Diamond Matthew K 4

4 · Star Equity Holdings, Inc. · Filed Mar 23, 2026

AI-generated summary of this filing

Updated Mar 24, 2026

Star Equity (STRR) Chief Accounting Officer Matthew Diamond Receives RSUs

What Happened

Matthew K. Diamond, Chief Accounting Officer of Star Equity Holdings, received 3,993 restricted stock units (RSUs) that vested on March 19, 2026 (reported as an acquisition at $0.00 per share).
To satisfy the tax withholding due on the vesting, 551 shares were withheld/disposed at $9.92 per share, yielding $5,466 (reported as a disposal for tax withholding).
This is an award/vesting event (not an open-market purchase or sale); the withheld shares are routine tax-withholding, not a market sale for cash.

Key Details

Transaction date: March 19, 2026; Form 4 filed March 23, 2026 (timely within required business-day filing window).
Award: 3,993 RSUs acquired at $0.00 (vested RSUs).
Tax withholding: 551 shares disposed at $9.92 each, totaling $5,466.
Reported holdings after the transaction (per filing footnote): includes 6,889 RSUs credited to the account and 14,049 shares of common stock.
Footnotes of note:
- F1: RSUs were granted on January 24, 2025; performance conditions were satisfied as of March 19, 2026. The original RSU grant vests time-based 33%/33%/34% over three years (1,318 / 1,318 / 1,357).
- F2: The 551-share disposal represents withholding to satisfy tax obligations on vesting.
- F3: Clarifies the reporting person’s holdings include both RSUs and outstanding common shares.

Context

This filing documents vested equity (award) and a routine tax-withholding disposition—common when RSUs vest. It should not be read as a directional buy/sell signal by itself; the only cash event here is the withholding to cover taxes.

Form 4

Period: 2026-03-19

Chief Accounting Officer

Transactions

Footnotes (3)

[F1]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).
[F2]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.
[F3]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.

Signature

/s/ Matthew K. Diamond|2026-03-23

1 file