As of November 9, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Star Equity Holdings, Inc. The largest reported stake is Jeffrey E. Eberwein's, at 30.7%. 15 filings are on record since July 29, 2025 (Schedule 13D/A, June 29, 2026).
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Key facts
- · Reporting person: Mink Brook Partners LP · Sole voting: 0 · Shared voting: 218,136 · Sole dispositive: 0 · Shared dispositive: 218,136 · SCHEDULE 13G/A, 2026-10-28
- · Reporting person: Jeffrey E. Eberwein · Sole voting: 1,149,289 · Sole dispositive: 1,149,289 · SCHEDULE 13D/A, 2026-06-29
- · Holder: Jeffrey E. Eberwein · Percent: 29.5% · SCHEDULE 13D/A
- · Holder: Jeffrey E. Eberwein · Percent: 28.3% · SCHEDULE 13D/A
- · Holder: Jeffrey E. Eberwein · Percent: 27.1% · SCHEDULE 13D/A
Star Equity Holdings, Inc. has 15 Schedule 13D or 13G filings on record since 2025-07-29. 2 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 30.7% | 1,149,289 | SCHEDULE 13D/A, 2026-06-29 | 2026-06-25 | |
| Mink Brook Capital GP LLC | 8.6% | 316,139 | SCHEDULE 13G/A, 2026-10-28 | 2026-09-30 |
| Heartland Advisors Inc | 4.9% | 170,584 | SCHEDULE 13G/A, 2025-08-28 | 2025-08-25 |
| The Vanguard Group | 4.25% | 149,018 | SCHEDULE 13G/A, 2025-10-31 | 2025-09-30 |
| Hotchkis and Wiley Capital Management, LLC | 0.34% | 11,920 | SCHEDULE 13G/A, 2025-10-07 | 2025-09-30 |
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More on Star Equity Holdings, Inc. and the records around it.
Star Equity Holdings, Inc. elsewhere on the record
Companies that share a holder
- JEFFREY E. EBERWEIN also filed stake reports on 1 other company: Reliability Incorporated (Apr 2026)
- Mink Brook Partners LP also filed stake reports on 1 other company: ASCENT INDUSTRIES CO. (Oct 2026)
- Hotchkis and Wiley Capital Management, LLC also filed stake reports on 13 other companies: Global Indemnity Group, LLC (Aug 2026), National CineMedia, Inc. (Aug 2026), Ecovyst Inc. (May 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Jeffrey E. Eberwein | 1,149,289 | — | 1,149,289 | — | SCHEDULE 13D/A, 2026-06-29 |
| Mink Brook Partners LP | 0 | 218,136 | 0 | 218,136 | SCHEDULE 13G/A, 2026-10-28 |
| Mink Brook Opportunity Fund LP | 0 | 98,003 | 0 | 98,003 | SCHEDULE 13G/A, 2026-10-28 |
| Mink Brook Capital GP LLC | 0 | 316,139 | 0 | 316,139 | SCHEDULE 13G/A, 2026-10-28 |
| William Mueller | 0 | 316,139 | 0 | 316,139 | SCHEDULE 13G/A, 2026-10-28 |
| Mink Brook Asset Management LLC | 0 | 316,139 | 0 | 316,139 | SCHEDULE 13G/A, 2026-10-28 |
The latest filing identifies Star Equity Holdings, Inc. by CUSIP 443787205 and gives its principal executive office as 53 FOREST AVENUE, OLD GREENWICH, CT 06870 (SCHEDULE 13G/A, 2026-10-28).
