QUMSNasdaqBlank ChecksFiscal year ends March 31Also trades as QUMSR, QUMSU
Quantumsphere Acquisition Corp
Financials through Q1 FY2027, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 14, 2026
$10.38+0.00 (0.00%)
Close on Oct 19, 2026
- Market cap
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- P/E (TTM)
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- Dividend yield
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Ownership
Who owns Quantumsphere Acquisition's shares
Held by institutions
–
Shares held, 13F filers
Institutional holders
–
Net institutional buying
–
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| W. R. Berkley Corporation | 881,402 | 7.70% | 13G (passive) | Jun 30, 2026 |
| Mizuho Financial Group, Inc. | 718,086 | 6.30% | 13G (passive) | Dec 31, 2025 |
| Highbridge Capital Management LLC | 600,000 | 5.30% | 13G (passive) | Sep 30, 2025 |
| Wolverine Holdings, L.P. | 574,171 | 5.03% | 13G (passive) | Oct 31, 2025 |
| Whiteowl Holdings LLC | 3,126,650 | 27.41% | 13D (active) | Aug 5, 2025 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | Latest filing |
|---|---|---|---|
| Ping Zhang | Chairman, CEO, and CFO, Director | 3,126,650 | Aug 11, 2025 |
| Daniel M. McCabe | Director | – | Aug 12, 2025 |
| Qi Gong | Director | – | Aug 11, 2025 |
| Wei Zhang | Director | – | Aug 11, 2025 |
| Holdings LLC Whiteowl | 10% owner | 3,126,650 | Aug 11, 2025 |