Star Equity (STRR) CAO granted RSUs, shares withheld for tax

Rhea-AI Filing Summary

Star Equity Holdings, Inc. Chief Accounting Officer Matthew K. Diamond received 3,993 shares of Common Stock on March 19, 2026 from previously granted performance-based RSUs under the company’s 2009 Incentive Plan.

To satisfy related tax obligations, 551 shares were withheld at $9.92 per share. After these transactions, he directly holds 20,938 shares, and footnotes note an additional 6,889 restricted stock units outstanding.

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^*

Diamond Matthew K

(Last) (First) (Middle)

C/O STAR EQUITY HOLDINGS, INC.

53 FOREST AVENUE, SUITE 101

(Street)

OLD GREENWICH CONNECTICUT 06870

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Star Equity Holdings, Inc. [ STRR ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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

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

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

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
Common Stock	03/19/2026		A		3,993(1)	A	$0	21,489	D
Common Stock	03/19/2026		F		551(2)	D	$9.92	20,938(3)	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. On January 24, 2025 (the "Grant Date"), the restricted stock units ("RSUs") were granted to the Reporting Person under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated (the "2009 Incentive Plan") for which the performance conditions related to vesting were satisfied as of March 19, 2026. The RSUs granted are subject to time-based vesting conditions that vest 33% on the first anniversary of the Grant Date (1,318 RSUs), 33% on the second anniversary of the Grant Date (1,318 RSUs), and 34% on the third anniversary of the Grant Date (1,357 RSUs).

2. This number represents shares of Star Equity Holdings, Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

3. Includes (i) 6,889 RSUs credited to the Reporting Person's account under the Issuer's 2009 Incentive Plan; and (ii) 14,049 shares of common stock. Each RSU is the economic equivalent of one share of Common Stock. RSUs may be settled pursuant to the 2009 Incentive Plan by the issuance of Common Stock, the payment of cash, or a combination of both.

Remarks:

	/s/ Matthew K. Diamond	03/23/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What does this Form 4 for Star Equity Holdings (STRR) disclose?

The filing shows Chief Accounting Officer Matthew K. Diamond received 3,993 shares of Common Stock from vested performance-based RSUs and had 551 shares withheld at $9.92 per share to cover taxes, leaving him with 20,938 directly held shares and 6,889 RSUs outstanding.

Was Matthew K. Diamond buying or selling Star Equity (STRR) shares?

He did not make open-market purchases or sales. He received 3,993 shares as a stock award from vested RSUs, while 551 shares were automatically withheld by the company to pay tax obligations tied to vesting, a standard compensation-related mechanism rather than a discretionary trade.

How many Star Equity (STRR) shares does the CAO hold after these transactions?

Following the Form 4 transactions, Matthew K. Diamond directly holds 20,938 shares of Star Equity Common Stock. Footnotes also state he has 6,889 restricted stock units outstanding, each economically equivalent to one share and settleable in stock, cash, or a combination under the 2009 Incentive Plan.

What are the vesting terms of the RSUs reported for Star Equity (STRR)?

The RSUs were granted on January 24, 2025, with performance conditions satisfied as of March 19, 2026. They vest over three years: 1,318 units on the first anniversary, 1,318 on the second, and 1,357 on the third, all under Star Equity’s 2009 Incentive Plan.

Why were 551 Star Equity (STRR) shares withheld in this Form 4?

The 551 shares represent Common Stock withheld to satisfy tax withholding obligations triggered when the performance-based RSUs vested. This "F"-coded transaction is a tax-withholding disposition, meaning the shares cover taxes owed rather than reflecting an open-market sale or discretionary liquidation.