Quantumsphere Acquisition Corp
QUMSR- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002070900
No open-market purchases or sales by Quantumsphere Acquisition Corp insiders were filed in the last 90 days; 25 institutions reported holding it in 13F filings for Q2 2026, worth $1.18M in total; no superinvestor holds it.
Q4 2025 vs. Q3 2025
How the institutions holding Quantumsphere Acquisition Corp changed between Q3 2025 and Q4 2025.
All holders in Q4 2025All holders in Q3 2025
| Measure | Q3 2025 | Q4 2025 | Change |
|---|---|---|---|
| Holders | 5 | 23 | +18 |
| Shares | 1.51M | 5.87M | +4.36M (+289.0%) |
| Value | $230.1K | $1.24M | +$1.01M (+437.1%) |
New holders (19)
Institutions that held Quantumsphere Acquisition Corp at the end of Q4 2025 but not at the end of Q3 2025.
| Institution | Shares | Value | % of portfolio |
|---|---|---|---|
| Shaolin Capital Management LLC | 460,000 | $96.6K | 0.00% |
| Glazer Capital, LLC | 420,536 | $88.0K | 0.00% |
| Linden Advisors LP | 400,000 | $88.0K | 0.00% |
| CNH Partners LLC | 322,660 | $64.6K | 0.00% |
| HGC Investment Management Inc. | 300,000 | $63.0K | 0.01% |
| Clear Street Group Inc. | 229,252 | $48.2K | 0.00% |
| Cable Car Capital LLC | 174,801 | $36.7K | 0.00% |
| Radcliffe Capital Management, L.P. | 150,000 | $33.0K | 0.00% |
| Wolverine Asset Management LLC | 150,000 | $31.5K | 0.00% |
| Heights Capital Management, Inc | 149,900 | $31.5K | 0.01% |
| D. E. Shaw & Co., Inc. | 125,000 | $26.3K | 0.00% |
| Periscope Capital Inc. | 125,000 | $26.3K | 0.01% |
| BNP Paribas Arbitrage, SA | 102,340 | $21.5K | 0.00% |
| Boothbay Fund Management, LLC | 100,000 | $21.0K | 0.00% |
| Schonfeld Strategic Advisors LLC | 54,599 | $11.5K | 0.00% |
| Meteora Capital, LLC | 36,121 | $7.59K | 0.00% |
| Berkley W R Corp | 35,110 | $7.38K | 0.00% |
| UBS Group AG | 16,104 | $3.38K | 0.00% |
| Bank of America Corp | 100 | $21 | 0.00% |
Sold out (1)
Institutions that held Quantumsphere Acquisition Corp at the end of Q3 2025 and filed for Q4 2025 without it.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| Mizuho Securities USA LLC | 357,801 | $6.14K |