As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Hornbeck Offshore Services. The largest reported stake is Asof Hos Gp, LLC's, at 23.7%. 7 filings are on record since July 18, 2025 (Schedule 13D, September 9, 2026).
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Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 20,796,970 · Shared voting: 0 · Sole dispositive: 21,257,802 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-27
- · Reporting person: Asof Hos Gp, LLC · Sole voting: 0 · Shared voting: 61,738,413 · Sole dispositive: 0 · Shared dispositive: 61,738,413 · SCHEDULE 13D, 2026-09-09
- · Reporting person: Whitebox Advisors LLC · Sole voting: 0 · Shared voting: 37,873,696 · Sole dispositive: 0 · Shared dispositive: 37,873,696 · SCHEDULE 13G, 2026-09-09
- · Reporting person: Merced Capital, L.P. · Sole voting: 0 · Shared voting: 11,733,106 · Sole dispositive: 0 · Shared dispositive: 11,733,106 · SCHEDULE 13G, 2026-09-09
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Hornbeck Offshore Services has 7 Schedule 13D or 13G filings on record since 2025-07-18. 5 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 |
|---|---|---|---|---|
| Asof Hos Gp, LLC | 23.7% | 61,738,413 | SCHEDULE 13D, 2026-09-09 | 2026-09-01 |
| Whitebox Advisors LLC | 15% | 37,873,696 | SCHEDULE 13G, 2026-09-09 | 2026-09-01 |
| BlackRock, Inc. | 11.5% | 21,257,802 | SCHEDULE 13G/A, 2026-10-27 | 2026-09-30 |
| Dimensional Fund Advisors LP | 6% | 8,858,123 | SCHEDULE 13G/A, 2025-10-09 | 2025-09-30 |
| Merced Capital, L.P. | 5.3% | 11,733,106 | SCHEDULE 13G, 2026-09-09 | 2026-09-01 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Hornbeck Offshore Services and the records around it.
Hornbeck Offshore Services elsewhere on the record
- Leadership changes Sep 2026
- Who owns it
Companies that share a holder
- WHITEBOX ADVISORS LLC also filed stake reports on 9 other companies: KLX Energy Services Holdings, Inc. (Oct 2026), Electra Battery Materials Corp (Aug 2026), MERCER INTERNATIONAL 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)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
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What the Full Report on Hornbeck Offshore Services covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
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The Money: Funding, Valuation, Runway
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Asof Hos Gp, LLC | 0 | 61,738,413 | 0 | 61,738,413 | SCHEDULE 13D, 2026-09-09 |
| Asof Hos Aiv 1, L.P. | 0 | 4,749,024 | 0 | 4,749,024 | SCHEDULE 13D, 2026-09-09 |
| Asof Hos Aiv 2, L.P. | 0 | 18,378,512 | 0 | 18,378,512 | SCHEDULE 13D, 2026-09-09 |
| Assf Iv Hos Aiv 1, L.P. | 0 | 14,314,404 | 0 | 14,314,404 | SCHEDULE 13D, 2026-09-09 |
| Assf Iv Hos Aiv 2, L.P. | 0 | 24,296,473 | 0 | 24,296,473 | SCHEDULE 13D, 2026-09-09 |
| ASOF II A (DE) Holdings I, L.P. | 0 | 144,994 | 0 | 144,994 | SCHEDULE 13D, 2026-09-09 |
| ASOF II Holdings I, L.P. | 0 | 804,363 | 0 | 804,363 | SCHEDULE 13D, 2026-09-09 |
| ASOF Holdings I, L.P. | 0 | 2,115,351 | 0 | 2,115,351 | SCHEDULE 13D, 2026-09-09 |
| ASOF Investment Management LLC | 0 | 3,064,708 | 0 | 3,064,708 | SCHEDULE 13D, 2026-09-09 |
| ASSF IV AIV B Holdings III, L.P. | 0 | 2,344,243 | 0 | 2,344,243 | SCHEDULE 13D, 2026-09-09 |
| Assf Iv Aiv B, L.P. | 0 | 2,280,935 | 0 | 2,280,935 | SCHEDULE 13D, 2026-09-09 |
| ASSF Operating Manager IV, L.P. | 0 | 4,625,178 | 0 | 4,625,178 | SCHEDULE 13D, 2026-09-09 |
| Ares Management LLC | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Management Holdings L.P. | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Holdco LLC | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Management Corporation | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Management GP LLC | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Voting LLC | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Ares Partners Holdco LLC | 0 | 8,616,944 | 0 | 8,616,944 | SCHEDULE 13D, 2026-09-09 |
| Whitebox Advisors LLC | 0 | 37,873,696 | 0 | 37,873,696 | SCHEDULE 13G, 2026-09-09 |
| Whitebox General Partner LLC | 0 | 37,873,696 | 0 | 37,873,696 | SCHEDULE 13G, 2026-09-09 |
| Whitebox Multi-Strategy Partners, LP | 0 | 19,491,691 | 0 | 19,491,691 | SCHEDULE 13G, 2026-09-09 |
| BlackRock, Inc. | 20,796,970 | 0 | 21,257,802 | 0 | SCHEDULE 13G/A, 2026-10-27 |
| Merced Capital, L.P. | 0 | 11,733,106 | 0 | 11,733,106 | SCHEDULE 13G, 2026-09-09 |
The latest filing identifies Hornbeck Offshore Services by CUSIP 42330P107 and gives its principal executive office as 103 Northpark Boulevard, Suite 300, Covington, LA 70433 (SCHEDULE 13G/A, 2026-10-27).
