Greenidge (NASDAQ: GREE) CFO reports routine share sales for RSU tax withholding

Rhea-AI Filing Summary

Greenidge Generation Holdings Inc. Chief Financial Officer reports routine share sales to cover taxes. On 02/02/2026, CFO Christian Mulvihill reported automatic sales of Class A Common Stock tied to restricted stock unit vesting. He sold 5 shares at $1.25 and 1,953 shares at $1.28 to satisfy tax withholding obligations, described as non‑discretionary. After these transactions, he directly owned 95,451 Class A shares.

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)
02/02/2026

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	02/02/2026(1)		S		5	D	$1.25	97,404	D
Class A Common Stock	02/02/2026(1)		S		1,953	D	$1.28	95,451	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. Represents the number of shares sold to cover the tax withholding obligations 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	02/04/2026
	** 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 transaction did GREE CFO Christian Mulvihill report?

Christian Mulvihill, CFO of Greenidge Generation Holdings Inc. (GREE), reported sales of Class A Common Stock on February 2, 2026. The filing shows small share sales connected to restricted stock unit vesting, with shares sold primarily to meet related tax obligations.

How many GREE shares did the CFO sell and at what prices?

The CFO sold 5 GREE Class A shares at $1.25 and 1,953 shares at $1.28. These transactions were reported as sales under code “S” and are linked to tax withholding for vesting restricted stock units, rather than open‑market discretionary selling.

Does the GREE Form 4 indicate discretionary selling by the CFO?

The Form 4 states the sales do not represent a discretionary sale by the reporting person. Instead, the shares were sold to cover tax withholding obligations related to the vesting of certain restricted stock units granted to the CFO.

How many GREE shares does the CFO own after the reported transactions?

Following the February 2, 2026 transactions, Christian Mulvihill directly owned 95,451 shares of Greenidge Generation Holdings Inc. Class A Common Stock. This post‑transaction balance reflects the shares remaining after the automatic sales for tax withholding purposes.

What role does Christian Mulvihill hold at Greenidge Generation Holdings Inc.?

Christian Mulvihill is reported as the Chief Financial Officer of Greenidge Generation Holdings Inc. The Form 4 lists him as an officer, not a director or 10% owner, and the filing is made by one reporting person in that executive capacity.

Why were GREE shares sold in connection with restricted stock units?

The footnote explains the shares were sold to cover tax withholding obligations from the vesting of restricted stock units. When such awards vest, companies often sell a portion of shares on behalf of the executive to satisfy required tax payments.