Quantumsphere Acquisition Corporation
Ownership
Ownership Structure
Who owns Quantumsphere Acquisition Corporation (QUMS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 72.6% of the shares are freely tradable; institutional investors hold 74.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Mizuho Securities USA Inc | 6.42 | 731,984 | +1.9 | 03/31/2026 |
| Wolverine Asset Management LLC | 5.30 | 603,984 | +5.0 | 03/31/2026 |
| Berkley W R Corp | 4.46 | 508,540 | +67.5 | 03/31/2026 |
| Karpus Management Inc | 4.33 | 493,875 | -0.1 | 03/31/2026 |
| Shaolin Capital Management LLC | 4.21 | 480,000 | +0.0 | 03/31/2026 |
| RiverNorth Capital Management, LLC | 3.72 | 424,124 | -0.1 | 06/30/2026 |
| D. E. Shaw & Co LP | 3.59 | 409,860 | +0.0 | 06/30/2026 |
| Glazer Capital, LLC | 3.51 | 400,089 | -5.4 | 06/30/2026 |
| Linden Advisors LLC | 3.51 | 400,000 | +0.0 | 06/30/2026 |
| Polar Asset Management Partners | 3.51 | 400,000 | +0.0 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 24, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.