As of November 7, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of FG Imperii Acquisition Corp. The largest reported stake is Adage Capital Management, L.P.'s, at 7.82%. 8 filings are on record since January 30, 2026 (Schedule 13G, May 13, 2026).
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Key facts
- · Reporting person: Hudson Bay Capital Management LP · Sole voting: 0 · Shared voting: 1,948,264 · Sole dispositive: 0 · Shared dispositive: 1,948,264 · SCHEDULE 13G/A, 2026-11-06
- · Reporting person: AQR Capital Management, LLC · Sole voting: 0 · Shared voting: 1,211,376 · Sole dispositive: 0 · Shared dispositive: 1,211,376 · SCHEDULE 13G/A, 2026-08-12
- · Reporting person: LMR Partners LLP · Sole voting: 0 · Shared voting: 1,523,071 · Sole dispositive: 0 · Shared dispositive: 1,523,071 · SCHEDULE 13G, 2026-05-15
- · 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, 2026-05-13
- · Holder: AQR Capital Management, LLC · Percent: 5.16% · SCHEDULE 13G
FG Imperii Acquisition Corp. has 8 Schedule 13D or 13G filings on record since 2026-01-30. 5 holders' latest filing reports 5% or more of class a ordinary shares, $0.0001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Adage Capital Management, L.P. | 7.82% | 1,800,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| Hudson Bay Capital Management LP | 6.73% | 1,948,264 | SCHEDULE 13G/A, 2026-11-06 | 2026-09-30 |
| Linden Advisors LP | 6.6% | 1,500,000 | SCHEDULE 13G, 2026-01-30 | 2026-01-23 |
| LMR Partners LLP | 6.6% | 1,523,071 | SCHEDULE 13G, 2026-05-15 | 2026-03-31 |
| The Goldman Sachs Group, Inc. | 6.4% | 1,463,825 | SCHEDULE 13G, 2026-05-11 | 2026-03-31 |
| AQR Capital Management, LLC | 4.19% | 1,211,376 | SCHEDULE 13G/A, 2026-08-12 | 2026-06-30 |
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More on FG Imperii Acquisition Corp. and the records around it.
Companies that share a holder
- Hudson Bay Capital Management LP also filed stake reports on 34 other companies: Newbridge Acquisition Ltd (Nov 2026), Eos Energy Enterprises, Inc. (Nov 2026), Inflection Point Acquisition Corp. III (Nov 2026)
- LMR Partners LLP also filed stake reports on 44 other companies: BuzzFeed Inc (Aug 2026), Cartesian Growth Corp IV (Aug 2026), Collective Acquisition Corp. II (Aug 2026)
- Linden Capital L.P. also filed stake reports on 73 other companies: Southport Acquisition Corp. II (Oct 2026), NewHold Investment Corp IV (Sep 2026), Haymaker Acquisition Corp V (Sep 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 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-05-13 |
| Robert Atchinson | 0 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-05-13 |
| Phillip Gross | 0 | 1,800,000 | 0 | 1,800,000 | SCHEDULE 13G, 2026-05-13 |
| Hudson Bay Capital Management LP | 0 | 1,948,264 | 0 | 1,948,264 | SCHEDULE 13G/A, 2026-11-06 |
| Sander Gerber | 0 | 1,948,264 | 0 | 1,948,264 | SCHEDULE 13G/A, 2026-11-06 |
| LMR Partners LLP | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| LMR PARTNERS Ltd | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| LMR Partners LLC | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| LMR Partners AG | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| LMR PARTNERS (DIFC) Ltd | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| LMR Partners (Ireland) Limited | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| Ben Levine | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| Stefan Renold | 0 | 1,523,071 | 0 | 1,523,071 | SCHEDULE 13G, 2026-05-15 |
| AQR Capital Management, LLC | 0 | 1,211,376 | 0 | 1,211,376 | SCHEDULE 13G/A, 2026-08-12 |
| AQR Capital Management Holdings, LLC | 0 | 1,211,376 | 0 | 1,211,376 | SCHEDULE 13G/A, 2026-08-12 |
| AQR Arbitrage, LLC | 0 | 1,211,376 | 0 | 1,211,376 | SCHEDULE 13G/A, 2026-08-12 |
The latest filing identifies FG Imperii Acquisition Corp. by CUSIP G3R41C102 and gives its principal executive office as 104 S. Walnut Street, Unit 1A, Itasca, IL 60143 (SCHEDULE 13G/A, 2026-11-06).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-30 | Linden Advisors LP | 6.6% | SCHEDULE 13G |
| 2026-05-11 | The Goldman Sachs Group, Inc. | 6.4% | SCHEDULE 13G |
| 2026-05-11 | Hudson Bay Capital Management LP | 8.46% | SCHEDULE 13G |
| 2026-05-13 | Adage Capital Management, L.P. | 7.82% | SCHEDULE 13G |
| 2026-05-13 | AQR Capital Management, LLC | 5.16% | SCHEDULE 13G |
| 2026-05-15 | LMR Partners LLP | 6.6% | SCHEDULE 13G |
| 2026-08-12 | AQR Capital Management, LLC | 4.19% | SCHEDULE 13G/A |
| 2026-11-06 | Hudson Bay Capital Management LP | 6.73% | SCHEDULE 13G/A |
Questions about who owns FG Imperii Acquisition Corp.
Who owns FG Imperii Acquisition Corp.?
On this page, 5 holders' latest ownership filings report 5% or more of FG Imperii Acquisition Corp.: Adage Capital Management, L.P. (7.82%, Schedule 13G, filed 2026-05-13), Hudson Bay Capital Management LP (6.73%, Schedule 13G/A, filed 2026-11-06), Linden Advisors LP (6.6%, Schedule 13G, filed 2026-01-30), LMR Partners LLP (6.6%, Schedule 13G, filed 2026-05-15) and The Goldman Sachs Group, Inc. (6.4%, Schedule 13G, filed 2026-05-11).
Who are the largest shareholders of FG Imperii Acquisition Corp.?
By the share each holder's latest filing reports, the largest holders of FG Imperii Acquisition Corp. on this page are Adage Capital Management, L.P. (7.82%), Hudson Bay Capital Management LP (6.73%) and Linden Advisors LP (6.6%).
When did Adage Capital Management, L.P. buy into FG Imperii Acquisition Corp.?
The filings give report dates, not purchase dates. The earliest filing from Adage Capital Management, L.P. on this page is the Schedule 13G, filed 2026-05-13, reporting 7.82%.
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%); 8 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 FG Imperii Acquisition Corp.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| January 20, 2026 | IPO filing, Form 424B4 | — | IPO filings | Source |
| December 30, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| October 15, 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.