Quantumsphere Acquisition Corp
QUMS- 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; 27 institutions reported holding it in 13F filings for Q2 2026, worth $80.3M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Quantumsphere Acquisition Corp as of Mar 31, 2026. 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
- 29
- +4 vs. Q4 2025
- Shares held
- 7.56M
- +986.8K (+15.0%) vs. Q4 2025
- Total value
- $76.4M
- +$10.7M (+16.3%) vs. Q4 2025
- New holders
- 5
- 6 more added
- Sold out
- 1
- 7 more reduced
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting QUMS 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 | 27 | $80.3M |
| Q1 2026 | 29 | $76.4M |
| Q4 2025 | 25 | $65.7M |
| Q3 2025 | 4 | $8.48M |
| 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, Q1 2026
Shares, value and share of portfolio for each institution holding Quantumsphere Acquisition Corp; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Morgan Stanley | 63 | $638 | 0.00% | +33+110.0% | Added |
| Logan Stone Capital, LLC | 14,500 | $146.7K | 0.04% | 00.0% | Unchanged |
| Virtu Financial LLC | 22,303 | $226.0K | 0.01% | −2,480−10.0% | Reduced |
| Two Sigma Investments, LP | 35,291 | $357.1K | 0.00% | −182,188−83.8% | Reduced |
| Schonfeld Strategic Advisors LLC | 55,000 | $556.6K | 0.00% | 00.0% | Unchanged |
| Periscope Capital Inc. | 100,000 | $1.01M | 0.18% | −25,000−20.0% | Reduced |
| RLH Capital LLC | 100,000 | $1.01M | 0.51% | +100,000 | New |
| Crossingbridge Advisors, LLC | 107,825 | $1.09M | 0.20% | +107,825 | New |
| BNP Paribas Arbitrage, SA | 115,048 | $1.16M | 0.00% | +12,708+12.4% | Added |
| Highbridge Capital Management LLC | 121,078 | $1.23M | 0.08% | +121,078 | New |
| Heights Capital Management, Inc | 150,000 | $1.52M | 0.43% | 00.0% | Unchanged |
| Radcliffe Capital Management, L.P. | 150,000 | $1.52M | 0.11% | 00.0% | Unchanged |
| Cable Car Capital LLC | 174,801 | $1.77M | 0.61% | 00.0% | Unchanged |
| Clear Street Group Inc. | 175,001 | $1.77M | 0.01% | −249,761−58.8% | Reduced |
| Hudson Bay Capital Management LP | 235,000 | $2.38M | 0.01% | 00.0% | Unchanged |
| Westchester Capital Management, LLC | 250,000 | $2.53M | 0.12% | 00.0% | Unchanged |
| Toronto Dominion Bank | 265,600 | $2.69M | 0.01% | +89,822+51.1% | Added |
| HGC Investment Management Inc. | 300,000 | $3.04M | 0.67% | 00.0% | Unchanged |
| CNH Partners LLC | 308,294 | $3.12M | 0.05% | −14,366−4.5% | Reduced |
| Linden Advisors LP | 400,000 | $4.05M | 0.02% | 00.0% | Unchanged |
| Polar Asset Management Partners Inc. | 400,000 | $4.05M | 0.10% | +400,000 | New |
| D. E. Shaw & Co., Inc. | 409,860 | $4.15M | 0.00% | 00.0% | Unchanged |
| Glazer Capital, LLC | 423,019 | $4.28M | 0.09% | −1,134−0.3% | Reduced |
| Rivernorth Capital Management, LLC | 424,512 | $4.30M | 0.22% | +424,512 | New |
| Shaolin Capital Management LLC | 480,000 | $4.86M | 0.20% | 00.0% | Unchanged |
| Karpus Management, Inc. | 493,875 | $5.00M | 0.16% | −475−0.1% | Reduced |
| Berkley W R Corp | 508,540 | $5.15M | 0.28% | +204,960+67.5% | Added |
| Wolverine Asset Management LLC | 603,984 | $6.11M | 0.10% | +28,762+5.0% | Added |
| Mizuho Securities USA LLC | 731,984 | $7.36M | 0.17% | +13,898+1.9% | Added |
| Warberg Asset Management LLC | 0 | $0 | 0.00% | −41,421−100.0% | Sold out |