Quantumsphere AcquisitionQUMS
13F holders, Q1 2026 (March 31)29holders +4
4new positions
1sold out
1famous investor
$10.11avg. 13F price*
At the end of Q1 2026, 29 institutions reported holding Quantumsphere Acquisition Co. (QUMS) in their 13F filings, up 4 from Q4 2025. 4 opened new positions and 1 sold out. The largest holders were Mizuho Securities USA LLC ($7.4M), Wolverine Asset Management LLC ($6.1M) and Berkley W R Corp. ($5.1M). One famous investor held it David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio).
- Company
- Quantumsphere Acquisition Co.
- CUSIP
- G7387B106
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $10.7M |
| Exits | 1 | $415K |
All 13F filers, Q4 2025 → Q1 2026: 1,403,598 shares bought and 516,825 shares sold, net +886,773 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 29 holders
| Mizuho Securities USA LLC | 0.17% | Add +1.9% | 731,984 | $7.4M |
| Wolverine Asset Management LLC | 0.32% | Add +5.0% | 603,984 | $6.1M |
| Berkley W R Corp. | 0.28% | Add +67.5% | 508,540 | $5.1M |
| Karpus Management, Inc. | 0.16% | Reduce -0.1% | 493,875 | $5.0M |
| Shaolin Capital Management LLC | 0.54% | No change | 480,000 | $4.9M |
| Rivernorth Capital Management, LLC | 0.22% | New | 424,512 | $4.3M |
| Glazer Capital, LLC | 0.10% | Reduce -0.3% | 423,019 | $4.3M |
| D. E. Shaw & Co. | 0.00% | No change | 409,860 | $4.1M |
| Linden Advisors LP | 0.23% | No change | 400,000 | $4.0M |
| Polar Asset Management Partners Inc. | 0.13% | New | 400,000 | $4.0M |
| AQR Arbitrage LLC | 0.06% | Reduce -4.5% | 308,294 | $3.1M |
| HGC Investment Management Inc. | 0.68% | No change | 300,000 | $3.0M |
| Toronto Dominion Bank | 0.01% | Add +51.1% | 265,600 | $2.7M |
| Westchester Capital Management, LLC | 0.12% | No change | 250,000 | $2.5M |
| Hudson Bay Capital Management LP | 0.02% | No change | 235,000 | $2.4M |
| Clear Street Group Inc. | 0.01% | Reduce -58.8% | 175,001 | $1.8M |
| Cable Car Capital, LP | 0.76% | No change | 174,801 | $1.8M |
| Heights Capital Management, Inc. | 0.43% | No change | 150,000 | $1.5M |
| Radcliffe Capital Management, L.P. | 0.17% | No change | 150,000 | $1.5M |
| Highbridge Capital Management LLC | 0.12% | New | 121,078 | $1.2M |
| BNP Paribas Financial Markets | 0.00% | Add +12.4% | 115,048 | $1.2M |
| Crossingbridge Advisors, LLC | 0.22% | New | 107,825 | $1.1M |
| RLH Capital LLC | 0.52% | — | 100,000 | $1.0M |
| Periscope Capital Inc. | 0.18% | Reduce -20.0% | 100,000 | $1.0M |
| Schonfeld Strategic Advisors LLC | 0.00% | No change | 55,000 | $557K |
| Two Sigma Investments, LP | 0.00% | Reduce -83.8% | 35,291 | $357K |
| Virtu Financial LLC | 0.01% | Reduce -10.0% | 22,303 | $226K |
| Logan Stone Capital, LLC | 0.04% | No change | 14,500 | $147K |
| Morgan Stanley | 0.00% | Add +110.0% | 63 | $638 |
"% of holder's portfolio" is QUMS's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.