Quantumsphere Acquisition Corp has 6 Schedule 13D or 13G filings on record since 2025-09-15. 4 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 |
|---|---|---|---|---|
| Whiteowl Holdings LLC | 27.41% | 3,126,650 | SCHEDULE 13D, 2025-09-15 | 2025-08-05 |
| W. R. Berkley Corporation | 7.7% | 881,402 | SCHEDULE 13G, 2026-08-06 | 2026-06-30 |
| Mizuho Financial Group, Inc. | 6.3% | 718,086 | SCHEDULE 13G, 2026-02-12 | 2025-12-31 |
| Wolverine Asset Management LLC | 5.03% | 574,171 | SCHEDULE 13G, 2025-11-07 | 2025-10-31 |
| Highbridge Capital Management, LLC | 0% | 0 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
Purpose of Transaction (Item 4)
Whiteowl Holdings LLC
In connection with the organization of the Issuer, on August 29, 2024, pursuant to a Subscription Agreement, the Issuer issued an aggregate of 2,875,000 ordinary shares as Founder Shares, to the Sponsor for an aggregate purchase price of $25,000. On May 6, 2025, our Sponsor surrendered 460,000 founder shares for no consideration to us for cancellation and as a result, our Sponsor held 2,415,000 founder shares as of May 6, 2025. On August 5, 2025, the Issuer and the Sponsor entered into the First Amendment to the Subscription Agreement, pursuant to which the purchased amount of shares was adjusted to 2,898,000 ordinary shares, of which 378,000 are subject to forfeiture if the underwriters' over-allotment option is not exercised in full. Simultaneously with the consummation of the Issuer's initial public offering, the Sponsor purchased 228,650 units ("Placement Units") of the Issuer at $10.00 per Placement Unit, as more fully described in Item 6 of this Schedule 13D, which information is incorporated herein by reference. Each Placement Unit consists of one ordinary share and one right to receive one-seventh (1/7) of one ordinary share upon the consummation of the Issuer's initial business combination (as described more fully in the Issuer's Final Prospectus dated August 7, 2025). On July 25, 2025, the Sponsor and its member entered into the First Amendment to the Operating Agreement, whereby 83.13% of the Sponsor's interest was transferred to Wealthwise Solutions LTD, making …The first part of Item 4 of the SCHEDULE 13D filed 2025-09-15; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-09-15 | Whiteowl Holdings LLC | 27.41% | SCHEDULE 13D |
| 2025-11-07 | Wolverine Asset Management LLC | 5.03% | SCHEDULE 13G |
| 2025-11-14 | Highbridge Capital Management LLC | 5.3% | SCHEDULE 13G |
| 2026-02-12 | Mizuho Financial Group, Inc. | 6.3% | SCHEDULE 13G |
| 2026-02-17 | Highbridge Capital Management, LLC | 0% | SCHEDULE 13G/A |
| 2026-08-06 | W. R. Berkley Corporation | 7.7% | SCHEDULE 13G |
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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.