As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Proem Acquisition Corp I. The largest reported stake is Proem SPAC Partners I LLC's, at 26.1%. 6 filings are on record since February 18, 2026 (Schedule 13D, March 4, 2026).
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Key facts
- · Holder: Polar Asset Management Partners Inc. · Percent: 6.5% · SCHEDULE 13G
- · Holder: Aristeia Capital, L.L.C. · Percent: 5.66% · SCHEDULE 13G
- · Holder: Magnetar Financial LLC · Percent: 5.44% · SCHEDULE 13G
- · Holder: Proem SPAC Partners I LLC · Percent: 26.1% · SCHEDULE 13D
- · Holder: Millennium Management LLC · Percent: 4.1% · SCHEDULE 13G
Proem Acquisition Corp I has 6 Schedule 13D or 13G filings on record since 2026-02-18. 5 holders' latest filing reports 5% or more of class a ordinary 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 |
|---|---|---|---|---|
| Proem SPAC Partners I LLC | 26.1% | 4,625,833 | SCHEDULE 13D, 2026-03-04 | 2026-02-13 |
| Linden Advisors LP | 7.5% | 1,000,000 | SCHEDULE 13G, 2026-02-18 | 2026-02-17 |
| Polar Asset Management Partners Inc. | 6.5% | 1,200,000 | SCHEDULE 13G, 2026-05-15 | 2026-03-31 |
| Aristeia Capital, L.L.C. | 5.66% | 1,040,000 | SCHEDULE 13G, 2026-05-14 | 2026-03-31 |
| Magnetar Financial LLC | 5.44% | 1,000,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| Millennium Management LLC | 4.1% | 752,500 | SCHEDULE 13G, 2026-02-20 | 2026-02-12 |
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More on Proem Acquisition Corp I and the records around it.
Companies that share a holder
- 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)
- Polar Asset Management Partners Inc. also filed stake reports on 69 other companies: Aeon Acquisition I Corp. (Aug 2026), Bitcoin Depot Inc. (Aug 2026), ACP Holdings Acquisition Corp. (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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Purpose of Transaction (Item 4)
Proem SPAC Partners I LLC
Founder Shares In connection with the organization of the Issuer, in August 2025, the Sponsor paid $25,000 to cover certain of the Issuer's initial public offering costs in exchange for 4,983,333 ordinary shares, (the "Founder Shares"), for approximately $0.005 per share. Up to 650,000 of the founder shares will be surrendered for no consideration depending on the extent to which the underwriters' over-allotment is exercised. See Issuer's registration statement on Form S-1 (File No. 333-292217, the "Registration Statement"), under the heading "Certain Relationships and Related Party Transactions." Public Units On February 13, 2026, the Company closed its initial public offering of 13,000,000 units, at a price of $10.00 per unit (the "Public Units"), for an aggregate purchase price of $130,000,000. Each Public Unit consists of one ordinary share and one-half of one redeemable warrant (each, a "warrant"). Each whole warrant entitles the holder thereof to purchase one ordinary share at a price of $11.50 per share, subject to adjustment (as described more fully in the Registration Statement). Private Placement Units On February 13, 2026, simultaneously with the closing of the Issuer's IPO, the Sponsor acquired 292,500 private placement units ("Private Placement Units" and, together with the Public Units, the "Units") at $10.00 per Private Placement Unit, for an aggregate purchase price of $2,925,000, pursuant to a Private Placement Units Purchase Agreements dated February …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-04; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-18 | Linden Advisors LP | 7.5% | SCHEDULE 13G |
| 2026-02-20 | Millennium Management LLC | 4.1% | SCHEDULE 13G |
| 2026-03-04 | Proem SPAC Partners I LLC | 26.1% | SCHEDULE 13D |
| 2026-05-13 | Magnetar Financial LLC | 5.44% | SCHEDULE 13G |
| 2026-05-14 | Aristeia Capital, L.L.C. | 5.66% | SCHEDULE 13G |
| 2026-05-15 | Polar Asset Management Partners Inc. | 6.5% | SCHEDULE 13G |
Questions about who owns Proem Acquisition Corp I
Who owns Proem Acquisition Corp I?
On this page, 5 holders' latest ownership filings report 5% or more of Proem Acquisition Corp I: Proem SPAC Partners I LLC (26.1%, Schedule 13D, filed 2026-03-04), Linden Advisors LP (7.5%, Schedule 13G, filed 2026-02-18), Polar Asset Management Partners Inc. (6.5%, Schedule 13G, filed 2026-05-15), Aristeia Capital, L.L.C. (5.66%, Schedule 13G, filed 2026-05-14) and Magnetar Financial LLC (5.44%, Schedule 13G, filed 2026-05-13).
Who are the largest shareholders of Proem Acquisition Corp I?
By the share each holder's latest filing reports, the largest holders of Proem Acquisition Corp I on this page are Proem SPAC Partners I LLC (26.1%), Linden Advisors LP (7.5%) and Polar Asset Management Partners Inc. (6.5%).
When did Proem SPAC Partners I LLC buy into Proem Acquisition Corp I?
The filings give report dates, not purchase dates. The earliest filing from Proem SPAC Partners I LLC on this page is the Schedule 13D, filed 2026-03-04, reporting 26.1%.
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 Proem Acquisition Corp I
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| February 13, 2026 | IPO filing, Form 424B4 | — | IPO filings | Source |
| January 29, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| January 15, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| December 18, 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.