Greenidge CFO sells shares to cover tax withholding

Greenidge Generation Holdings Inc.'s Chief Financial Officer, Christian Mulvihill, reported selling a total of 627 Class A Common Stock shares on September 16, 2025, at prices of $1.47 and $1.46 per share.

Rhea-AI Filing Summary

Greenidge Generation Holdings Inc.'s Chief Financial Officer, Christian Mulvihill, reported selling a total of 627 Class A Common Stock shares on September 16, 2025, at prices of $1.47 and $1.46 per share. A footnote explains these sales covered tax withholding obligations related to restricted stock unit vesting and were not discretionary trades. Following the transactions, he holds 98,018 Class A shares directly.

Insights

Financial Analyst

TL;DR: Routine insider share sales to cover RSU tax withholding; no indication of discretionary selling or change to ownership control.

The Form 4 documents two small sales by the CFO on 09/16/2025 at $1.47 and $1.46 per share explicitly to satisfy tax withholding for vested restricted stock units. The filing lists the post-transaction beneficial ownership figures of 98,640 and 98,018 shares on separate lines, consistent with withholding settlements rather than open-market disposals. This activity is administrative and does not, based on the filing, signal a shift in executive stake or control.

Corporate Governance Expert

TL;DR: Disclosure aligns with Section 16 reporting requirements and clarifies the non-discretionary nature of the transactions.

The Form 4 is properly executed and signed, shows the reporting person as an officer (Chief Financial Officer), and provides an explanatory remark that the sales were to cover tax withholding for RSU vesting. From a governance and compliance perspective, this is routine Section 16 reporting that documents compensation-related share settlements and preserves transparency for investors and regulators.

Insider Trade Summary

Net Seller: 627 shares

Net Sell 2 txns

Insider Mulvihill Christian

Role Chief Financial Officer

Sold 627 shs ($915.47)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	5	$1.47	$7.35
Sale	Class A Common Stock	622	$1.46	$908.12

Holdings After Transaction: Class A Common Stock — 98,018 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Shares sold (first transaction): 5 shares at $1.47 Shares sold (second transaction): 622 shares at $1.46 Total shares sold: 627 shares +1 more

4 metrics

Shares sold (first transaction) 5 shares at $1.47 Sale of Class A Common Stock on September 16, 2025

Shares sold (second transaction) 622 shares at $1.46 Sale of Class A Common Stock on September 16, 2025

Total shares sold 627 shares Aggregate of two reported non-derivative stock sales

Post-transaction holdings 98,018 shares Direct holdings of Class A Common Stock after reported sales

Key Terms

restricted stock units, tax withholding obligations, Class A Common Stock, non-derivative

4 terms

restricted stock units financial

"vesting of certain restricted stock units and does not represent a discretionary sale"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares sold to cover the tax withholding obligations in connection with vesting"

Class A Common Stock financial

"reported selling 627 Class A Common Stock shares on September 16, 2025"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

non-derivative financial

"transactions were reported as non-derivative sales of common stock"

FAQ

What insider transaction did Greenidge Generation (GREEL) report?

Greenidge Generation reported that CFO Christian Mulvihill sold 627 shares of Class A Common Stock on September 16, 2025, at prices between $1.46 and $1.47 per share in two separate transactions.

At what prices did the Greenidge (GREEL) CFO sell his shares?

Christian Mulvihill sold Greenidge Class A shares at $1.47 per share for 5 shares and $1.46 per share for 622 shares, both reported as non-derivative stock sales on September 16, 2025.

How many Greenidge (GREEL) shares does the CFO hold after this Form 4?

After these transactions, CFO Christian Mulvihill holds 98,018 shares of Greenidge Generation Holdings Inc. Class A Common Stock directly, as the reported post-transaction position.

Were the Greenidge (GREEL) CFO share sales discretionary trades?

A footnote states the shares sold represent stock disposed to cover tax withholding obligations in connection with vesting of restricted stock units and do not represent discretionary sales by the reporting person.

What type of security did the Greenidge (GREEL) CFO sell?

The reported transactions involve Class A Common Stock, listed as non-derivative securities, sold in open-market or private transactions according to the sale code description.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 09/17/2025 - 07:55 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

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)
09/16/2025

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	09/16/2025(1)		S		5	D	$1.47	98,640	D
Class A Common Stock	09/16/2025(1)		S		622	D	$1.46	98,018	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	09/17/2025
	** 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.
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