Quantumsphere AcquisitionQUMS
13F holders, Q4 2025 (December 31)25holders +21
6new positions
1sold out
1famous investor
$10.00avg. 13F price*
At the end of Q4 2025, 25 institutions reported holding Quantumsphere Acquisition Co. (QUMS) in their 13F filings, up 21 from Q3 2025. 6 opened new positions and 1 sold out. The largest holders were Mizuho Securities USA LLC ($7.1M), Wolverine Asset Management LLC ($5.8M) and Karpus Management, Inc. ($4.9M). 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 Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 6 | $19.5M |
| Exits | 1 | $6.0M |
All 13F filers, Q3 2025 → Q4 2025: 3,258,681 shares bought and 822,719 shares sold, net +2,435,962 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 25 holders
| Mizuho Securities USA LLC | 0.12% | New | 718,086 | $7.1M |
| Wolverine Asset Management LLC | 0.34% | Add +283.5% | 575,222 | $5.8M |
| Karpus Management, Inc. | 0.15% | New | 494,350 | $4.9M |
| Shaolin Capital Management LLC | 0.63% | New | 480,000 | $4.8M |
| Clear Street Group Inc. | 0.02% | Add +30261.8% | 424,762 | $4.3M |
| Glazer Capital, LLC | 0.13% | Add +0.9% | 424,153 | $4.2M |
| D. E. Shaw & Co. | 0.00% | Add +227.9% | 409,860 | $4.1M |
| Linden Advisors LP | 0.30% | No change | 400,000 | $4.0M |
| AQR Arbitrage LLC | 0.09% | No change | 322,660 | $3.2M |
| Berkley W R Corp. | 0.17% | Add +104.1% | 303,580 | $3.0M |
| HGC Investment Management Inc. | 0.64% | No change | 300,000 | $3.0M |
| Westchester Capital Management, LLC | 0.12% | New | 250,000 | $2.5M |
| Hudson Bay Capital Management LP | 0.01% | No change | 235,000 | $2.4M |
| Two Sigma Investments, LP | 0.00% | Reduce -2.3% | 217,479 | $2.2M |
| Toronto Dominion Bank | 0.00% | Reduce -51.3% | 175,778 | $1.8M |
| Cable Car Capital, LP | 0.11% | No change | 174,801 | $1.7M |
| Heights Capital Management, Inc. | 0.57% | No change | 150,000 | $1.5M |
| Radcliffe Capital Management, L.P. | 0.21% | No change | 150,000 | $1.5M |
| Periscope Capital Inc. | 0.26% | No change | 125,000 | $1.3M |
| BNP Paribas Financial Markets | 0.00% | No change | 102,340 | $1.0M |
| Schonfeld Strategic Advisors LLC | 0.00% | Reduce -37.1% | 55,000 | $551K |
| Warberg Asset Management LLC | 1.32% | No change | 41,421 | $415K |
| Virtu Financial LLC | 0.01% | Add +66.0% | 24,783 | $248K |
| Logan Stone Capital, LLC | 0.04% | New | 14,500 | $145K |
| Morgan Stanley | 0.00% | New | 30 | $300 |
"% of holder's portfolio" is QUMS's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.