As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Blue Water Acquisition Corp. Iv. The largest reported stake is Blue Water Acquisition IV LLC's, at 27.8%. 4 filings are on record since April 9, 2026 (Schedule 13G, April 15, 2026).
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Key facts
- · Reporting person: Adage Capital Management, L.P. · Sole voting: 0 · Shared voting: 1,125,000 · Sole dispositive: 0 · Shared dispositive: 1,125,000 · SCHEDULE 13G, 2026-05-13
- · Reporting person: Magnetar Financial LLC · Sole voting: 0 · Shared voting: 950,000 · Sole dispositive: 0 · Shared dispositive: 950,000 · SCHEDULE 13G, 2026-05-13
- · Reporting person: Blue Water Acquisition IV LLC · Sole voting: 5,066,667 · Shared voting: 0 · Sole dispositive: 5,066,667 · Shared dispositive: 0 · SCHEDULE 13G, 2026-04-15
- · Reporting person: Wealthspring Capital LLC · Sole voting: 0 · Shared voting: 675,757 · Sole dispositive: 0 · Shared dispositive: 675,757 · SCHEDULE 13G, 2026-04-09
Blue Water Acquisition Corp. Iv has 4 Schedule 13D or 13G filings on record since 2026-04-09. 4 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 |
|---|---|---|---|---|
| Blue Water Acquisition IV LLC | 27.8% | 5,066,667 | SCHEDULE 13G, 2026-04-15 | 2026-03-19 |
| Adage Capital Management, L.P. | 8.38% | 1,125,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| Magnetar Financial LLC | 7.07% | 950,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| Wealthspring Capital LLC | 5.2% | 675,757 | SCHEDULE 13G, 2026-04-09 | 2026-03-31 |
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More on Blue Water Acquisition Corp. Iv and the records around it.
Blue Water Acquisition Corp. Iv elsewhere on the record
- Leadership changes Aug 2026
Companies that share a holder
- Wealthspring Capital LLC also filed stake reports on 17 other companies: Lionheart Holdings (Oct 2026), AmperCap Acquisition Company (Jul 2026), CENTURION ACQUISITION CORP (Jul 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)
- 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 Blue Water Acquisition Corp. Iv covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Blue Water Acquisition IV LLC | 5,066,667 | 0 | 5,066,667 | 0 | SCHEDULE 13G, 2026-04-15 |
| Joseph Hernandez | 5,066,667 | 0 | 5,066,667 | 0 | SCHEDULE 13G, 2026-04-15 |
| Adage Capital Management, L.P. | 0 | 1,125,000 | 0 | 1,125,000 | SCHEDULE 13G, 2026-05-13 |
| Robert Atchinson | 0 | 1,125,000 | 0 | 1,125,000 | SCHEDULE 13G, 2026-05-13 |
| Phillip Gross | 0 | 1,125,000 | 0 | 1,125,000 | SCHEDULE 13G, 2026-05-13 |
| Magnetar Financial LLC | 0 | 950,000 | 0 | 950,000 | SCHEDULE 13G, 2026-05-13 |
| Magnetar Capital Partners LP | 0 | 950,000 | 0 | 950,000 | SCHEDULE 13G, 2026-05-13 |
| Supernova Management LLC | 0 | 950,000 | 0 | 950,000 | SCHEDULE 13G, 2026-05-13 |
| David J. Snyderman | 0 | 950,000 | 0 | 950,000 | SCHEDULE 13G, 2026-05-13 |
| Wealthspring Capital LLC | 0 | 675,757 | 0 | 675,757 | SCHEDULE 13G, 2026-04-09 |
| Matthew Simpson | 0 | 675,757 | 0 | 675,757 | SCHEDULE 13G, 2026-04-09 |
The latest filing identifies Blue Water Acquisition Corp. Iv by CUSIP G1368A120 and gives its principal executive office as 15 E. Putnam Avenue, Suite 363, Greenwich, CT 06830 (SCHEDULE 13G, 2026-05-13).
What the percentages are based on
27.8% (based on 18,216,667 Ordinary Shares outstanding as reported in the Issuer's Balance Sheet as of March 23, 2026 filed as Exhibit 99.1 to Form 8-K filed on March 27, 2026).Blue Water Acquisition IV LLC, SCHEDULE 13G, 2026-04-15
As of March 31, 2026, each of the Reporting Persons were deemed to be the beneficial owner constituting approximately 7.07% of the total number of shares outstanding (based upon the information provided by the Issuer in the Form 8-K filed on March 19, 2026 there were approximately 13,425,000 Shares outstanding).Magnetar Financial LLC, SCHEDULE 13G, 2026-05-13
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-04-09 | Wealthspring Capital LLC | 5.2% | SCHEDULE 13G |
| 2026-04-15 | Blue Water Acquisition IV LLC | 27.8% | SCHEDULE 13G |
| 2026-05-13 | Adage Capital Management, L.P. | 8.38% | SCHEDULE 13G |
| 2026-05-13 | Magnetar Financial LLC | 7.07% | SCHEDULE 13G |
Questions about who owns Blue Water Acquisition Corp. Iv
Who owns Blue Water Acquisition Corp. Iv?
On this page, 4 holders' latest ownership filings report 5% or more of Blue Water Acquisition Corp. Iv: Blue Water Acquisition IV LLC (27.8%, Schedule 13G, filed 2026-04-15), Adage Capital Management, L.P. (8.38%, Schedule 13G, filed 2026-05-13), Magnetar Financial LLC (7.07%, Schedule 13G, filed 2026-05-13) and Wealthspring Capital LLC (5.2%, Schedule 13G, filed 2026-04-09).
Who are the largest shareholders of Blue Water Acquisition Corp. Iv?
By the share each holder's latest filing reports, the largest holders of Blue Water Acquisition Corp. Iv on this page are Blue Water Acquisition IV LLC (27.8%), Adage Capital Management, L.P. (8.38%) and Magnetar Financial LLC (7.07%).
When did Blue Water Acquisition IV LLC buy into Blue Water Acquisition Corp. Iv?
The filings give report dates, not purchase dates. The earliest filing from Blue Water Acquisition IV LLC on this page is the Schedule 13G, filed 2026-04-15, reporting 27.8%.
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 Blue Water Acquisition Corp. Iv
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 18, 2026 | Leadership change: Nadab Akhtar appointed, Director | — | Leadership changes | Source |
| May 14, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| March 20, 2026 | IPO filing, Form 424B4 | $10 a share | IPO filings | Source |
| March 11, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| February 24, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| December 5, 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.