Quantumsphere AcquisitionQUMSU
13F holders, Q2 2026 (June 30)7holders −1
0new positions
1sold out
$10.32avg. 13F price*
At the end of Q2 2026, 7 institutions reported holding Quantumsphere Acquisition Co. (QUMSU) in their 13F filings, down 1 from Q1 2026. 0 opened new positions and 1 sold out. The largest holders were GABELLI & Co INVESTMENT ADVISERS, INC. ($699K), Gabelli Funds LLC ($592K) and HRT Financial LP ($309K).
- Company
- Quantumsphere Acquisition Co.
- CUSIP
- G7387B122
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 0 | $0 |
| Exits | 1 | $1.0M |
All 13F filers, Q1 2026 → Q2 2026: 699 shares bought and 100,138 shares sold, net −99,439 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 7 holders
| GABELLI & Co INVESTMENT ADVISERS, INC. | 0.10% | No change | 67,700 | $699K |
| Gabelli Funds LLC | 0.00% | No change | 57,300 | $592K |
| HRT Financial LP | 0.00% | Reduce -0.5% | 30,000 | $309K |
| Clear Street Group Inc. | 0.00% | Add +3.0% | 23,142 | $239K |
| JPMorgan Chase & Co. | 0.00% | No change | 10,000 | $103K |
| UBS Group AG | 0.00% | Add +3.2% | 479 | $5K |
| Glazer Capital, LLC | 0.00% | Add +0.9% | 221 | $2K |
"% of holder's portfolio" is QUMSU's weight in each manager's 13F, not the share of Quantumsphere Acquisition Co. the manager owns.