Quantumsphere AcquisitionQUMS
13F holders, Q2 2026 (June 30)27holders −2
1new positions
3sold out
1famous investor
$10.22avg. 13F price*
At the end of Q2 2026, 27 institutions reported holding Quantumsphere Acquisition Co. (QUMS) in their 13F filings, down 2 from Q1 2026. 1 opened new positions and 3 sold out. The largest holders were Berkley W R Corp. ($9.0M), Mizuho Securities USA LLC ($7.7M) and Wolverine Asset Management LLC ($6.2M). 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 Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 1 | $767K |
| Exits | 3 | $3.6M |
All 13F filers, Q1 2026 → Q2 2026: 983,659 shares bought and 680,974 shares sold, net +302,685 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 27 holders
| Berkley W R Corp. | 0.44% | Add +73.3% | 881,402 | $9.0M |
| Mizuho Securities USA LLC | 0.12% | Add +3.4% | 757,023 | $7.7M |
| Wolverine Asset Management LLC | 0.32% | Reduce -0.2% | 602,984 | $6.2M |
| Karpus Management, Inc. | 0.14% | Reduce -4.9% | 469,875 | $4.8M |
| Rivernorth Capital Management, LLC | 0.21% | Reduce -0.1% | 424,124 | $4.4M |
| D. E. Shaw & Co. | 0.00% | No change | 409,860 | $4.2M |
| Shaolin Capital Management LLC | 0.47% | Reduce -15.5% | 405,761 | $4.1M |
| Glazer Capital, LLC | 0.10% | Reduce -5.4% | 400,089 | $4.1M |
| Linden Advisors LP | 0.18% | No change | 400,000 | $4.1M |
| Polar Asset Management Partners Inc. | 0.10% | No change | 400,000 | $4.1M |
| Highbridge Capital Management LLC | 0.26% | Add +211.9% | 377,607 | $3.9M |
| Westchester Capital Management, LLC | 0.18% | Add +40.0% | 350,000 | $3.6M |
| AQR Arbitrage LLC | 0.06% | Add +1.4% | 312,523 | $3.2M |
| RLH Capital LLC | 1.23% | Add +150.0% | 250,000 | $2.6M |
| Hudson Bay Capital Management LP | 0.01% | No change | 235,000 | $2.4M |
| Cable Car Capital, LP | 0.04% | No change | 174,801 | $1.8M |
| Clear Street Group Inc. | 0.01% | Reduce -5.8% | 164,793 | $1.7M |
| Heights Capital Management, Inc. | 0.36% | No change | 150,000 | $1.5M |
| Radcliffe Capital Management, L.P. | 0.16% | No change | 150,000 | $1.5M |
| BNP Paribas Financial Markets | 0.00% | No change | 115,048 | $1.2M |
| Crossingbridge Advisors, LLC | 0.21% | No change | 107,825 | $1.1M |
| Toronto Dominion Bank | 0.00% | Reduce -62.4% | 100,000 | $1.0M |
| Periscope Capital Inc. | 0.13% | Reduce -25.0% | 75,000 | $767K |
| Quarry LP | 0.12% | New | 75,000 | $767K |
| Schonfeld Strategic Advisors LLC | 0.00% | No change | 55,000 | $562K |
| Logan Stone Capital, LLC | 0.03% | Reduce -0.0% | 14,495 | $148K |
| Morgan Stanley | 0.00% | Reduce -15.9% | 53 | $542 |
"% of holder's portfolio" is QUMS's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.