QUANTUM CORP /DE/ - QMCO

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
13D/13G major owners: Ownership tab.
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
AlphaQuest LLC History Reduced 29,386 189 0.01% 0.02% 7 -6,150 -17.31% Q4 2025 Feb 09, 2026
NORTHERN TRUST CORP History Added to 28,762 185 0.0% 0.0% 8 +17,075 146.1% Q4 2025 Feb 17, 2026
FLAGSHIP HARBOR ADVISORS, LLC History Added to 26,585 171 0.01% 0.01% 9 +3,875 17.06% Q4 2025 Jan 21, 2026
MARSHALL WACE, LLP History New 21,740 140 0.0% 10 +21,740 New Q4 2025 Feb 13, 2026
BANK OF AMERICA CORP /DE/ History Added to 20,535 132 0.0% 0.0% 11 +17,639 609.08% Q4 2025 Feb 17, 2026
LPL Financial LLC History New 18,364 118 0.0% 12 +18,364 New Q4 2025 Feb 11, 2026
Engineers Gate Manager LP History New 16,407 105 0.0% 13 +16,407 New Q4 2025 Feb 17, 2026
PRICE T ROWE ASSOCIATES INC /MD/ History New 15,901 103 0.0% 14 +15,901 New Q4 2025 Feb 17, 2026
BARCLAYS PLC History Added to 14,197 91 0.0% 0.0% 15 +13,742 3020.22% Q4 2025 Feb 13, 2026
CITIGROUP INC History New 12,828 82 0.0% 16 +12,828 New Q4 2025 Feb 13, 2026
XTX Topco Ltd History New 11,948 77 0.0% 17 +11,948 New Q4 2025 Feb 17, 2026
MILLENNIUM MANAGEMENT LLC History New 11,244 72 0.0% 18 +11,244 New Q4 2025 Feb 17, 2026
MORGAN STANLEY History Added to 4,313 27 0.0% 0.0% 19 +957 28.52% Q4 2025 Feb 13, 2026
NBC SECURITIES, INC. History New 4,000 25 0.0% 20 +4,000 New Q4 2025 Jan 29, 2026
WELLS FARGO & COMPANY/MN History Added to 3,525 22 0.0% 0.0% 21 +3,285 1368.75% Q4 2025 Feb 13, 2026
SBI Securities Co., Ltd. History Reduced 2,425 15 0.0% 0.0% 22 -3,545 -59.38% Q4 2025 Feb 03, 2026
JONES FINANCIAL COMPANIES LLLP History Added to 1,841 11 0.0% 0.0% 23 +946 105.7% Q4 2025 Feb 17, 2026
BNP PARIBAS FINANCIAL MARKETS History Reduced 1,019 6 0.0% 0.0% 24 -2,442 -70.56% Q4 2025 Feb 10, 2026
ROYAL BANK OF CANADA History New 833 5 0.0% 25 +833 New Q4 2025 Feb 17, 2026
OSAIC HOLDINGS, INC. History Reduced 748 4 0.0% 0.0% 26 -242 -24.44% Q4 2025 Feb 17, 2026
FEDERATED HERMES, INC. History New 501 3 0.0% 27 +501 New Q4 2025 Feb 12, 2026
Tower Research Capital LLC (TRC) History Added to 582 3 0.0% 0.0% 28 +155 36.3% Q4 2025 Feb 17, 2026
Quattro Advisors LLC History New 400 2 0.0% 29 +400 New Q4 2025 Feb 13, 2026
FIFTH THIRD BANCORP History No change 295 1 0.0% 0.0% 30 0 0.0% Q4 2025 Feb 02, 2026
Riverview Capital Advisers, LLC History Closed out 0 0 0.03% -10,000 -100.0% Q3 2025 Nov 12, 2025
HOLLENCREST CAPITAL MANAGEMENT History Closed out 0 0 0.0% -6,560 -100.0% Q3 2025 Nov 03, 2025
NewEdge Advisors, LLC History Closed out 0 0 0.0% -700 -100.0% Q3 2025 Nov 17, 2025
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% Q3 2025 Dec 15, 2025
WHITTIER TRUST CO History Closed out 0 0 0.0% -187 -100.0% Q3 2025 Oct 31, 2025
Physician Wealth Advisors, Inc. History Closed out 0 0 0.0% -102 -100.0% Q3 2025 Nov 04, 2025
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% Q3 2025 Nov 07, 2025
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