QUANTUM CORP /DE/ - QMCO
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | History | Added to | 625,538 | 4,034 | 0.0% | 0.0% | 1 | +321,941 | 106.04% | Q4 2025 | Jan 29, 2026 |
| Portolan Capital Management, LLC | History | New | 477,214 | 3,078 | 0.16% | — | 2 | +477,214 | New | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Added to | 220,746 | 1,423 | 0.0% | 0.0% | 3 | +58,408 | 35.98% | Q4 2025 | Feb 12, 2026 |
| UBS Group AG | History | Added to | 165,838 | 1,069 | 0.0% | 0.0% | 4 | +3,233 | 1.99% | Q4 2025 | Jan 29, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 156,871 | 1,011 | 0.0% | 0.0% | 5 | +77,444 | 97.5% | Q4 2025 | Feb 09, 2026 |
| STATE STREET CORP | History | Added to | 90,714 | 585 | 0.0% | 0.0% | 6 | +63,367 | 231.71% | Q4 2025 | Feb 13, 2026 |
| Cygnus Capital Advisors, LLC | History | New | 69,423 | 448 | 0.33% | — | 7 | +69,423 | New | Q4 2025 | May 11, 2026 |
| AlphaQuest LLC | History | Reduced | 29,386 | 189 | 0.01% | 0.02% | 8 | -6,150 | -17.31% | Q4 2025 | Feb 09, 2026 |
| NORTHERN TRUST CORP | History | Added to | 28,762 | 185 | 0.0% | 0.0% | 9 | +17,075 | 146.1% | Q4 2025 | Feb 17, 2026 |
| FLAGSHIP HARBOR ADVISORS, LLC | History | Added to | 26,585 | 171 | 0.01% | 0.01% | 10 | +3,875 | 17.06% | Q4 2025 | Jan 21, 2026 |
| MARSHALL WACE, LLP | History | New | 21,740 | 140 | 0.0% | — | 11 | +21,740 | New | Q4 2025 | Feb 13, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 20,535 | 132 | 0.0% | 0.0% | 12 | +17,639 | 609.08% | Q4 2025 | Feb 17, 2026 |
| LPL Financial LLC | History | New | 18,364 | 118 | 0.0% | — | 13 | +18,364 | New | Q4 2025 | Feb 11, 2026 |
| Engineers Gate Manager LP | History | New | 16,407 | 105 | 0.0% | — | 14 | +16,407 | New | Q4 2025 | Feb 17, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | History | New | 15,901 | 103 | 0.0% | — | 15 | +15,901 | New | Q4 2025 | Feb 17, 2026 |
| BARCLAYS PLC | History | Added to | 14,197 | 91 | 0.0% | 0.0% | 16 | +13,742 | 3020.22% | Q4 2025 | Feb 13, 2026 |
| CITIGROUP INC | History | New | 12,828 | 82 | 0.0% | — | 17 | +12,828 | New | Q4 2025 | Feb 13, 2026 |
| XTX Topco Ltd | History | New | 11,948 | 77 | 0.0% | — | 18 | +11,948 | New | Q4 2025 | Feb 17, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | New | 11,244 | 72 | 0.0% | — | 19 | +11,244 | New | Q4 2025 | Feb 17, 2026 |
| MORGAN STANLEY | History | Added to | 4,313 | 27 | 0.0% | 0.0% | 20 | +957 | 28.52% | Q4 2025 | May 27, 2026 |
| NBC SECURITIES, INC. | History | New | 4,000 | 25 | 0.0% | — | 21 | +4,000 | New | Q4 2025 | Jan 29, 2026 |
| WELLS FARGO & COMPANY/MN | History | Added to | 3,525 | 22 | 0.0% | 0.0% | 22 | +3,285 | 1368.75% | Q4 2025 | Feb 13, 2026 |
| SBI Securities Co., Ltd. | History | Reduced | 2,425 | 15 | 0.0% | 0.0% | 23 | -3,545 | -59.38% | Q4 2025 | Feb 03, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | Added to | 1,841 | 11 | 0.0% | 0.0% | 24 | +946 | 105.7% | Q4 2025 | Feb 17, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 1,019 | 6 | 0.0% | 0.0% | 25 | -2,442 | -70.56% | Q4 2025 | Feb 10, 2026 |
| ROYAL BANK OF CANADA | History | New | 833 | 5 | 0.0% | — | 26 | +833 | New | Q4 2025 | Feb 17, 2026 |
| OSAIC HOLDINGS, INC. | History | Reduced | 748 | 4 | 0.0% | 0.0% | 27 | -242 | -24.44% | Q4 2025 | Feb 17, 2026 |
| FEDERATED HERMES, INC. | History | New | 501 | 3 | 0.0% | — | 28 | +501 | New | Q4 2025 | Feb 12, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 582 | 3 | 0.0% | 0.0% | 29 | +155 | 36.3% | Q4 2025 | Feb 17, 2026 |
| Quattro Advisors LLC | History | New | 400 | 2 | 0.0% | — | 30 | +400 | New | Q4 2025 | Feb 13, 2026 |
| FIFTH THIRD BANCORP | History | No change | 295 | 1 | 0.0% | 0.0% | 31 | 0 | 0.0% | Q4 2025 | Feb 02, 2026 |
| Riverview Capital Advisers, LLC | History | Closed out | 0 | 0 | — | 0.03% | — | -10,000 | -100.0% | Q4 2025 | Feb 17, 2026 |
| HOLLENCREST CAPITAL MANAGEMENT | History | Closed out | 0 | 0 | — | 0.0% | — | -6,560 | -100.0% | Q4 2025 | Feb 12, 2026 |
| NewEdge Advisors, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -700 | -100.0% | Q4 2025 | Feb 18, 2026 |
| Farther Finance Advisors, LLC | History | Reduced | 4 | 0 | — | 0.0% | — | -300 | -98.68% | Q4 2025 | Jan 23, 2026 |
| FNY Investment Advisers, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -273 | -100.0% | Q4 2025 | Jan 16, 2026 |
| WHITTIER TRUST CO | History | Closed out | 0 | 0 | — | 0.0% | — | -187 | -100.0% | Q4 2025 | Jan 26, 2026 |
| Physician Wealth Advisors, Inc. | History | Closed out | 0 | 0 | — | 0.0% | — | -102 | -100.0% | Q4 2025 | Jan 29, 2026 |
| NATIONAL BANK OF CANADA /FI/ | History | New | 100 | 0 | — | — | — | +100 | New | Q4 2025 | Feb 17, 2026 |
| EFG International AG | History | New | 100 | 0 | — | — | — | +100 | New | Q4 2025 | Feb 17, 2026 |
| Avion Wealth | History | New | 68 | 0 | — | — | — | +68 | New | Q4 2025 | Jan 23, 2026 |
| Global Retirement Partners, LLC | History | New | 65 | 0 | — | — | — | +65 | New | Q4 2025 | Feb 06, 2026 |
| Rialto Wealth Management, LLC | History | Closed out | 0 | 0 | — | — | — | -42 | -100.0% | Q4 2025 | Jan 12, 2026 |
| Federation des caisses Desjardins du Quebec | History | New | 25 | 0 | — | — | — | +25 | New | Q4 2025 | Feb 12, 2026 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | History | New | 15 | 0 | — | — | — | +15 | New | Q4 2025 | Feb 10, 2026 |
| Activest Wealth Management | History | New | 1 | 0 | — | — | — | +1 | New | Q4 2025 | Jan 30, 2026 |
| JPMORGAN CHASE & CO | History | No change | 8 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 11, 2026 |