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Diamond Matthew K

Disclosed activity across 1 company

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42751
SEC CIK
0001779155

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Star Equity Holdings, Inc.STRR · Entity 7343Chief Accounting OfficerMay 29, 2026June 01, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Star Equity Holdings, Inc.

Report date May 29, 2026 · Filed June 01, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect20,175 Reported balance After 2026-05-29 transaction · row 1 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 1 · 2026-05-29 · Tax withholding · Disposed 763 · Balance 20,175

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.

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.

Filing footnotes · ownership attribution and instrument terms

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.

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.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
May 29, 2026 Filed Jun 1, 2026 20:06 UTC Star Equity Holdings, Inc. STRR · Entity 7343 Tax withholdingCommon Stock 763 $11.62 $8,866.06
Disclosure

SEC source: 0001779155-26-000004 · wk-form4_1780344408.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,175

F1 · shares: 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.

F2 · balance_after: 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.

Read SEC document
March 19, 2026 Filed Mar 24, 2026 00:44 UTC Star Equity Holdings, Inc. STRR · Entity 7343 Tax withholdingCommon Stock 551 $9.92 $5,465.92
Disclosure

SEC source: 0001779155-26-000002 · wk-form4_1774313041.xml · nonDerivative · entry 2

Diamond Matthew K · CIK 0001779155 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,938

F2 · shares: 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 · balance_after: 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.

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March 19, 2026 Filed Mar 24, 2026 00:44 UTC Star Equity Holdings, Inc. STRR · Entity 7343 GrantCommon Stock 3,993 $0.00 $0.00
Disclosure

SEC source: 0001779155-26-000002 · wk-form4_1774313041.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,489

F1 · shares: 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).

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May 29, 2025 Filed May 30, 2025 20:41 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 868 $8.66 $7,516.88
Disclosure

SEC source: 0001210708-25-000036 · wk-form4_1748637672.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,496

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of time-based restricted stock units.

F2 · balance_after: Includes (i) 4,214 Share Units credited to the Reporting Person's account under the 2009 Plan ; and (ii) 13,282 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.

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March 07, 2025 Filed Mar 10, 2025 20:02 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 554 $10.20 $5,650.80
Disclosure

SEC source: 0001210708-25-000006 · wk-form4_1741636926.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,364

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

F2 · balance_after: Includes (i) 6,290 Share Units credited to the Reporting Person's account under the 2009 Plan ; and (ii) 12,074 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.

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May 29, 2024 Filed May 31, 2024 20:11 UTC Star Equity Holdings, Inc. HSON · Entity 7343 GrantCommon Stock. 6,290 $0.00 $0.00
Disclosure

SEC source: 0001210708-24-000046 · wk-form4_1717186278.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,918

F1 · shares: Share Units granted May 29, 2024, to the Reporting Person under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of May 17, 2022 (the "2009 Plan"). The Share Units are subject to time-based vesting conditions that vest 33% on the first anniversary of the date of grant, 33% on the second anniversary of the date of grant, and 34% on the third anniversary of the date of grant.

F2 · balance_after: Includes (i) 7,617 Share Units credited to the Reporting Person's account under the 2009 Plan ; and (ii) 11,301 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.

Read SEC document
March 18, 2024 Filed Mar 19, 2024 20:21 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 1,707 $16.71 $28,523.97
Disclosure

SEC source: 0001210708-24-000017 · wk-form4_1710879688.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,628

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
March 07, 2024 Filed Mar 8, 2024 21:04 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 539 $14.00 $7,546.00
Disclosure

SEC source: 0001210708-24-000004 · wk-form4_1709931872.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,335

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
January 27, 2024 Filed Feb 14, 2024 21:12 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 607 $14.80 $8,983.60
Disclosure

SEC source: 0001210708-24-000002 · wk-form4_1707945110.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,874

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
March 31, 2023 Filed Apr 4, 2023 22:35 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 465 $22.27 $10,355.55
Disclosure

SEC source: 0001210708-23-000042 · wf-form4_168064769580043.xml · nonDerivative · entry 3

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,481

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
March 31, 2023 Filed Apr 4, 2023 22:35 UTC Star Equity Holdings, Inc. HSON · Entity 7343 GrantCommon Stock. 3,908 $0.00 $0.00
Disclosure

SEC source: 0001210708-23-000042 · wf-form4_168064769580043.xml · nonDerivative · entry 2

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,946

F3 · shares: Share Units granted March 7, 2022 to the Reporting Person under the 2009 Plan for which the performance conditions to vesting were satisfied as of March 31, 2023. The Share Units are subject to time-based vesting conditions that vest 33% on the first anniversary of the date of grant, 33% on the second anniversary of the date of grant, and 34% on the third anniversary of the date of grant.

