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Quantum
QMCO
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Overview
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Options
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News
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Financials
Financials
Forecast
Forecast
Valuation
Valuation
Shareholders
Shareholders
Profile
Profile
All Shareholders
Institutional Holders
Insiders
All Shareholders
Shareholder Type
Public and others
94.61%
Institutions
4.64%
Individuals & Insiders
0.75%
Major Shareholders
Latest
Major Shareholders Latest
Shareholder
% Held
Shares Held
Change %
Shares Changed
Report Date
Vanguard Capital Management, LLC
1.37%
539.28K
--
+539.28K
03/31/2026
BlackRock, Inc.
0.55%
217.53K
1.01%
-3.21K
03/31/2026
Geode Capital Management, LLC
0.40%
159.18K
0.71%
+2.31K
03/31/2026
Blue Torch Capital LP
0.34%
135.76K
0.62%
+0
02/14/2025
Cygnus Capital Advisors, LLC
0.32%
124.09K
0.18%
+54.66K
03/31/2026
James Lerner
Former Chairman, President & CEO
0.28%
110.85K
0.50%
+0
10/20/2025
UBS Asset Management AG
0.25%
99.07K
0.92%
-66.77K
03/31/2026
KKM Financial LLC
0.22%
88.49K
--
+88.49K
04/30/2026
Vanguard Fiduciary Trust Company
0.20%
80.26K
--
+0
03/31/2026
State Street Global Advisors, Inc.
0.18%
72.81K
0.46%
-17.90K
03/31/2026
Sona Asset Management Limited
0.18%
70.09K
--
+70.09K
03/31/2026
Hugues Meyrath
President, CEO & Director
0.11%
43.47K
0.06%
+18.77K
07/02/2026
Marshall Wace LLP
0.10%
37.53K
0.06%
+15.79K
03/31/2026
Yue Zhou White
Independent Director
0.07%
29.14K
0.05%
+12.00K
01/01/2026
Northern Trust Global Investments
0.07%
28.76K
0.13%
+0
03/31/2026
Brian Cabrera
Former SVP, Chief Administrative Officer, Chief Legal and Compliance Officer, and CS
0.07%
28.74K
0.13%
+0
10/20/2025
Donald Jaworski
Independent Chairman of the Board
0.07%
27.68K
0.04%
+24.00K
01/01/2026
LPL Financial LLC
0.06%
24.60K
0.07%
+6.23K
03/31/2026
T. Rowe Price Group, Inc.
0.06%
21.80K
0.06%
+5.90K
03/31/2026
Merrill Lynch, Pierce, Fenner & Smith Incorporated
0.05%
20.49K
0.09%
+4.00
03/31/2026
