QMCO Quantum Corp.
Quantum Corp. (QMCO) Institutional Ownership
What the institutions did with QMCO last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| Alyeska Investment Group, L.P. | 2.7M | 18.5% |
| Two Seas Capital LP | 2.5M | 17.3% |
| OAKTREE CAPITAL MANAGEMENT LP | 2.0M | 14.0% |
| NEUBERGER BERMAN GROUP LLC | 1.2M | 8.1% |
| ASHFORD CAPITAL MANAGEMENT INC | 1.0M | 7.2% |
| Portolan Capital Management, LLC | 1.0M | 7.1% |
| MARSHALL WACE, LLP | 713.1K | 5.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 605.5K | 4.2% |
| Manatuck Hill Partners, LLC | 350.0K | 2.4% |
| BlackRock, Inc. | 273.0K | 1.9% |
| Cinctive Capital Management LP | 182.8K | 1.3% |
| BANK OF AMERICA CORP /DE/ | 170.1K | 1.2% |
| GEODE CAPITAL MANAGEMENT, LLC | 164.6K | 1.1% |
| RENAISSANCE TECHNOLOGIES LLC | 154.5K | 1.1% |
| SONA ASSET MANAGEMENT (US) LLC | 150.0K | 1.0% |
| Walleye Capital LLC | 120.0K | 0.8% |
| RAYMOND JAMES FINANCIAL INC | 103.8K | 0.7% |
| Centiva Capital, LP | 100.0K | 0.7% |
| KKM Financial LLC | 90.3K | 0.6% |
| VANGUARD FIDUCIARY TRUST CO | 89.1K | 0.6% |
| Qube Research & Technologies Ltd | 81.0K | 0.6% |
| STATE STREET CORP | 75.9K | 0.5% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 69.8K | 0.5% |
| Man Group plc | 68.6K | 0.5% |
| Informed Momentum Co LLC | 64.9K | 0.5% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Alyeska Investment Group, L.P. | New | 0 | 2.7M | +2.7M |
| Two Seas Capital LP | New | 0 | 2.5M | +2.5M |
| OAKTREE CAPITAL MANAGEMENT LP | New | 0 | 2.0M | +2.0M |
| NEUBERGER BERMAN GROUP LLC | New | 0 | 1.2M | +1.2M |
| ASHFORD CAPITAL MANAGEMENT INC | New | 0 | 1.0M | +1.0M |
| Portolan Capital Management, LLC | New | 0 | 1.0M | +1.0M |
| MARSHALL WACE, LLP | Increased | 37.5K | 713.1K | +675.5K |
| Manatuck Hill Partners, LLC | New | 0 | 350.0K | +350.0K |
| Cinctive Capital Management LP | New | 0 | 182.8K | +182.8K |
| RENAISSANCE TECHNOLOGIES LLC | New | 0 | 154.5K | +154.5K |
| BANK OF AMERICA CORP /DE/ | Increased | 20.5K | 170.1K | +149.6K |
| Walleye Capital LLC | New | 0 | 120.0K | +120.0K |
| RAYMOND JAMES FINANCIAL INC | New | 0 | 103.8K | +103.8K |
| Centiva Capital, LP | New | 0 | 100.0K | +100.0K |
| KKM Financial LLC | New | 0 | 90.3K | +90.3K |
| Qube Research & Technologies Ltd | New | 0 | 81.0K | +81.0K |
| SONA ASSET MANAGEMENT (US) LLC | Increased | 70.1K | 150.0K | +79.9K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | 0 | 69.8K | +69.8K |
| Man Group plc | New | 0 | 68.6K | +68.6K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 539.3K | 605.5K | +66.3K |
| Informed Momentum Co LLC | New | 0 | 64.9K | +64.9K |
| BlackRock, Inc. | Increased | 217.5K | 273.0K | +55.5K |
| UBS Group AG | Reduced | 99.1K | 46.1K | -53.0K |
| SEI INVESTMENTS CO | New | 0 | 38.7K | +38.7K |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | New | 0 | 34.6K | +34.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.