QUMS Quantumsphere Acquisition Corp. - Ordinary Shares
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Institutional owners (13F) 26 filers · $73.3M total · As of June 30, 2026
Institutions that report holding this stock in their quarterly SEC Form 13F. Long positions only; a single filer may appear twice for separate option legs. Large offsetting put/call legs typically reflect market-making or hedged inventory, not directional conviction.
| New positions | Exited positions | Increased | Decreased | Net shares change |
|---|---|---|---|---|
| 1 (-3 vs prior Q) | 3 (+2 vs prior Q) | 5 (-1 vs prior Q) | 10 (+3 vs prior Q) | +143K |
Compared to Q1 2026. SEC Form 13F filings are due within 45 days of quarter-end plus a short buffer for late filers — quarters still inside that window are skipped in favor of the most recent fully-reported pair.
| Institution | Value | Shares | % of tracked 13F | Type |
|---|---|---|---|---|
| BERKLEY W R CORP | $9,007,928 | 881,402 | 12.28% | Shares |
| MIZUHO SECURITIES USA LLC | $7,683,783 | 757,023 | 10.48% | Shares |
| WOLVERINE ASSET MANAGEMENT LLC | $6,162,496 | 602,984 | 8.40% | Shares |
| Karpus Management, Inc. | $4,802,123 | 469,875 | 6.55% | Shares |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | $4,368,477 | 424,124 | 5.96% | Shares |
| D. E. Shaw & Co., Inc. | $4,188,769 | 409,860 | 5.71% | Shares |
| Shaolin Capital Management LLC | $4,146,877 | 405,761 | 5.65% | Shares |
| Linden Advisors LP | $4,088,000 | 400,000 | 5.57% | Shares |
| Polar Asset Management Partners Inc. | $4,088,000 | 400,000 | 5.57% | Shares |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | $3,870,472 | 377,607 | 5.28% | Shares |
| Westchester Capital Management, LLC | $3,249,643 | 317,969 | 4.43% | Shares |
| AQR Arbitrage LLC | $3,193,985 | 312,523 | 4.36% | Shares |
| Hudson Bay Capital Management LP | $2,401,700 | 235,000 | 3.27% | Shares |
| Cable Car Capital, LP | $1,786,466 | 174,801 | 2.44% | Shares |
| Clear Street Group Inc. | $1,684,184 | 164,793 | 2.30% | Shares |
| HEIGHTS CAPITAL MANAGEMENT, INC | $1,533,000 | 150,000 | 2.09% | Shares |
| Radcliffe Capital Management, L.P. | $1,533,000 | 150,000 | 2.09% | Shares |
| BNP PARIBAS FINANCIAL MARKETS | $1,175,791 | 115,048 | 1.60% | Shares |
| Crossingbridge Advisors, LLC | $1,101,972 | 107,825 | 1.50% | Shares |
| TORONTO DOMINION BANK | $1,022,000 | 100,000 | 1.39% | Shares |
| Quarry LP | $766,500 | 75,000 | 1.05% | Shares |
| Periscope Capital Inc. | $766,500 | 75,000 | 1.05% | Shares |
| Schonfeld Strategic Advisors LLC | $562,100 | 55,000 | 0.77% | Shares |
| Logan Stone Capital, LLC | $148,139 | 14,495 | 0.20% | Shares |
| GLAZER CAPITAL, LLC | $4,089 | 400,089 | 0.01% | Shares |
| MORGAN STANLEY | $542 | 53 | 0.00% | Shares |
Activists & 5%+ owners 1 position
Investors who filed SEC Schedule 13D — beneficial ownership above 5% with an intent to influence the issuer (activist stakes, board campaigns, M&A). Each row shows the most recent known state of that filer's position.
| Filer | Filed | Stake | Status | Purpose | Filing |
|---|---|---|---|---|---|
| Whiteowl Holdings LLC | Sept. 15, 2025 | 27.41% | Initial filing | Passive investment | SEC |
Purpose is an automated classification of the filer's own stated purpose (SEC Item 4) — not investment advice. "—" means no clear purpose was stated or the text could not be classified.