Christian Mulvihill - 04 Mar 2026 Form 4 Insider Report for Greenidge Generation Holdings Inc. (GREE)

Role: Chief Financial Officer
Signature: /s/ Christian Mulvihill
Issuer symbol: GREE
Transactions as of: 04 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 13 Mar 2026, 18:37:32 UTC
Previous filing: 04 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mulvihill Christian	Chief Financial Officer	C/O GREENIDGE GENERATION HOLDINGS INC., 1159 PITTSFORD-VICTOR ROAD, SUITE 240, PITTSFORD	/s/ Christian Mulvihill	13 Mar 2026	0001998358

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GREE	Class A Common Stock	Award		+95,000	+100%	$0.000000^*	190,451	04 Mar 2026	Direct	F1, F2
transaction	GREE	Class A Common Stock	Tax liability		-34,010	-18%	$1.38^*	156,441	11 Mar 2026	Direct	F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.
F3	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.