Stock
Quantumsphere Acquisition Co
Ticker not mapped · held by 29 managers
Reported value
$71.9M
Holders
29
+4 new · −1 exited
Holders’ est. mark
$625.6K
Price effect on 24 books still in the name
Largest holder
$7.36M
MIZUHO SECURITIES USA LLC
Holder count by quarter
Who holds it
Notable only| Investor | Shares | Value | Est. mark | Change |
|---|---|---|---|---|
| MIZUHO SECURITIES USA LLC | 732K | $7.36M | $87.8K | Added$227.5K |
| WOLVERINE ASSET MANAGEMENT LLC | 604K | $6.11M | $63.3K | Added$354.3K |
| BERKLEY W R CORP | 508.5K | $5.15M | $33.4K | Added$2.11M |
| Karpus Management, Inc. | 493.9K | $5M | $54.3K | Added$49.6K |
| Shaolin Capital Management LLC | 480K | $4.86M | $52.8K | Added$52.8K |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 424.5K | $4.3M | — | New |
| D. E. Shaw & Co., Inc. | 409.9K | $4.15M | $45.1K | Added$45.1K |
| Polar Asset Management Partners Inc. | 400K | $4.05M | — | New |
| Linden Advisors LP | 400K | $4.05M | $44K | Added$44K |
| AQR Arbitrage LLC | 308.3K | $3.12M | $33.9K | Cut−$109.9K |
| HGC Investment Management Inc. | 300K | $3.04M | $33K | Added$33K |
| TORONTO DOMINION BANK | 265.6K | $2.69M | $19.3K | Added$928.3K |
| Westchester Capital Management, LLC | 250K | $2.53M | $27.5K | Added$27.5K |
| Hudson Bay Capital Management LP | 235K | $2.38M | $25.8K | Added$25.9K |
| Clear Street Group Inc. | 175K | $1.77M | $19.2K | Cut−$2.48M |
| Cable Car Capital, LP | 174.8K | $1.77M | $19.2K | Added$19.2K |
| HEIGHTS CAPITAL MANAGEMENT, INC | 150K | $1.52M | $16.5K | Added$16.5K |
| Radcliffe Capital Management, L.P. | 150K | $1.52M | $16.5K | Added$16.5K |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | 121.1K | $1.23M | — | New |
| BNP PARIBAS FINANCIAL MARKETS | 115K | $1.16M | $11.3K | Added$139.9K |
| Crossingbridge Advisors, LLC | 107.8K | $1.09M | — | New |
| RLH Capital LLC | 100K | $1.01M | — | Held |
| Periscope Capital Inc. | 100K | $1.01M | $11K | Cut−$239.3K |
| Schonfeld Strategic Advisors LLC | 55K | $556.6K | $6.05K | Added$6.05K |
| TWO SIGMA INVESTMENTS, LP | 35.3K | $357.1K | $3.88K | Cut−$1.82M |
| Logan Stone Capital, LLC | 14.5K | $146.7K | $1.59K | Added$1.59K |
| Glazer Capital, LLC | 423K | $4.28K | $46 | Added$35 |
| MORGAN STANLEY | 63 | $638 | $4 | Added$338 |
| Virtu Financial LLC | 22.3K | $226 | $3 | Cut−$22 |
Who left
- Warberg Asset Management LLC$414.6K
Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.