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
March 17, 2023 Filed Apr 4, 2023 22:35 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingCommon Stock. 1,627 $21.12 $34,362.24
Disclosure

SEC source: 0001210708-23-000042 · wf-form4_168064769580043.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,038

F1 · shares: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

F2 · balance_after: Includes Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

Read SEC document
January 27, 2023 Filed Jan 30, 2023 23:41 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingShare Units 590 $25.09 $14,803.10
Disclosure

SEC source: 0001210708-23-000017 · wf-form4_167512207643394.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,665

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

Read SEC document
March 18, 2022 Filed Mar 22, 2022 21:35 UTC Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingShare Units 1,427 $33.90 $48,375.30
Disclosure

SEC source: 0001210708-22-000043 · wf-form4_164798489962090.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,255

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

Read SEC document
March 11, 2022 Filed Mar 15, 2022 00:11 UTC Amendment Star Equity Holdings, Inc. HSON · Entity 7343 GrantShare Units 12,000 $0.00 $0.00
Disclosure

SEC source: 0001210708-22-000037 · wf-form4a_164730304123823.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,272

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3,2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: Share Units granted March 18, 2021 to the Reporting Person under the 2009 Plan for which the performance conditions to vesting were satisfied as of March 11, 2022. The Share Units are subject to time-based vesting conditions that vest 33% on the first anniversary of the date of grant, 33% on the second anniversary of the date of grant, and 34% on the third anniversary of the date of grant.

Read SEC document
March 11, 2022 Filed Mar 14, 2022 20:42 UTC Star Equity Holdings, Inc. HSON · Entity 7343 GrantShare Units 12,000 $0.00 $0.00
Disclosure

SEC source: 0001210708-22-000033 · wf-form4_164729039358888.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,272

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3,2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: Share Units granted March 18, 2021 to the Reporting Person under the 2009 Plan for which the performance conditions to vesting were satisfied as of March 11, 2022. The Share Units are subject to time-based vesting conditions that vest 33% on the first anniversary of the date of grant, 33% on the second anniversary of the date of grant, and 34% on the third anniversary of the date of grant.

Read SEC document
January 27, 2022 Filed Mar 15, 2022 00:11 UTC Amendment Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingShare Units 590 $0.00 $0.00
Disclosure

SEC source: 0001210708-22-000037 · wf-form4a_164730304123823.xml · nonDerivative · entry 2

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,682

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3,2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F3 · kind: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

Read SEC document
January 27, 2022 Filed Mar 22, 2022 21:34 UTC Amendment Star Equity Holdings, Inc. HSON · Entity 7343 Tax withholdingShare Units 590 $28.02 $16,531.80
Disclosure

SEC source: 0001210708-22-000041 · wf-form4a_164798482207026.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,682

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3, 2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: This number represents shares of Hudson Global Inc. Common Stock withheld to satisfy the tax withholding obligation due upon vesting of performance-based restricted stock units.

F3 · price: This Form 4 is being amended to include the price at which shares were withheld for payment of taxes, which amount was inadvertently omitted from the original filing due to clerical error.

Read SEC document
March 11, 2021 Filed Mar 15, 2021 21:03 UTC Star Equity Holdings, Inc. HSON · Entity 7343 GrantShare Units 4,272 $0.00 $0.00
Disclosure

SEC source: 0001210708-21-000044 · wf-form4_161584215427853.xml · nonDerivative · entry 1

Diamond Matthew K · CIK 0001779155 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,272

F1 · security: Share Units credited to the Reporting Person's account under the Issuer's 2009 Incentive Stock and Awards Plan, as amended and restated, as of August 3,2020 (the "2009 Plan"). Each Share Unit is the economic equivalent of one share of Common Stock. Share Units are payable only in Common Stock.

F2 · kind: Share Units granted January 27, 2021 to the Reporting Person under the 2009 Plan for which the performance conditions to vesting were satisfied as of March 11, 2021. The Share Units are subject to time-based vesting conditions that vest 1/3 on the first anniversary of the date of grant, 1/3 on the second anniversary of the date of grant, and 1/3 on the third anniversary of the date of grant.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.