Who Owns QUANTUM CORP (QMCO)? -- Institutional Holders (2026-06-30)
70 institutions reported holding $154.2M of QUANTUM CORP (QMCO) in SEC 13F filings for 2026-06-30. Largest institutional holders: Alyeska Investment Group, L.P. ($29.2M), Two Seas Capital LP ($27.4M), OAKTREE CAPITAL MANAGEMENT LP ($22.1M), NEUBERGER BERMAN GROUP LLC ($12.8M), Portolan Capital Management, LLC ($11.2M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | Alyeska Investment Group, L.P. | $29.2M | 2.7M | New |
| 2 | Two Seas Capital LP | $27.4M | 2.5M | New |
| 3 | OAKTREE CAPITAL MANAGEMENT LP | $22.1M | 2.0M | New |
| 4 | NEUBERGER BERMAN GROUP LLC | $12.8M | 1.2M | New |
| 5 | Portolan Capital Management, LLC | $11.2M | 1.0M | New |
| 6 | MARSHALL WACE, LLP | $7.8M | 713,075 | Added |
| 7 | VANGUARD GROUP INC | $7.7M | 700,666 | Added |
| 8 | Manatuck Hill Partners, LLC | $3.9M | 350,000 | New |
| 9 | BlackRock, Inc. | $3.0M | 273,030 | Added |
| 10 | SONA ASSET MANAGEMENT (US) LLC | $2.8M | 250,100 | Added |
| 11 | JANE STREET GROUP, LLC | $2.3M | 208,500 | New |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $2.2M | 200,075 | New |
| 13 | Cinctive Capital Management LP | $2.0M | 182,769 | New |
| 14 | BANK OF AMERICA CORP /DE/ | $1.9M | 170,130 | Added |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | $1.8M | 164,600 | Added |
| 16 | RENAISSANCE TECHNOLOGIES LLC | $1.7M | 154,516 | New |
| 17 | CITADEL ADVISORS LLC | $1.5M | 136,800 | New |
| 18 | Walleye Capital LLC | $1.3M | 120,044 | New |
| 19 | RAYMOND JAMES FINANCIAL INC | $1.1M | 103,836 | New |
| 20 | Centiva Capital, LP | $1.1M | 100,000 | New |
| 21 | KKM Financial LLC | $960,515 | 90,274 | New |
| 22 | Qube Research & Technologies Ltd | $890,747 | 80,977 | New |
| 23 | STATE STREET CORP | $835,054 | 75,914 | Added |
| 24 | SIMPLEX TRADING, LLC | $823,900 | 74,900 | New |
| 25 | Man Group plc | $754,523 | 68,593 | New |
Source: SEC Form 13F filings · as of 2026-06-30