As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of OneIM Acquisition Corp. The largest reported stake is OneIM Sponsor LLC's, at 20.3%. 7 filings are on record since January 23, 2026 (Schedule 13G, April 15, 2026).
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Key facts
- · Reporting person: Saba Capital Management, L.P. · Sole voting: 0 · Shared voting: 1,001,863 · Sole dispositive: 0 · Shared dispositive: 1,001,863 · SCHEDULE 13G/A, 2026-08-13
- · Reporting person: RP Investment Advisors LP · Sole voting: 0 · Shared voting: 1,812,994 · Sole dispositive: 0 · Shared dispositive: 1,812,994 · SCHEDULE 13G, 2026-06-18
- · Holder: Saba Capital Management, L.P. · Percent: 6.43% · SCHEDULE 13G/A
- · Reporting person: Adage Capital Management, L.P. · Sole voting: 0 · Shared voting: 2,250,000 · Sole dispositive: 0 · Shared dispositive: 2,250,000 · SCHEDULE 13G, 2026-05-13
- · Holder: OneIM Sponsor LLC · Percent: 20.3% · SCHEDULE 13G
OneIM Acquisition Corp. has 7 Schedule 13D or 13G filings on record since 2026-01-23. 4 holders' latest filing reports 5% or more of common shares, par value $0.0001. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| OneIM Sponsor LLC | 20.3% | 7,337,500 | SCHEDULE 13G, 2026-04-15 | 2026-01-13 |
| Adage Capital Management, L.P. | 7.83% | 2,250,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| RP Investment Advisors LP | 6.3% | 1,812,994 | SCHEDULE 13G, 2026-06-18 | 2026-06-11 |
| Sculptor Capital LP | 5.05% | 1,462,253 | SCHEDULE 13G, 2026-03-05 | 2026-03-03 |
| Saba Capital Management, L.P. | 3.46% | 1,001,863 | SCHEDULE 13G/A, 2026-08-13 | 2026-06-30 |
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More on OneIM Acquisition Corp. and the records around it.
Companies that share a holder
- RP Investment Advisors LP also filed stake reports on 17 other companies: Yorkville International Capital Corp. (Sep 2026), Amanat Acquisition Corp. (Aug 2026), ProCap Acquisition Corp (Aug 2026)
- Sculptor Capital LP also filed stake reports on 40 other companies: Helix Acquisition Corp. III (Oct 2026), Live Oak Acquisition Corp. VI (Oct 2026), Amanat Acquisition Corp (Aug 2026)
- Saba Capital Management, L.P. also filed stake reports on 69 other companies: BlackRock TCP Capital Corp. (Nov 2026), Ellsworth Growth and Income Fund Ltd. (Nov 2026), Virtus Total Return Fund Inc. (Nov 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Adage Capital Management, L.P. | 0 | 2,250,000 | 0 | 2,250,000 | SCHEDULE 13G, 2026-05-13 |
| Robert Atchinson | 0 | 2,250,000 | 0 | 2,250,000 | SCHEDULE 13G, 2026-05-13 |
| Phillip Gross | 0 | 2,250,000 | 0 | 2,250,000 | SCHEDULE 13G, 2026-05-13 |
| RP Investment Advisors LP | 0 | 1,812,994 | 0 | 1,812,994 | SCHEDULE 13G, 2026-06-18 |
| RP Select Opportunities Master Fund Ltd. | 0 | 875,762 | 0 | 875,762 | SCHEDULE 13G, 2026-06-18 |
| RP Debt Opportunities Fund Ltd. | 0 | 271,119 | 0 | 271,119 | SCHEDULE 13G, 2026-06-18 |
| RP Alternative Global Bond Fund | 0 | 538,478 | 0 | 538,478 | SCHEDULE 13G, 2026-06-18 |
| RP Alternative Credit Opportunities Fund | 0 | 127,635 | 0 | 127,635 | SCHEDULE 13G, 2026-06-18 |
| Saba Capital Management, L.P. | 0 | 1,001,863 | 0 | 1,001,863 | SCHEDULE 13G/A, 2026-08-13 |
| Boaz R. Weinstein | 0 | 1,001,863 | 0 | 1,001,863 | SCHEDULE 13G/A, 2026-08-13 |
| Saba Capital Management GP, LLC | 0 | 1,001,863 | 0 | 1,001,863 | SCHEDULE 13G/A, 2026-08-13 |
The latest filing identifies OneIM Acquisition Corp. by CUSIP G6S74K122 and gives its principal executive office as 11th Floor, 390 Park Avenue, New York, NY 10022 (SCHEDULE 13G/A, 2026-08-13).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-23 | Saba Capital Management, L.P. | 8.34% | SCHEDULE 13G |
| 2026-03-05 | Sculptor Capital LP | 5.05% | SCHEDULE 13G |
| 2026-04-15 | OneIM Sponsor LLC | 20.3% | SCHEDULE 13G |
| 2026-05-13 | Adage Capital Management, L.P. | 7.83% | SCHEDULE 13G |
| 2026-05-15 | Saba Capital Management, L.P. | 6.43% | SCHEDULE 13G/A |
| 2026-06-18 | RP Investment Advisors LP | 6.3% | SCHEDULE 13G |
| 2026-08-13 | Saba Capital Management, L.P. | 3.46% | SCHEDULE 13G/A |
Questions about who owns OneIM Acquisition Corp.
Who owns OneIM Acquisition Corp.?
On this page, 4 holders' latest ownership filings report 5% or more of OneIM Acquisition Corp.: OneIM Sponsor LLC (20.3%, Schedule 13G, filed 2026-04-15), Adage Capital Management, L.P. (7.83%, Schedule 13G, filed 2026-05-13), RP Investment Advisors LP (6.3%, Schedule 13G, filed 2026-06-18) and Sculptor Capital LP (5.05%, Schedule 13G, filed 2026-03-05).
Who are the largest shareholders of OneIM Acquisition Corp.?
By the share each holder's latest filing reports, the largest holders of OneIM Acquisition Corp. on this page are OneIM Sponsor LLC (20.3%), Adage Capital Management, L.P. (7.83%) and RP Investment Advisors LP (6.3%).
When did OneIM Sponsor LLC buy into OneIM Acquisition Corp.?
The filings give report dates, not purchase dates. The earliest filing from OneIM Sponsor LLC on this page is the Schedule 13G, filed 2026-04-15, reporting 20.3%.
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 OneIM Acquisition Corp.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| January 14, 2026 | IPO filing, Form 424B4 | — | IPO filings | Source |
| January 2, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| December 22, 2025 | IPO filing, Form S-1 | — | IPO filings | 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.