As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Pioneer Acquisition I Corp. The largest reported stake is Barclays PLC's, at 5.93%. 6 filings are on record since August 13, 2025 (Schedule 13G, November 12, 2025).
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Key facts
- · Reporting person: D. E. Shaw & Co., L.P. · Sole voting: 0 · Shared voting: 1,252,350 · Sole dispositive: 0 · Shared dispositive: 1,252,350 · SCHEDULE 13G, 2026-05-15
- · Reporting person: Westchester Capital Management, LLC · Sole voting: 95,758 · Shared voting: 1,152,746 · Sole dispositive: 95,758 · Shared dispositive: 1,152,746 · SCHEDULE 13G, 2026-05-15
- · Reporting person: Glazer Capital, LLC · Sole voting: 0 · Shared voting: 1,210,643 · Sole dispositive: 0 · Shared dispositive: 1,210,643 · SCHEDULE 13G, 2026-05-14
- · Reporting person: Barclays PLC · Sole voting: 1,500,755 · Shared voting: 0 · Sole dispositive: 1,500,755 · Shared dispositive: 0 · SCHEDULE 13G, 2025-11-12
- · Holder: AQR Capital Management, LLC · Percent: 3.89% · SCHEDULE 13G/A
Pioneer Acquisition I Corp has 6 Schedule 13D or 13G filings on record since 2025-08-13. 4 holders' latest filing reports 5% or more of class a ordinary shares, $0.0001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Barclays PLC | 5.93% | 1,500,755 | SCHEDULE 13G, 2025-11-12 | 2025-09-30 |
| D. E. Shaw & Co., L.P. | 5.7% | 1,252,350 | SCHEDULE 13G, 2026-05-15 | 2026-03-31 |
| Westchester Capital Management, LLC | 5.65% | 1,248,504 | SCHEDULE 13G, 2026-05-15 | 2026-03-31 |
| Glazer Capital, LLC | 5.47% | 1,210,643 | SCHEDULE 13G, 2026-05-14 | 2026-03-31 |
| AQR Capital Management, LLC | 3.89% | 984,608 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
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More on Pioneer Acquisition I Corp and the records around it.
Pioneer Acquisition I Corp elsewhere on the record
- Leadership changes Jun 2026
Companies that share a holder
- D. E. Shaw & Co., L.P. also filed stake reports on 28 other companies: Gossamer Bio, Inc. (Oct 2026), Sweetgreen, Inc. (Oct 2026), Venture Global, Inc. (Sep 2026)
- Westchester Capital Management, LLC also filed stake reports on 31 other companies: Lakeshore Acquisition III Corp. (Aug 2026), Sizzle Acquisition Corp. II (Aug 2026), Tavia Acquisition Corp. (Aug 2026)
- Glazer Capital, LLC also filed stake reports on 107 other companies: Bumble Inc (Oct 2026), Weave Communications Inc (Oct 2026), Utz Brands Inc (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Barclays PLC | 1,500,755 | 0 | 1,500,755 | 0 | SCHEDULE 13G, 2025-11-12 |
| D. E. Shaw & Co., L.P. | 0 | 1,252,350 | 0 | 1,252,350 | SCHEDULE 13G, 2026-05-15 |
| D. E. Shaw & Co., L.L.C. | 0 | 1,252,350 | 0 | 1,252,350 | SCHEDULE 13G, 2026-05-15 |
| D. E. Shaw Valence Portfolios, L.L.C. | 0 | 1,252,350 | 0 | 1,252,350 | SCHEDULE 13G, 2026-05-15 |
| David E. Shaw | 0 | 1,252,350 | 0 | 1,252,350 | SCHEDULE 13G, 2026-05-15 |
| Westchester Capital Management, LLC | 95,758 | 1,152,746 | 95,758 | 1,152,746 | SCHEDULE 13G, 2026-05-15 |
| Westchester Capital Partners, LLC | 10,108 | 0 | 10,108 | 0 | SCHEDULE 13G, 2026-05-15 |
| Virtus Investment Advisers, LLC | 0 | 1,152,746 | 0 | 1,152,746 | SCHEDULE 13G, 2026-05-15 |
| Glazer Capital, LLC | 0 | 1,210,643 | 0 | 1,210,643 | SCHEDULE 13G, 2026-05-14 |
| Paul J. Glazer | 0 | 1,210,643 | 0 | 1,210,643 | SCHEDULE 13G, 2026-05-14 |
The latest filing identifies Pioneer Acquisition I Corp by CUSIP G7117W107 and gives its principal executive office as 131 Concord Street, Brooklyn, NY 11201 (SCHEDULE 13G, 2026-05-15).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-13 | AQR Capital Management, LLC | 5.11% | SCHEDULE 13G |
| 2025-11-12 | Barclays PLC | 5.93% | SCHEDULE 13G |
| 2025-11-12 | AQR Capital Management, LLC | 3.89% | SCHEDULE 13G/A |
| 2026-05-14 | Glazer Capital, LLC | 5.47% | SCHEDULE 13G |
| 2026-05-15 | D. E. Shaw & Co., L.P. | 5.7% | SCHEDULE 13G |
| 2026-05-15 | Westchester Capital Management, LLC | 5.65% | SCHEDULE 13G |
Questions about who owns Pioneer Acquisition I Corp
Who owns Pioneer Acquisition I Corp?
On this page, 4 holders' latest ownership filings report 5% or more of Pioneer Acquisition I Corp: Barclays PLC (5.93%, Schedule 13G, filed 2025-11-12), D. E. Shaw & Co., L.P. (5.7%, Schedule 13G, filed 2026-05-15), Westchester Capital Management, LLC (5.65%, Schedule 13G, filed 2026-05-15) and Glazer Capital, LLC (5.47%, Schedule 13G, filed 2026-05-14).
Who are the largest shareholders of Pioneer Acquisition I Corp?
By the share each holder's latest filing reports, the largest holders of Pioneer Acquisition I Corp on this page are Barclays PLC (5.93%), D. E. Shaw & Co., L.P. (5.7%) and Westchester Capital Management, LLC (5.65%).
When did Barclays PLC buy into Pioneer Acquisition I Corp?
The filings give report dates, not purchase dates. The earliest filing from Barclays PLC on this page is the Schedule 13G, filed 2025-11-12, reporting 5.93%.
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%); 6 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 Pioneer Acquisition I Corp
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| June 23, 2026 | Leadership change: Adeel Rouf appointed, Director | — | Leadership changes | Source |
| June 20, 2025 | IPO filing, Form 424B4 | — | IPO filings | Source |
| June 16, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| June 11, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| May 29, 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.