As of November 9, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Nine Energy Service, Inc. The largest reported stake is Philosophy Capital Management LLC's, at 17%. 11 filings are on record since February 6, 2026 (Schedule 13G/A, August 14, 2026).
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Key facts
- · Reporting person: Philosophy Capital Management LLC · Sole voting: 0 · Shared voting: 2,377,783 · Sole dispositive: 0 · Shared dispositive: 2,377,783 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Jeffrey L. Gendell · Sole voting: 0 · Shared voting: 614,230 · Sole dispositive: 0 · Shared dispositive: 614,230 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Adage Capital Management, L.P. · Sole voting: 0 · Shared voting: 1,355,149 · Sole dispositive: 0 · Shared dispositive: 1,355,149 · SCHEDULE 13G, 2026-07-09
- · Reporting person: Algebris Investments (US) Inc. · Sole voting: 832,907 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-02
- · Holder: Jeffrey L. Gendell · Percent: 5.6% · SCHEDULE 13G
Nine Energy Service, Inc. has 11 Schedule 13D or 13G filings on record since 2026-02-06. 5 holders' latest filing reports 5% or more of common stock, par value $0.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Philosophy Capital Management LLC | 17% | 2,377,783 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| MacKay Shields LLC | 11.91% | 1,662,134 | SCHEDULE 13G, 2026-03-31 | 2026-03-05 |
| Adage Capital Management, L.P. | 9.71% | 1,355,149 | SCHEDULE 13G, 2026-07-09 | 2026-03-31 |
| CastleKnight Master Fund LP | 8.3% | 1,157,943 | SCHEDULE 13G, 2026-04-09 | 2026-03-31 |
| Algebris Investments (US) Inc. | 6% | 832,907 | SCHEDULE 13G, 2026-07-02 | 2026-06-30 |
| 4.4% | 614,230 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 | |
| 0.3% | 140,000 | SCHEDULE 13G/A, 2026-04-16 | 2025-12-31 |
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More on Nine Energy Service, Inc. and the records around it.
Nine Energy Service, Inc. elsewhere on the record
Companies that share a holder
- Philosophy Capital Management LLC also filed stake reports on 1 other company: Hudson Pacific Properties, Inc. (Aug 2026)
- Jeffrey L. Gendell also filed stake reports on 7 other companies: IF Bancorp, Inc. (May 2026), Avadel Pharmaceuticals plc (Feb 2026), Drilling Tools International Corp (Feb 2026)
- CastleKnight Master Fund LP also filed stake reports on 17 other companies: Suja Life, Inc. (Aug 2026), Advantage Solutions Inc. (Aug 2026), HAIN CELESTIAL GROUP INC (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Philosophy Capital Management LLC | 0 | 2,377,783 | 0 | 2,377,783 | SCHEDULE 13G/A, 2026-08-14 |
| Philosophy Capital Partners, LP | 0 | 890,005 | 0 | 890,005 | SCHEDULE 13G/A, 2026-08-14 |
| Jacob Rubin | 0 | 2,377,783 | 0 | 2,377,783 | SCHEDULE 13G/A, 2026-08-14 |
| Adage Capital Management, L.P. | 0 | 1,355,149 | 0 | 1,355,149 | SCHEDULE 13G, 2026-07-09 |
| Robert Atchinson | 0 | 1,355,149 | 0 | 1,355,149 | SCHEDULE 13G, 2026-07-09 |
| Phillip Gross | 0 | 1,355,149 | 0 | 1,355,149 | SCHEDULE 13G, 2026-07-09 |
| Algebris Investments (US) Inc. | 832,907 | 0 | 0 | 0 | SCHEDULE 13G, 2026-07-02 |
| Jeffrey L. Gendell | 0 | 614,230 | 0 | 614,230 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies Nine Energy Service, Inc. by CUSIP 65441V200 and gives its principal executive office as 2001 Kirby Drive, Suite 200, Houston, TX 77019 (SCHEDULE 13G/A, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-06 | Tontine Asset Associates, LLC | 0% | SCHEDULE 13G/A |
| 2026-03-11 | Philosophy Capital Management LLC | 18.3% | SCHEDULE 13G |
| 2026-03-31 | MacKay Shields LLC | 11.91% | SCHEDULE 13G |
| 2026-03-31 | MacKay Shields LLC | 11.91% | SCHEDULE 13G |
| 2026-04-09 | CastleKnight Master Fund LP | 8.3% | SCHEDULE 13G |
| 2026-04-16 | Monroe William | 0.3% | SCHEDULE 13G/A |
| 2026-05-15 | Jeffrey L. Gendell | 5.6% | SCHEDULE 13G |
| 2026-07-02 | Algebris Investments (US) Inc. | 6% | SCHEDULE 13G |
| 2026-07-09 | Adage Capital Management, L.P. | 9.71% | SCHEDULE 13G |
| 2026-08-14 | Philosophy Capital Management LLC | 17% | SCHEDULE 13G/A |
| 2026-08-14 | Jeffrey L. Gendell | 4.4% | SCHEDULE 13G/A |
Questions about who owns Nine Energy Service, Inc.
Who owns Nine Energy Service, Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of Nine Energy Service, Inc.: Philosophy Capital Management LLC (17%, Schedule 13G/A, filed 2026-08-14), MacKay Shields LLC (11.91%, Schedule 13G, filed 2026-03-31), Adage Capital Management, L.P. (9.71%, Schedule 13G, filed 2026-07-09), CastleKnight Master Fund LP (8.3%, Schedule 13G, filed 2026-04-09) and Algebris Investments (US) Inc. (6%, Schedule 13G, filed 2026-07-02).
Who are the largest shareholders of Nine Energy Service, Inc.?
By the share each holder's latest filing reports, the largest holders of Nine Energy Service, Inc. on this page are Philosophy Capital Management LLC (17%), MacKay Shields LLC (11.91%) and Adage Capital Management, L.P. (9.71%).
When did Philosophy Capital Management LLC buy into Nine Energy Service, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Philosophy Capital Management LLC on this page is the Schedule 13G, filed 2026-03-11, reporting 18.3%; its latest, Schedule 13G/A filed 2026-08-14, reports 17%.
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%); 11 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 Nine Energy Service, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| May 22, 2026 | Leadership change: Heather Schmidt appointed, Chief Financial Officer | — | Leadership changes | Source |
| May 15, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| April 24, 2026 | Leadership change: Guy Sirkes departs, Chief Financial Officer, and 1 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.