🕵️ Quantumsphere Acquisition Corp ($QUMS)
SEC insider & ownership activity, last 12 months · CIK 2070900 · every row links its SEC filing
Insiders were quiet over the last 12 months – no open-market buys or sells. No red-flag 8-Ks in the window.
Insider flow
0 buyers, $0 (0 lots) · 0 sellers, $0 (0 lots)
No open-market insider transactions in the last 12 months.
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Whiteowl Holdings LLC | 27.4% | 13D | Aug 5, 2025 | filing ↗ | |
| Mizuho Financial Group, Inc. | 6.3% | 13G | Feb 12, 2026 | filing ↗ | |
| Wolverine Asset Management LLC | 5.0% | 13G | Nov 7, 2025 | filing ↗ | |
| Wolverine Trading Partners, Inc. | 5.0% | 13G | Nov 7, 2025 | filing ↗ | |
| Wolverine Holdings, L.P. | 5.0% | 13G | Nov 7, 2025 | filing ↗ | |
| Christopher L. Gust | 5.0% | 13G | Nov 7, 2025 | filing ↗ | |
| Robert R. Bellick | 5.0% | 13G | Nov 7, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Material agreement (1.01) | Jan 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 13, 2026 | filing ↗ |
| Material agreement (1.01) | Oct 3, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 3, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 3, 2025 | filing ↗ |
| Other events (8.01) | Sep 26, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 26, 2025 | filing ↗ |
| Other events (8.01) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |
| Other events (8.01) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |
| Material agreement (1.01) | Aug 5, 2025 | filing ↗ |
| Unregistered equity sale (3.02) | Aug 5, 2025 | filing ↗ |
| Officer/director changes (5.02) | Aug 5, 2025 | filing ↗ |
| Charter/bylaw changes (5.03) | Aug 5, 2025 | filing ↗ |
| Other events (8.01) | Aug 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2025 | filing ↗ |