Who Owns QUANTUMSPHERE ACQUISITION CO (QUMSR)? -- Institutional Holders (2026-06-30)
25 institutions reported holding $1.2M of QUANTUMSPHERE ACQUISITION CO (QUMSR) in SEC 13F filings for 2026-06-30. Largest institutional holders: Harraden Circle Investments, LLC ($197,791), TORONTO DOMINION BANK ($142,863), Shaolin Capital Management LLC ($95,396), GLAZER CAPITAL, LLC ($68,000), RIVERNORTH CAPITAL MANAGEMENT, LLC ($65,842). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | Harraden Circle Investments, LLC | $197,791 | 993,926 | Hold |
| 2 | TORONTO DOMINION BANK | $142,863 | 717,905 | Added |
| 3 | Shaolin Capital Management LLC | $95,396 | 479,379 | Added |
| 4 | GLAZER CAPITAL, LLC | $68,000 | 420,536 | Hold |
| 5 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $65,842 | 424,512 | Hold |
| 6 | AQR Arbitrage LLC | $64,525 | 324,248 | Added |
| 7 | Polar Asset Management Partners Inc. | $64,280 | 400,000 | Hold |
| 8 | Linden Advisors LP | $64,280 | 400,000 | Hold |
| 9 | HGC Investment Management Inc. | $59,700 | 300,000 | Hold |
| 10 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $52,244 | 307,316 | Trimmed |
| 11 | Clear Street Group Inc. | $44,254 | 222,380 | Trimmed |
| 12 | Cable Car Capital, LP | $34,785 | 174,801 | Hold |
| 13 | RLH Capital LLC | $29,713 | 184,900 | Hold |
| 14 | WOLVERINE ASSET MANAGEMENT LLC | $26,378 | 132,552 | Trimmed |
| 15 | Hudson Bay Capital Management LP | $25,500 | 150,000 | Hold |
| 16 | Radcliffe Capital Management, L.P. | $24,105 | 150,000 | Hold |
| 17 | HEIGHTS CAPITAL MANAGEMENT, INC | $21,287 | 106,968 | Trimmed |
| 18 | D. E. Shaw & Co., Inc. | $21,250 | 125,000 | Hold |
| 19 | Periscope Capital Inc. | $20,088 | 125,000 | Hold |
| 20 | BNP PARIBAS FINANCIAL MARKETS | $16,374 | 102,340 | Hold |
| 21 | BOOTHBAY FUND MANAGEMENT, LLC | $16,070 | 100,000 | Hold |
| 22 | Westchester Capital Management, LLC | $12,250 | 100,000 | New |
| 23 | Schonfeld Strategic Advisors LLC | $8,709 | 54,200 | Trimmed |
| 24 | BERKLEY W R CORP | $3,874 | 24,108 | Trimmed |
| 25 | UBS Group AG | $1,955 | 16,027 | Hold |
Source: SEC Form 13F filings · as of 2026-06-30