Institutional Ownership
Quantumsphere Acquisition Co
CUSIP G7387B106ORD SHSQ1 2026
13D / 13G Filings
5
Schedule 13D/13G on record
Beneficial Filers
5
Distinct reporting persons
Largest Stake
27.4%
Max % of class reported
Institutional Holders
29
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
5 filings · latest Feb 17, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 17, 2026 | Highbridge Capital Management, LLC | 13G/A | — | 49 | SEC |
| 2 | Feb 12, 2026 | Mizuho Financial Group, Inc. | 13G | 6.3% | 718.1K | SEC |
| 3 | Nov 14, 2025 | Highbridge Capital Management LLC | 13G | 5.3% | 600.0K | SEC |
| 4 | Nov 7, 2025 | Wolverine Asset Management LLC | 13G | 5.0% | 574.2K | SEC |
| 5 | Sep 15, 2025 | Whiteowl Holdings LLC | 13D | 27.4% | — | SEC |
Top Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Mizuho Securities USA LLC | 732.0K | $7.36M |
| 2 | Wolverine Asset Management LLC | 604.0K | $6.11M |
| 3 | Berkley W R Corp | 508.5K | $5.15M |
| 4 | Karpus Management, Inc. | 493.9K | $5.00M |
| 5 | Shaolin Capital Management LLC | 480.0K | $4.86M |
| 6 | Rivernorth Capital Management, LLC | 424.5K | $4.30M |
| 7 | D. E. Shaw & Co., Inc. | 409.9K | $4.15M |
| 8 | Linden Advisors LP | 400.0K | $4.05M |
| 9 | Polar Asset Management Partners Inc. | 400.0K | $4.05M |
| 10 | Aqr Arbitrage LLC | 308.3K | $3.12M |