What the percentages are based on
As of the date hereof, each of WA and WGP is deemed to beneficially own approximately 15.0% of the shares of Common Stock outstanding.Whitebox Advisors LLC, SCHEDULE 13G, 2026-09-09
As of September 1, 2026, each of the Reporting Persons may be deemed to be the beneficial owner of 5.3% of the outstanding shares of Common Stock (there were 222,201,763 shares of Common Stock outstanding as of September 1, 2026, according to the Issuer's transfer agent).Merced Capital, L.P., SCHEDULE 13G, 2026-09-09
Source of funds (Item 3)
The information set forth in Item 4 of this Schedule 13D is incorporated by reference into this Item 3. The securities reported herein were acquired on the Closing Date (as defined below) pursuant to the Merger Agreement (as defined below).Asof Hos Gp, LLC, SCHEDULE 13D, 2026-09-09
Purpose of Transaction (Item 4)
Asof Hos Gp, LLC
Merger On April 22, 2026, Helix Energy Solutions Group, Inc., a Minnesota corporation ("Helix"), Hornbeck Offshore Services, Inc., a Delaware corporation ("Legacy Hornbeck"), and certain subsidiaries of Helix entered into an Agreement and Plan of Merger (as it may be amended from time to time, the "Merger Agreement"), pursuant to which a wholly owned subsidiary of Helix merged with and into Legacy Hornbeck (the "first merger"), with Legacy Hornbeck surviving, and Legacy Hornbeck immediately merged with and into another wholly owned subsidiary of Helix, with that subsidiary surviving as a wholly owned subsidiary of Helix (the "Mergers"). Immediately prior to the Mergers, Helix converted from a Minnesota corporation into a Delaware corporation and, following such conversion and the Mergers, changed its name to "Hornbeck Offshore Services, Inc." The Mergers closed on September 1, 2026 (the "Closing Date"). At the effective time of the first merger (the "Effective Time"), each share of Legacy Hornbeck common stock issued and outstanding immediately before the Effective Time, other than certain excluded shares and shares as to which appraisal rights have been properly exercised, automatically converted into the right to receive 10.27167 validly issued, fully paid and nonassessable shares of the Issuer's Common Stock (the "Exchange Ratio") plus the cash value of any fractional share that was payable pursuant to the Merger Agreement. Each warrant (the "Jones Act Warrant") issued …The first part of Item 4 of the SCHEDULE 13D filed 2026-09-09; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-18 | BlackRock, Inc. | 14% | SCHEDULE 13G/A |
| 2025-10-09 | Dimensional Fund Advisors LP | 6% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-09-09 | Whitebox Advisors LLC | 15% | SCHEDULE 13G |
| 2026-09-09 | Merced Capital, L.P. | 5.3% | SCHEDULE 13G |
| 2026-09-09 | Asof Hos Gp, LLC | 23.7% | SCHEDULE 13D |
| 2026-10-27 | BlackRock, Inc. | 11.5% | SCHEDULE 13G/A |
Questions about who owns Hornbeck Offshore Services
Who owns Hornbeck Offshore Services?
On this page, 5 holders' latest ownership filings report 5% or more of Hornbeck Offshore Services: Asof Hos Gp, LLC (23.7%, Schedule 13D, filed 2026-09-09), Whitebox Advisors LLC (15%, Schedule 13G, filed 2026-09-09), BlackRock, Inc. (11.5%, Schedule 13G/A, filed 2026-10-27), Dimensional Fund Advisors LP (6%, Schedule 13G/A, filed 2025-10-09) and Merced Capital, L.P. (5.3%, Schedule 13G, filed 2026-09-09).
Who are the largest shareholders of Hornbeck Offshore Services?
By the share each holder's latest filing reports, the largest holders of Hornbeck Offshore Services on this page are Asof Hos Gp, LLC (23.7%), Whitebox Advisors LLC (15%) and BlackRock, Inc. (11.5%).
When did Asof Hos Gp, LLC buy into Hornbeck Offshore Services?
The filings give report dates, not purchase dates. The earliest filing from Asof Hos Gp, LLC on this page is the Schedule 13D, filed 2026-09-09, reporting 23.7%.
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%); 7 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.
Also on the record for Hornbeck Offshore Services
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| September 4, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| September 1, 2026 | Leadership change: Bobby Jindal appointed, Director, and 2 more | — | Leadership changes | Source |
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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.