As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of KPET Ultra Paceline Corporation. The largest reported stake is KPThree Capital LLC's, at 20.2%. 4 filings are on record since April 7, 2026 (Schedule 13G, May 14, 2026).
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Key facts
- · Reporting person: Adage Capital Management, L.P. · Sole voting: 0 · Shared voting: 1,800,000 · Sole dispositive: 0 · Shared dispositive: 1,800,000 · SCHEDULE 13G, 2026-08-12
- · Reporting person: KPET Ultra Paceline LLC · Sole voting: 0 · Shared voting: 5,630,000 · Sole dispositive: 0 · Shared dispositive: 5,630,000 · SCHEDULE 13G, 2026-05-14
- · Reporting person: RP Investment Advisors LP · Sole voting: 0 · Shared voting: 1,250,000 · Sole dispositive: 0 · Shared dispositive: 1,250,000 · SCHEDULE 13G, 2026-05-13
- · Reporting person: Sculptor Capital LP · Sole voting: 0 · Shared voting: 1,200,000 · Sole dispositive: 0 · Shared dispositive: 1,200,000 · SCHEDULE 13G, 2026-04-07
KPET Ultra Paceline Corporation has 4 Schedule 13D or 13G filings on record since 2026-04-07. 4 holders' latest filing reports 5% or more of class a ordinary shares, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| KPThree Capital LLC | 20.2% | 5,865,000 | SCHEDULE 13G, 2026-05-14 | 2026-03-31 |
| Adage Capital Management, L.P. | 7.75% | 1,800,000 | SCHEDULE 13G, 2026-08-12 | 2026-06-30 |
| Sculptor Capital LP | 5.93% | 1,200,000 | SCHEDULE 13G, 2026-04-07 | 2026-04-01 |
| RP Investment Advisors LP | 5.4% | 1,250,000 | SCHEDULE 13G, 2026-05-13 | 2026-05-11 |
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More on KPET Ultra Paceline Corporation 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)
- Adage Capital Management, L.P. also filed stake reports on 136 other companies: ACP Holdings Acquisition Corp. (Aug 2026), AmperCap Acquisition Company (Aug 2026), Aura Biosciences, Inc. (Aug 2026)
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What the Full Report on KPET Ultra Paceline Corporation covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| KPET Ultra Paceline LLC | 0 | 5,630,000 | 0 | 5,630,000 | SCHEDULE 13G, 2026-05-14 |
| KPThree Capital LLC | 0 | 5,865,000 | 0 | 5,865,000 | SCHEDULE 13G, 2026-05-14 |
| Karl Peterson | 0 | 5,865,000 | 0 | 5,865,000 | SCHEDULE 13G, 2026-05-14 |
| Eduardo Tamraz | 0 | 5,630,000 | 0 | 5,630,000 | SCHEDULE 13G, 2026-05-14 |
| Adage Capital Management, L.P. | 0 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-08-12 |
| Robert Atchinson | 0 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-08-12 |
| Phillip Gross | 0 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-08-12 |
| Sculptor Capital LP | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| Sculptor Capital II LP | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| Sculptor Capital Holding Corp | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| Sculptor Capital Holding II LLC | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| Sculptor Capital Management, Inc. | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| Sculptor Master Fund, Ltd. | 0 | 1,200,000 | 0 | 1,200,000 | SCHEDULE 13G, 2026-04-07 |
| RP Investment Advisors LP | 0 | 1,250,000 | 0 | 1,250,000 | SCHEDULE 13G, 2026-05-13 |
| RP Select Opportunities Master Fund Ltd. | 0 | 760,125 | 0 | 760,125 | SCHEDULE 13G, 2026-05-13 |
| RP Debt Opportunities Fund Ltd. | 0 | 148,125 | 0 | 148,125 | SCHEDULE 13G, 2026-05-13 |
| RP Alternative Global Bond Fund | 0 | 281,125 | 0 | 281,125 | SCHEDULE 13G, 2026-05-13 |
| RP Alternative Credit Opportunities Fund | 0 | 60,625 | 0 | 60,625 | SCHEDULE 13G, 2026-05-13 |
The latest filing identifies KPET Ultra Paceline Corporation by CUSIP G53157106 and gives its principal executive office as 5109 S. Broadband Lane, Sioux Falls, SD 57108 (SCHEDULE 13G, 2026-08-12).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-04-07 | Sculptor Capital LP | 5.93% | SCHEDULE 13G |
| 2026-05-13 | RP Investment Advisors LP | 5.4% | SCHEDULE 13G |
| 2026-05-14 | KPThree Capital LLC | 20.2% | SCHEDULE 13G |
| 2026-08-12 | Adage Capital Management, L.P. | 7.75% | SCHEDULE 13G |
Questions about who owns KPET Ultra Paceline Corporation
Who owns KPET Ultra Paceline Corporation?
On this page, 4 holders' latest ownership filings report 5% or more of KPET Ultra Paceline Corporation: KPThree Capital LLC (20.2%, Schedule 13G, filed 2026-05-14), Adage Capital Management, L.P. (7.75%, Schedule 13G, filed 2026-08-12), Sculptor Capital LP (5.93%, Schedule 13G, filed 2026-04-07) and RP Investment Advisors LP (5.4%, Schedule 13G, filed 2026-05-13).
Who are the largest shareholders of KPET Ultra Paceline Corporation?
By the share each holder's latest filing reports, the largest holders of KPET Ultra Paceline Corporation on this page are KPThree Capital LLC (20.2%), Adage Capital Management, L.P. (7.75%) and Sculptor Capital LP (5.93%).
When did KPThree Capital LLC buy into KPET Ultra Paceline Corporation?
The filings give report dates, not purchase dates. The earliest filing from KPThree Capital LLC on this page is the Schedule 13G, filed 2026-05-14, reporting 20.2%.
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%); 4 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 KPET Ultra Paceline Corporation
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| April 2, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| April 1, 2026 | IPO filing, Form 424B4 | $10 a share | IPO filings | Source |
| March 24, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| March 5, 2026 | 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.