Greenidge Generation (GREE) CFO awarded 95,000 RSUs and has 34,010 shares withheld for taxes

Rhea-AI Filing Summary

Greenidge Generation Holdings Inc. Chief Financial Officer Christian Mulvihill reported compensation-related stock transactions. On March 4, 2026, he received 95,000 restricted stock units as bonus compensation for fiscal year 2025, which vested immediately and convert into an equal number of Class A Common shares.

On March 11, 2026, 34,010 shares were withheld at $1.38 per share to cover his tax liability from vesting, which the company notes was not a discretionary sale. After these events, he directly owns 156,441 Class A Common shares. The Form 4 was filed late due to an administrative issue tied to migration to a new stock administration platform.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mulvihill Christian

(Last) (First) (Middle)

C/O GREENIDGE GENERATION HOLDINGS INC.

1159 PITTSFORD-VICTOR ROAD, SUITE 240

(Street)

PITTSFORD NY 14534

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Greenidge Generation Holdings Inc. [ GREE ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	03/04/2026(1)(2)		A		95,000	A	$0	190,451	D
Class A Common Stock	03/11/2026(3)		F		34,010	D	$1.38	156,441	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This Form 4 is being filed late due to an inadvertent administrative oversight related to the Issuer's migration to a new employee stock administration platform, which delayed the timely reporting of the transaction and was not the result of any error by the Reporting Person.

2. Represents restricted stock units granted as bonus compensation for fiscal year 2025 pursuant to the Issuer's Third Amended and Restated 2021 Equity Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock and vested immediately.

3. Represents the number of shares withheld to cover the Reporting Person's tax liability in connection with the vesting of certain restricted stock units and does not represent a discretionary sale by the Reporting Person.

Remarks:

	/s/ Christian Mulvihill	03/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transactions did GREE CFO Christian Mulvihill report?

Christian Mulvihill reported a grant and a tax withholding. He received 95,000 restricted stock units as a fiscal 2025 bonus, then 34,010 shares were withheld later to cover taxes related to the vesting of those units.

How many Greenidge (GREE) shares does the CFO hold after these Form 4 transactions?

After the reported transactions, the CFO holds 156,441 shares. This figure reflects his direct ownership of Class A Common Stock following the RSU grant, immediate vesting, and subsequent share withholding for tax obligations.

Was the 34,010-share disposition by GREE’s CFO an open-market sale?

No, the 34,010 shares were withheld for taxes, not sold. The shares covered Christian Mulvihill’s tax liability from vesting restricted stock units and are explicitly described as not representing a discretionary sale by him.

What was the nature of the 95,000-share award to GREE’s CFO?

The 95,000 shares were restricted stock units granted as bonus pay. They were issued under Greenidge’s Third Amended and Restated 2021 Equity Incentive Plan for fiscal year 2025 and vested immediately into Class A Common Stock.

Why was this Greenidge (GREE) Form 4 filing submitted late?

The filing delay stemmed from an administrative oversight. Greenidge notes it related to migration to a new employee stock administration platform and specifies the delay was not due to any error by the reporting person.

Did GREE’s CFO buy or sell shares in the market in this Form 4?

The Form 4 shows no open-market buys or sells. It reports a compensation-related restricted stock unit grant and a tax-withholding disposition only, with no transactions coded as open-market purchases or sales.