Who Owns Quantumsphere Acquisition Corp (QUMS)? -- Institutional Holders (2026-06-30)
30 institutions reported holding $87.7M of Quantumsphere Acquisition Corp (QUMS) in SEC 13F filings for 2026-06-30. Largest institutional holders: MIZUHO SECURITIES USA LLC ($15.0M), BERKLEY W R CORP ($9.0M), WOLVERINE ASSET MANAGEMENT LLC ($6.2M), Karpus Management, Inc. ($4.8M), RIVERNORTH CAPITAL MANAGEMENT, LLC ($4.4M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | MIZUHO SECURITIES USA LLC | $15.0M | 1.5M | Added |
| 2 | BERKLEY W R CORP | $9.0M | 881,402 | Added |
| 3 | WOLVERINE ASSET MANAGEMENT LLC | $6.2M | 602,984 | Trimmed |
| 4 | Karpus Management, Inc. | $4.8M | 469,875 | Trimmed |
| 5 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $4.4M | 424,124 | Trimmed |
| 6 | D. E. Shaw & Co., Inc. | $4.2M | 409,860 | Hold |
| 7 | Shaolin Capital Management LLC | $4.1M | 405,761 | Trimmed |
| 8 | GLAZER CAPITAL, LLC | $4.1M | 400,089 | Trimmed |
| 9 | Linden Advisors LP | $4.1M | 400,000 | Hold |
| 10 | Polar Asset Management Partners Inc. | $4.1M | 400,000 | Hold |
| 11 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $3.9M | 377,607 | Added |
| 12 | Westchester Capital Management, LLC | $3.6M | 350,000 | Added |
| 13 | AQR Arbitrage LLC | $3.2M | 312,523 | Added |
| 14 | RLH Capital LLC | $2.6M | 250,000 | Added |
| 15 | Hudson Bay Capital Management LP | $2.4M | 235,000 | Hold |
| 16 | Cable Car Capital, LP | $1.8M | 174,801 | Hold |
| 17 | Clear Street Group Inc. | $1.7M | 164,793 | Trimmed |
| 18 | HEIGHTS CAPITAL MANAGEMENT, INC | $1.5M | 150,000 | Hold |
| 19 | Radcliffe Capital Management, L.P. | $1.5M | 150,000 | Hold |
| 20 | BNP PARIBAS FINANCIAL MARKETS | $1.2M | 115,048 | Hold |
| 21 | Crossingbridge Advisors, LLC | $1.1M | 107,825 | Hold |
| 22 | TORONTO DOMINION BANK | $1.0M | 100,000 | Trimmed |
| 23 | Periscope Capital Inc. | $766,500 | 75,000 | Trimmed |
| 24 | Quarry LP | $766,500 | 75,000 | New |
| 25 | Schonfeld Strategic Advisors LLC | $562,100 | 55,000 | Hold |
Source: SEC Form 13F filings · as of 2026-06-30