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.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| Alyeska Investment Group, L.P. | 2.7M | 18.4% |
| Two Seas Capital LP | 2.5M | 17.2% |
| OAKTREE CAPITAL MANAGEMENT LP | 2.0M | 13.9% |
| NEUBERGER BERMAN GROUP LLC | 1.2M | 8.0% |
| ASHFORD CAPITAL MANAGEMENT INC | 1.0M | 7.2% |
| Portolan Capital Management, LLC | 1.0M | 7.1% |
| MARSHALL WACE, LLP | 713.1K | 4.9% |
| 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% |
| Cygnus Capital Advisors, LLC | 74.3K | 0.5% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 69.8K | 0.5% |
| Man Group plc | 68.6K | 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 |
| Cygnus Capital Advisors, LLC | Reduced | 124.1K | 74.3K | -49.8K |
| SEI INVESTMENTS CO | New | 0 | 38.7K | +38.7K |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | New | 0 | 34.6K | +34.6K |
| Squarepoint Ops LLC | New | 0 | 33.8K | +33.8K |
| LPL Financial LLC | Sold Out | 24.6K | 0 | -24.6K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 21.8K | +21.8K |
| GOLDMAN SACHS GROUP INC | New | 0 | 19.2K | +19.2K |
| CITIGROUP INC | New | 0 | 14.4K | +14.4K |
| R Squared Ltd | Sold Out | 12.2K | 0 | -12.2K |
| Schonfeld Strategic Advisors LLC | New | 0 | 12.1K | +12.1K |
| BARCLAYS PLC | Reduced | 12.4K | 455 | -12.0K |
| XTX Topco Ltd | Sold Out | 11.3K | 0 | -11.3K |
| Invesco Ltd. | New | 0 | 10.8K | +10.8K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 80.3K | 89.1K | +8.9K |
| WELLS FARGO & COMPANY/MN | Increased | 4.1K | 11.3K | +7.2K |
| FLAGSHIP HARBOR ADVISORS, LLC | Reduced | 17.2K | 11.0K | -6.2K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 159.2K | 164.6K | +5.4K |
| NORTHERN TRUST CORP | Increased | 28.8K | 33.2K | +4.5K |
| JPMORGAN CHASE & CO | Increased | 8 | 3.7K | +3.7K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 21.8K | 25.1K | +3.3K |
| STATE STREET CORP | Increased | 72.8K | 75.9K | +3.1K |
| HOLLENCREST CAPITAL MANAGEMENT | Reduced | 2.0K | 10 | -2.0K |
| Kovack Advisors, Inc. | Increased | 12.5K | 13.4K | +950 |
| SBI Securities Co., Ltd. | Reduced | 2.0K | 1.1K | -934 |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 261 | 1.2K | +926 |
| Tower Research Capital LLC (TRC) | New | 0 | 655 | +655 |
| ROYAL BANK OF CANADA | Increased | 128 | 765 | +637 |
| OSAIC HOLDINGS, INC. | Reduced | 965 | 485 | -480 |
| FEDERATED HERMES, INC. | Increased | 835 | 1.2K | +323 |
| MORGAN STANLEY | Increased | 15.2K | 15.5K | +313 |
| HARBOUR INVESTMENTS, INC. | New | 0 | 183 | +183 |
| JONES FINANCIAL COMPANIES LLLP | Increased | 1.5K | 1.6K | +113 |
| FMR LLC | New | 0 | 106 | +106 |
| NATIONAL BANK OF CANADA /FI/ | Sold Out | 100 | 0 | -100 |
| Rialto Wealth Management, LLC | Sold Out | 87 | 0 | -87 |
| Lavaca Capital LLC | Sold Out | 39 | 0 | -39 |
| Continuum Advisory, LLC | New | 0 | 34 | +34 |
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.