QuantumQMCO
13F holders, Q4 2025 (December 31)40holders +12
15new positions
7sold out
1famous investor
$6.45avg. 13F price*
At the end of Q4 2025, 40 institutions reported holding Quantum Corp. (QMCO) in their 13F filings, up 12 from Q3 2025. 15 opened new positions and 7 sold out. The largest holders were Vanguard Group Inc. ($4.0M), Portolan Capital Management, LLC ($3.1M) and BlackRock, Inc. ($1.4M). One famous investor held it Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Quantum Corp.
- CUSIP
- 747906600
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 15 | $3.8M |
| Exits | 7 | $177K |
All 13F filers, Q3 2025 → Q4 2025: 1,172,488 shares bought and 52,425 shares sold, net +1,120,063 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 40 holders
| Vanguard Group Inc. | 0.00% | Add +106.0% | 625,538 | $4.0M |
| Portolan Capital Management, LLC | 0.16% | New | 477,214 | $3.1M |
| BlackRock, Inc. | 0.00% | Add +36.0% | 220,746 | $1.4M |
| UBS Group AG | 0.00% | Add +2.0% | 165,838 | $1.1M |
| Geode Capital Management, LLC | 0.00% | Add +97.5% | 156,871 | $1.0M |
| State Street Corp. | 0.00% | Add +231.7% | 90,714 | $585K |
| Cygnus Capital Advisors, LLC | 0.34% | — | 69,423 | $448K |
| AlphaQuest LLC | 0.01% | Reduce -17.3% | 29,386 | $190K |
| Northern Trust Corp. | 0.00% | Add +146.1% | 28,762 | $186K |
| Flagship Harbor Advisors, LLC | 0.01% | Add +17.1% | 26,585 | $171K |
| Marshall Wace, LLP | 0.00% | New | 21,740 | $140K |
| Bank of America Corp. | 0.00% | Add +609.1% | 20,535 | $132K |
| LPL Financial LLC | 0.00% | New | 18,364 | $118K |
| Engineers Gate Manager LP | 0.00% | New | 16,407 | $106K |
| T. Rowe Price Associates Inc. | 0.00% | New | 15,901 | $103K |
| Barclays PLC | 0.00% | Add +3020.2% | 14,197 | $92K |
| Citigroup Inc. | 0.00% | New | 12,828 | $83K |
| XTX Topco Ltd | 0.00% | New | 11,948 | $77K |
| Millennium Management | 0.00% | New | 11,244 | $73K |
| Morgan Stanley | 0.00% | Add +28.5% | 4,313 | $28K |
| Lanark Financial, Inc. | 0.00% | New | 4,000 | $26K |
| Wells Fargo & Company | 0.00% | Add +1368.8% | 3,525 | $23K |
| SBI Securities Co., Ltd. | 0.00% | Reduce -59.4% | 2,425 | $16K |
| Jones Financial Companies LLLP | 0.00% | Add +105.7% | 1,841 | $12K |
| BNP Paribas Financial Markets | 0.00% | Reduce -70.6% | 1,019 | $7K |
| Royal Bank of Canada | 0.00% | Reduce -96.3% | 833 | $5K |
| Osaic Holdings, Inc. | 0.00% | Reduce -24.4% | 748 | $5K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +36.3% | 582 | $4K |
| Federated Hermes, Inc. | 0.00% | New | 501 | $3K |
| Quattro Advisors LLC | 0.00% | — | 400 | $3K |
| Fifth Third Bancorp | 0.00% | No change | 295 | $2K |
| EFG International AG | 0.00% | — | 100 | $645 |
| National Bank of Canada | 0.00% | New | 100 | $644 |
| Global Retirement Partners, LLC | 0.00% | New | 65 | $419 |
| Federation des caisses Desjardins du Quebec | 0.00% | New | 25 | $161 |
| Northwestern Mutual Wealth Management Co. | 0.00% | New | 15 | $97 |
| JPMorgan Chase & Co. | 0.00% | No change | 8 | $52 |
| Farther Finance Advisors, LLC | 0.00% | Reduce -98.7% | 4 | $26 |
| Activest Wealth Management | 0.00% | Add +0.0% | 1 | $5 |
| Avion Wealth | 0.00% | New | 68 | $0 |
"% of holder's portfolio" is QMCO's weight in each manager's 13F, not the share of Quantum Corp. the manager owns.