As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Dune Acquisition Corp II. The largest reported stake is Aristeia Capital, L.L.C.'s, at 7.6%. 7 filings are on record since August 8, 2025 (Schedule 13G, August 14, 2025).
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Key facts
- · Reporting person: Tenor Capital Management Company, L.P. · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Barclays PLC · Sole voting: 618,733 · Shared voting: 0 · Sole dispositive: 618,733 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-02-11
- · Reporting person: AQR Capital Management, LLC · Sole voting: 0 · Shared voting: 565,876 · Sole dispositive: 0 · Shared dispositive: 565,876 · SCHEDULE 13G/A, 2025-11-12
- · Holder: Barclays PLC · Percent: 7.32% · SCHEDULE 13G
- · Holder: Aristeia Capital, L.L.C. · Percent: 7.6% · SCHEDULE 13G
Dune Acquisition Corp II has 7 Schedule 13D or 13G filings on record since 2025-08-08. 2 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 |
|---|---|---|---|---|
| Aristeia Capital, L.L.C. | 7.6% | 1,100,000 | SCHEDULE 13G, 2025-08-14 | 2025-06-30 |
| Magnetar Financial LLC | 5.91% | 850,000 | SCHEDULE 13G, 2025-08-08 | 2025-06-30 |
| Barclays PLC | 4.27% | 618,733 | SCHEDULE 13G/A, 2026-02-11 | 2025-12-31 |
| AQR Capital Management, LLC | 3.91% | 565,876 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
| Tenor Capital Management Company, L.P. | 0% | 0 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
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Keep reading
More on Dune Acquisition Corp II and the records around it.
Dune Acquisition Corp II elsewhere on the record
- Leadership changes Jul 2026
Companies that share a holder
- Tenor Capital Management Company, L.P. also filed stake reports on 41 other companies: Archimedes Tech SPAC Partners II Co. (Aug 2026), Armada Acquisition Corp. II (Aug 2026), Blue Acquisition Corp. (Aug 2026)
- Aristeia Capital, L.L.C. also filed stake reports on 54 other companies: Apogee Acquisition Corp (Aug 2026), ARC Group Acquisition I Corp (Aug 2026), ClearThink 1 Acquisition Corp. (Aug 2026)
- MAGNETAR FINANCIAL LLC also filed stake reports on 97 other companies: Blue Acquisition Corp. (Sep 2026), CENTURION ACQUISITION CORP. (Sep 2026), Churchill Capital Corp IX (Sep 2026)
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The Short Answer
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What They Do, And How The Money Works
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Barclays PLC | 618,733 | 0 | 618,733 | 0 | SCHEDULE 13G/A, 2026-02-11 |
| AQR Capital Management, LLC | 0 | 565,876 | 0 | 565,876 | SCHEDULE 13G/A, 2025-11-12 |
| AQR Capital Management Holdings, LLC | 0 | 565,876 | 0 | 565,876 | SCHEDULE 13G/A, 2025-11-12 |
| AQR Arbitrage, LLC | 0 | 565,876 | 0 | 565,876 | SCHEDULE 13G/A, 2025-11-12 |
| Tenor Capital Management Company, L.P. | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Tenor Opportunity Master Fund, Ltd. | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Robin Shah | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies Dune Acquisition Corp II by CUSIP G2867S125 and gives its principal executive office as 700 S. Rosemary Avenue, Suite 204, West Palm Beach, FL 33401 (SCHEDULE 13G/A, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-08 | Magnetar Financial LLC | 5.91% | SCHEDULE 13G |
| 2025-08-12 | AQR Capital Management, LLC | 5.39% | SCHEDULE 13G |
| 2025-08-14 | Aristeia Capital, L.L.C. | 7.6% | SCHEDULE 13G |
| 2025-11-12 | Barclays PLC | 7.32% | SCHEDULE 13G |
| 2025-11-12 | AQR Capital Management, LLC | 3.91% | SCHEDULE 13G/A |
| 2026-02-11 | Barclays PLC | 4.27% | SCHEDULE 13G/A |
| 2026-08-14 | Tenor Capital Management Company, L.P. | 0% | SCHEDULE 13G/A |
Questions about who owns Dune Acquisition Corp II
Who owns Dune Acquisition Corp II?
On this page, 2 holders' latest ownership filings report 5% or more of Dune Acquisition Corp II: Aristeia Capital, L.L.C. (7.6%, Schedule 13G, filed 2025-08-14) and Magnetar Financial LLC (5.91%, Schedule 13G, filed 2025-08-08).
Who are the largest shareholders of Dune Acquisition Corp II?
By the share each holder's latest filing reports, the largest holders of Dune Acquisition Corp II on this page are Aristeia Capital, L.L.C. (7.6%) and Magnetar Financial LLC (5.91%).
When did Aristeia Capital, L.L.C. buy into Dune Acquisition Corp II?
The filings give report dates, not purchase dates. The earliest filing from Aristeia Capital, L.L.C. on this page is the Schedule 13G, filed 2025-08-14, reporting 7.6%.
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 Dune Acquisition Corp II
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| July 20, 2026 | Leadership change: Maximilian Staedtler appointed, Chief Financial Officer | — | Leadership changes | Source |
| May 8, 2025 | IPO filing, Form 424B4 | — | IPO filings | Source |
| April 29, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| March 25, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| March 7, 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.