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.
13F holders, Q4 2025
Institutional positions in Quantumsphere Acquisition Corp as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 23
- +18 vs. Q3 2025
- Shares held
- 5.87M
- +4.36M (+289.0%) vs. Q3 2025
- Total value
- $1.24M
- +$1.01M (+437.1%) vs. Q3 2025
- New holders
- 19
- 2 more added
- Sold out
- 1
- 2 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting QUMSR on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 25 | $1.18M |
| Q1 2026 | 24 | $1.63M |
| Q4 2025 | 23 | $1.24M |
| Q3 2025 | 5 | $230.1K |
| Q2 2025 | 0 | $0 |
| Q1 2025 | 0 | $0 |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Quantumsphere Acquisition Corp; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Harraden Circle Investments, LLC | 993,926 | $208.8K | 0.04% | +826,426+493.4% | Added |
| Toronto Dominion Bank | 695,137 | $146.0K | 0.00% | +645,137+1,290.3% | Added |
| Highbridge Capital Management LLC | 684,037 | $143.7K | 0.01% | −15,963−2.3% | Reduced |
| Shaolin Capital Management LLC | 460,000 | $96.6K | 0.00% | +460,000 | New |
| Glazer Capital, LLC | 420,536 | $88.0K | 0.00% | +420,536 | New |
| Linden Advisors LP | 400,000 | $88.0K | 0.00% | +400,000 | New |
| CNH Partners LLC | 322,660 | $64.6K | 0.00% | +322,660 | New |
| HGC Investment Management Inc. | 300,000 | $63.0K | 0.01% | +300,000 | New |
| Clear Street Group Inc. | 229,252 | $48.2K | 0.00% | +229,252 | New |
| Cable Car Capital LLC | 174,801 | $36.7K | 0.00% | +174,801 | New |
| Radcliffe Capital Management, L.P. | 150,000 | $33.0K | 0.00% | +150,000 | New |
| Hudson Bay Capital Management LP | 150,000 | $31.5K | 0.00% | −85,000−36.2% | Reduced |
| Wolverine Asset Management LLC | 150,000 | $31.5K | 0.00% | +150,000 | New |
| Heights Capital Management, Inc | 149,900 | $31.5K | 0.01% | +149,900 | New |
| D. E. Shaw & Co., Inc. | 125,000 | $26.3K | 0.00% | +125,000 | New |
| Periscope Capital Inc. | 125,000 | $26.3K | 0.01% | +125,000 | New |
| BNP Paribas Arbitrage, SA | 102,340 | $21.5K | 0.00% | +102,340 | New |
| Boothbay Fund Management, LLC | 100,000 | $21.0K | 0.00% | +100,000 | New |
| Schonfeld Strategic Advisors LLC | 54,599 | $11.5K | 0.00% | +54,599 | New |
| Meteora Capital, LLC | 36,121 | $7.59K | 0.00% | +36,121 | New |
| Berkley W R Corp | 35,110 | $7.38K | 0.00% | +35,110 | New |
| UBS Group AG | 16,104 | $3.38K | 0.00% | +16,104 | New |
| Bank of America Corp | 100 | $21 | 0.00% | +100 | New |
| Mizuho Securities USA LLC | 0 | $0 | 0.00% | −357,801−100.0% | Sold out |