Matthew K. Diamond - 29 May 2026 Form 4 Insider Report for Star Equity Holdings, Inc. (STRR)

Reporting relationship: Chief Accounting Officer
Issuer ticker: STRR
Reported as of: 29 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 01 Jun 2026, 16:06:52 UTC
Prior SEC filing: 23 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Matthew K. Diamond

Key filing fact

Matthew K. Diamond filed Form 4 for Star Equity Holdings, Inc. (STRR) on 01 Jun 2026.

Key facts

This page summarizes Matthew K. Diamond's Form 4 filing for Star Equity Holdings, Inc. (STRR).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 01 Jun 2026, 16:06.

Change

Previous filing in this sequence was filed on 23 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001779155 Primary reporting owner

Diamond Matthew K

Relationship: Chief Accounting Officer
Address: C/O STAR EQUITY HOLDINGS, INC., 53 FOREST AVENUE, SUITE 101, OLD GREENWICH
Signature: /s/ Matthew K. Diamond
Signature date: 01 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

STRR transaction

Common Stock

Tax liability

Transaction value
Shares: -763
Change %: -3.6%
Price: $11.62^*
Shares after: 20,175
Date: 29 May 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

Includes (i) 4,813 Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Plan ("2009 Plan"); and (ii) 15,362 shares of common stock. Each Share Unit is the economic equivalent of one share of Common Stock. Share Units may be settled pursuant to the 2009 Plan by the issuance of Common Stock, the payment of cash, or a combination of both.