Quantum Corporation · NASDAQ:QMCO
Quantum Corporation shareholders
As of Jun 30, 2026, 57 institutions reported holding Quantum Corporation, 36.5% of its shares. Largest: Alyeska Investment Group, L.P., Two Seas Capital LP and Oaktree Capital Management LP. New holders, exits, insiders and big stakes, each with its filing.
| Holder | Shares | % of Quantum Corporation | Change | Filed |
|---|---|---|---|---|
| Alyeska Investment Group, L.P. | 2.65M | 6.7% | new | Aug 14, 2026 |
| Two Seas Capital LP | 2.49M | 6.3% | new | Aug 12, 2026 |
| Oaktree Capital Management LP | 2.01M | 5.1% | new | Aug 14, 2026 |
| Neuberger Berman Group LLC | 1.16M | 3.0% | new | Aug 13, 2026 |
| Ashford Capital Management Inc | 1.04M | 2.6% | new | Aug 21, 2026 |
| Portolan Capital Management, LLC | 1.02M | 2.6% | new | Aug 14, 2026 |
| Marshall Wace, LLP | 713K | 1.8% | +676K | Aug 13, 2026 |
| Vanguard | 701K | 1.8% | +75,128 | Aug 13, 2026 |
| Manatuck Hill Partners, LLC | 350K | 0.89% | new | Aug 14, 2026 |
| BlackRock | 273K | 0.69% | +55,498 | Aug 7, 2026 |