas Capital Resources (A9-Parallel) LP and (iv) Atlas Capital Resources (P) LP (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on January 28, 2025).

 19.1

 Insider Trading Policy of Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 19.1 to the Annual Report on Form 10-K filed on April 9, 2024).

 21.1

 Subsidiaries of Greenidge Generation Holdings Inc. (incorporated by reference to Exhibit 21.1 to the Annual Report on Form 10-K filed on March 31, 2025).

 23.1

 Consent of MaloneBailey LLP (incorporated by reference to Exhibit 23.1 to the Annual Report on Form 10-K filed on March 31, 2025).

 31.1*

 Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

 31.2*

 Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

 32.1**

 Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (incorporated by reference to Exhibit 32.1 to the Annual Report on Form 10-K filed on March 31, 2025).

 32.2**

 Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (incorporated by reference to Exhibit 32.1 to the Annual Report on Form 10-K filed on March 31, 2025).

 97.1

 Policy for the Recovery of Erroneously Awarded Compensation (incorporated by reference to Exhibit 97.1 to the Annual Report on Form 10-K filed on April 10, 2025).

 101.INS

 101.SCH

 101.CAL

 101.DEF

 101.LAB

 101.PRE

 _______________

 *

 Filed herewith

 **

 The certifications furnished in Exhibits 32.1 and 32.2 hereto are deemed to accompany this Annual Report and will not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and are not to be incorporated by reference into any of the Registrant's filings under the Securities Act of 1933, as amended or the Securities Exchange Act of 1934, as amended, irrespective of general incorporation language contained in any such filing.

 +

 Certain schedules and exhibits have been omitted pursuant to Item 601(a)(5) or Item 601(b)(2) of Regulation S-K. The Registrant hereby undertakes to furnish copies of the omitted schedule or exhibit upon request by the Securities and Exchange Commission.

 Management contract or compensatory plan or arrangement.

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

 GREENIDGE GENERATION HOLDINGS INC.

 Date: April 21, 2025

 By:
 /s/ Jordan Kovler

 Jordan Kovler

 Chief Executive Officer