Star Equity Holdings Insider Diamond Files Form 4

TL;DR

**Insider Matthew K. Diamond just filed a Form 4 for Star Equity Holdings, signaling a potential change in his ownership.**

AI Summary

This Form 4 filing indicates that Matthew K. Diamond, a reporting person for Star Equity Holdings, Inc., filed a statement of changes in beneficial ownership of securities on March 23, 2026, for a period ending March 19, 2026. While the filing itself doesn't detail specific transactions, it signals that Mr. Diamond's holdings in Star Equity Holdings, Inc. may have changed. This matters to investors because changes in ownership by insiders like Mr. Diamond can sometimes signal their confidence (or lack thereof) in the company's future prospects.

Why It Matters

This filing signals potential changes in an insider's stake, which can influence investor perception of the company's health and future outlook.

Risk Assessment

Risk Level: low — A Form 4 filing itself is a routine disclosure and doesn't inherently carry high risk, though the underlying transaction might.

Analyst Insight

Investors should monitor subsequent filings or news from Star Equity Holdings, Inc. to understand the specific nature of the transaction (buy or sell) indicated by this Form 4, as it could provide insight into insider sentiment.

Key Players & Entities

• Diamond Matthew K (person) — Reporting Person
• Star Equity Holdings, Inc. (company) — Issuer
• 0001779155 (person) — CIK for Matthew K. Diamond
• 0001210708 (company) — CIK for Star Equity Holdings, Inc.

FAQ

Filing Documents

• wk-form4_1774313041.html (4)
• wk-form4_1774313041.xml (4) — 6KB
• 0001779155-26-000002.txt ( ) — 7KB

From the Filing

SEC FORM 4 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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).    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)

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View this 4 filing on SEC EDGAR