Quantumsphere AcquisitionQUMSRPreferred / convertible
13F holders, Q2 2026 (June 30)25holders +1
1new positions
0sold out
1famous investor
$0.18avg. 13F price*
At the end of Q2 2026, 25 institutions reported holding Quantumsphere Acquisition Co. (QUMSR) in their 13F filings, up 1 from Q1 2026. 1 opened new positions and 0 sold out. The largest holders were Harraden Circle Investments, LLC ($198K), Toronto Dominion Bank ($143K) and Shaolin Capital Management LLC ($95K). One famous investor held it David E. Shaw ( of D. E. Shaw & Co.'s portfolio).
- Company
- Quantumsphere Acquisition Co.
- CUSIP
- G7387B114
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 1 | $12K |
| Exits | 0 | $0 |
All 13F filers, Q1 2026 → Q2 2026: 169,693 shares bought and 430,264 shares sold, net −260,571 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 25 holders
| Harraden Circle Investments, LLC | — | No change | 993,926 | $198K |
| Toronto Dominion Bank | — | Add +7.0% | 717,905 | $143K |
| Shaolin Capital Management LLC | — | Add +4.2% | 479,379 | $95K |
| Glazer Capital, LLC | — | No change | 420,536 | $68K |
| Rivernorth Capital Management, LLC | — | No change | 424,512 | $66K |
| AQR Arbitrage LLC | — | Add +1.0% | 324,248 | $65K |
| Linden Advisors LP | — | No change | 400,000 | $64K |
| Polar Asset Management Partners Inc. | — | No change | 400,000 | $64K |
| HGC Investment Management Inc. | — | No change | 300,000 | $60K |
| Highbridge Capital Management LLC | — | Reduce -55.5% | 307,316 | $52K |
| Clear Street Group Inc. | — | Reduce -0.9% | 222,380 | $44K |
| Cable Car Capital, LP | — | No change | 174,801 | $35K |
| RLH Capital LLC | — | No change | 184,900 | $30K |
| Wolverine Asset Management LLC | — | Reduce -2.0% | 132,552 | $26K |
| Hudson Bay Capital Management LP | — | No change | 150,000 | $26K |
| Radcliffe Capital Management, L.P. | — | No change | 150,000 | $24K |
| Heights Capital Management, Inc. | — | Reduce -22.6% | 106,968 | $21K |
| D. E. Shaw & Co. | — | No change | 125,000 | $21K |
| Periscope Capital Inc. | — | No change | 125,000 | $20K |
| BNP Paribas Financial Markets | — | No change | 102,340 | $16K |
| Boothbay Fund Management, LLC | — | No change | 100,000 | $16K |
| Westchester Capital Management, LLC | — | New | 100,000 | $12K |
| Schonfeld Strategic Advisors LLC | — | Reduce -0.6% | 54,200 | $9K |
| Berkley W R Corp. | — | Reduce -31.3% | 24,108 | $4K |
| UBS Group AG | — | No change | 16,027 | $2K |
"% of holder's portfolio" is QUMSR's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.