Source of funds (Item 3)
Item 3 is hereby amended and restated as follows: The aggregate purchase price of the 1,149,289 Shares beneficially owned by Mr. Eberwein is approximately $22,560,917, excluding brokerage commissions. In addition to the 1,149,289 Shares, Mr. Eberwein owns 765,077 shares of the Issuer's 10% Series A Cumulative Perpetual Preferred Stock.Jeffrey E. Eberwein, SCHEDULE 13D/A, 2026-06-29
Purpose of Transaction (Item 4)
Jeffrey E. Eberwein
Item 4 is hereby amended to add the following: On June 25, 2026 Mr. Eberwein (the "Seller") entered into a Rule 10b5-1 of the Securities Exchange Act of 1934 ("Exchange Act") Sales Trading Plan ("10b5-1 Sales Plan") with Ladenburg Thalmann & Co. ("Broker") for the purpose of establishing a trading plan to effect sales of shares of Series A Cumulative Perpetual Preferred Stock, par value $0.001 per share, ("Preferred Stock") of the Issuer in compliance with all applicable laws, including, without limitation, Section 10(b) of the Exchange Act and the rules and regulations promulgated thereunder, including, but not limited to, Rule 10b5-1. The Broker is authorized to begin selling Preferred Stock pursuant to the 10b5-1 Sales Plan on October 1, 2026. The 10b5-1 Sales Plan expires on October 1, 2028, unless terminated earlier under certain conditions. There can be no assurance as to how many preferred shares, if any, will be sold pursuant to the 10b5-1 Sales Plan or at what price any such shares of Preferred Stock will be sold. The Seller may in the future modify, amend, suspend, or terminate the 10b5-1 Sales Plan in its sole discretion, and the Seller does not undertake any obligation to disclose any such modification, amendment, suspension, or termination. Notwithstanding, the Broker shall not sell Preferred Stock under the 10b5-1 Sales Plan, while the Broker is selling Preferred Stock as sales agent for the Issuer's ATM offering program. A copy of the 10b5-1 Sales Plan is …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-06-29; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | Mink Brook Capital GP LLC | 10% | SCHEDULE 13G/A |
| 2025-08-13 | Hotchkis and Wiley Capital Management, LLC | 10.67% | SCHEDULE 13G/A |
| 2025-08-22 | Jeffrey E. Eberwein | 14.6% | SCHEDULE 13D/A |
| 2025-08-28 | Heartland Advisors Inc | 4.9% | SCHEDULE 13G/A |
| 2025-09-18 | Jeffrey E. Eberwein | 19.7% | SCHEDULE 13D/A |
| 2025-10-07 | Hotchkis and Wiley Capital Management, LLC | 10.67% | SCHEDULE 13G/A |
| 2025-10-07 | Hotchkis and Wiley Capital Management, LLC | 0.34% | SCHEDULE 13G/A |
| 2025-10-31 | The Vanguard Group | 4.25% | SCHEDULE 13G/A |
| 2025-11-14 | Mink Brook Capital GP LLC | 9.2% | SCHEDULE 13G/A |
| 2025-11-19 | Jeffrey E. Eberwein | 21.4% | SCHEDULE 13D/A |
| 2025-12-09 | Jeffrey E. Eberwein | 27.1% | SCHEDULE 13D/A |
| 2026-03-23 | Jeffrey E. Eberwein | 28.3% | SCHEDULE 13D/A |
| 2026-06-01 | Jeffrey E. Eberwein | 29.5% | SCHEDULE 13D/A |
| 2026-06-29 | Jeffrey E. Eberwein | 30.7% | SCHEDULE 13D/A |
| 2026-10-28 | Mink Brook Capital GP LLC | 8.6% | SCHEDULE 13G/A |
Questions about who owns Star Equity Holdings, Inc.
Who owns Star Equity Holdings, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Star Equity Holdings, Inc.: Jeffrey E. Eberwein (30.7%, Schedule 13D/A, filed 2026-06-29) and Mink Brook Capital GP LLC (8.6%, Schedule 13G/A, filed 2026-10-28).
Who are the largest shareholders of Star Equity Holdings, Inc.?
By the share each holder's latest filing reports, the largest holders of Star Equity Holdings, Inc. on this page are Jeffrey E. Eberwein (30.7%) and Mink Brook Capital GP LLC (8.6%).
When did Jeffrey E. Eberwein buy into Star Equity Holdings, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Jeffrey E. Eberwein on this page is the Schedule 13D/A, filed 2025-08-22, reporting 14.6%; its latest, Schedule 13D/A filed 2026-06-29, reports 30.7%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 15 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.