As of November 10, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of SEACOR Marine Holdings Inc. The largest reported stake is Chernett Jorey's, at 7.19%. 10 filings are on record since July 29, 2025 (Schedule 13D, June 22, 2026).
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Key facts
- · Reporting person: P. Oppenheimer Investment Parternship, LP · Sole voting: 530,010 · Shared voting: 0 · Sole dispositive: 530,010 · Shared dispositive: 0 · SCHEDULE 13G, 2026-11-02
- · Holder: Carl K. Oppenheimer · Percent: 5.1% · SCHEDULE 13G
- · Holder: Chernett Jorey · Percent: 7.19% · Shares: 1,946,963 · SCHEDULE 13D
- · Holder: Chernett Jorey · Percent: 6.9% · SCHEDULE 13G/A
- · Holder: Carl K. Oppenheimer · Percent: 5.24% · SCHEDULE 13G
SEACOR Marine Holdings Inc. has 10 Schedule 13D or 13G filings on record since 2025-07-29. 2 holders' latest filing reports 5% or more of common stock, par value $.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 7.19% | 1,946,963 | SCHEDULE 13D, 2026-06-22 | 2026-06-22 | |
| 5.1% | 1,383,057 | SCHEDULE 13G, 2026-11-02 | 2026-09-30 | |
| Dimensional Fund Advisors LP | 4.8% | 1,284,004 | SCHEDULE 13G/A, 2026-01-21 | 2025-12-31 |
| The Vanguard Group | 4.57% | 1,235,033 | SCHEDULE 13G/A, 2025-10-30 | 2025-09-30 |
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More on SEACOR Marine Holdings Inc. and the records around it.
SEACOR Marine Holdings Inc. elsewhere on the record
Companies that share a holder
- P. Oppenheimer Investment Parternship, LP also filed stake reports on 3 other companies: Hurco Companies, Inc. (Nov 2026), Gouverneur Bancorp, Inc. (Feb 2026)
- Chernett Jorey also filed stake reports on 16 other companies: CVRx, Inc. (Oct 2026), WW INTERNATIONAL, INC. (Aug 2026), Neuronetics, Inc. (Aug 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
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What the Full Report on SEACOR Marine Holdings Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Chernett Jorey | 1,946,963 | 0 | 1,946,963 | 0 | SCHEDULE 13D, 2026-06-22 |
| P. Oppenheimer Investment Parternship, LP | 530,010 | 0 | 530,010 | 0 | SCHEDULE 13G, 2026-11-02 |
| Oppenheimer-Close Investment Partnership, LP | 147,961 | 0 | 147,961 | 0 | SCHEDULE 13G, 2026-11-02 |
| Oppenheimer + Close, LLC | 102,766 | 0 | 102,766 | 0 | SCHEDULE 13G, 2026-11-02 |
| Oppvest, LLC | 677,971 | 0 | 677,971 | 0 | SCHEDULE 13G, 2026-11-02 |
| Carl K. Oppenheimer | 780,737 | 0 | 780,737 | 0 | SCHEDULE 13G, 2026-11-02 |
The latest filing identifies SEACOR Marine Holdings Inc. by CUSIP 78413P101 and gives its principal executive office as 12121 Wickchester Lane, Suite 500, Houston, TX 77079 (SCHEDULE 13G, 2026-11-02).
Source of funds (Item 3)
The 1,946,963 Shares held by Mr. Chernett were acquired through private transactions using personal funds in the amount of $12,717,562.Chernett Jorey, SCHEDULE 13D, 2026-06-22
Purpose of Transaction (Item 4)
Chernett Jorey
The Reporting Person purchased the Shares based on the Reporting Person's belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Person, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Person may endeavor to further increase or decrease his position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Person may deem advisable. The Reporting Person does not have any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein. The Reporting Person intends to review his investment in the Issuer on a continuing basis. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Person may in the future take such actions with respect to his investment in the Issuer as he deems appropriate including, without limitation, engaging in …The first part of Item 4 of the SCHEDULE 13D filed 2026-06-22; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 5.03% | SCHEDULE 13G |
| 2025-10-30 | The Vanguard Group | 4.57% | SCHEDULE 13G/A |
| 2025-11-14 | Chernett Jorey | 4.5% | SCHEDULE 13G/A |
| 2025-12-31 | Chernett Jorey | 5.2% | SCHEDULE 13G |
| 2026-01-21 | Dimensional Fund Advisors LP | 4.8% | SCHEDULE 13G/A |
| 2026-04-21 | Carl K. Oppenheimer | 5.24% | SCHEDULE 13G |
| 2026-05-20 | Chernett Jorey | 6.9% | SCHEDULE 13G/A |
| 2026-06-22 | Chernett Jorey | 7.19% | SCHEDULE 13D |
| 2026-08-11 | Carl K. Oppenheimer | 5.1% | SCHEDULE 13G |
| 2026-11-02 | Carl K. Oppenheimer | 5.1% | SCHEDULE 13G |
Questions about who owns SEACOR Marine Holdings Inc.
Who owns SEACOR Marine Holdings Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of SEACOR Marine Holdings Inc.: Chernett Jorey (7.19%, Schedule 13D, filed 2026-06-22) and Carl K. Oppenheimer (5.1%, Schedule 13G, filed 2026-11-02).
Who are the largest shareholders of SEACOR Marine Holdings Inc.?
By the share each holder's latest filing reports, the largest holders of SEACOR Marine Holdings Inc. on this page are Chernett Jorey (7.19%) and Carl K. Oppenheimer (5.1%).
When did Chernett Jorey buy into SEACOR Marine Holdings Inc.?
The filings give report dates, not purchase dates. The earliest filing from Chernett Jorey on this page is the Schedule 13G/A, filed 2025-11-14, reporting 4.5%; its latest, Schedule 13D filed 2026-06-22, reports 7.19%. 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%); 10 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.