Quantumsphere AcquisitionQUMSRPreferred / convertible
13F holders, Q3 2025 (September 30)5holders
$0.15avg. 13F price*
At the end of Q3 2025, 5 institutions reported holding Quantumsphere Acquisition Co. (QUMSR) in their 13F filings. The largest holders were Highbridge Capital Management LLC ($133K), Hudson Bay Capital Management LP ($45K) and Harraden Circle Investments, LLC ($32K).
- Company
- Quantumsphere Acquisition Co.
- CUSIP
- G7387B114
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 5 | $230K |
| Exits | 0 | $0 |
Ownership 5 holders
| Highbridge Capital Management LLC | — | New | 700,000 | $133K |
| Hudson Bay Capital Management LP | — | New | 235,000 | $45K |
| Harraden Circle Investments, LLC | — | New | 167,500 | $32K |
| Toronto Dominion Bank | — | New | 50,000 | $15K |
| Mizuho Securities USA LLC | — | New | 357,801 | $6K |
"% of holder's portfolio" is QUMSR's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.