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Quantum Corp
QMCO

28 hedge funds and large institutions have $8.58M invested in Quantum Corp in 2025 Q3 according to their latest regulatory filings, with 3 funds opening new positions, 13 increasing their positions, 4 reducing their positions, and 9 closing their positions.

New
Increased
Maintained
Reduced
Closed

225% more repeat investments, than reductions

Existing positions increased: 13 | Existing positions reduced: 4

3% less capital invested

Capital invested by funds: $8.82M → $8.58M (-$235K)

6.23% less ownership

Funds ownership: 12.72% → 6.5% (-6.2%)

18% less funds holding

Funds holding: 34 → 28 (-6)

67% less first-time investments, than exits

New positions opened: 3 | Existing positions closed: 9

Holders
28
Holders Change
-6
Holders Change %
-17.65%
% of All Funds
0.37%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
3
Increased
13
Reduced
4
Closed
9
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
UBS Group
UBS Group
Switzerland
+$861K
2
Vanguard Group
Vanguard Group
Pennsylvania
+$394K
3
A
AlphaQuest
New York
+$259K
4
FHA
Flagship Harbor Advisors
Massachusetts
+$191K
5
BlackRock
BlackRock
New York
+$177K

Top Sellers

Rank Fund Capital Flow
1
Marshall Wace
Marshall Wace
United Kingdom
-$1.77M
2
Morgan Stanley
Morgan Stanley
New York
-$356K
3
SCA
Sassicaia Capital Advisers
New York
-$232K
4
AWM
Apollon Wealth Management
South Carolina
-$107K
5
CIBC Private Wealth Group
CIBC Private Wealth Group
Georgia
-$104K
Name Holding Trade Value Shares
Change 		Change in
Stake
Vanguard Group
1
Vanguard Group
Pennsylvania
$3.01M +$394K +46,919 +18%
UBS Group
2
UBS Group
Switzerland
$1.61M +$861K +102,384 +170%
BlackRock
3
BlackRock
New York
$1.61M +$177K +21,027 +15%
Geode Capital Management
4
Geode Capital Management
Massachusetts
$788K +$84.4K +10,043 +14%
A
5
AlphaQuest
New York
$353K +$259K +30,829 +655%
State Street
6
State Street
Massachusetts
$271K – – –
FHA
7
Flagship Harbor Advisors
Massachusetts
$225K +$191K +22,710 New
Royal Bank of Canada
8
Royal Bank of Canada
Ontario, Canada
$225K +$28.3K +3,362 +17%
Northern Trust
9
Northern Trust
Illinois
$116K – – –
RCA
10
Riverview Capital Advisers
Massachusetts
$99.2K +$84.1K +10,000 New
HCM
11
Hollencrest Capital Management
California
$65.1K +$38.3K +4,560 +228%
SS
12
SBI Securities
Japan
$59.2K +$2.81K +334 +6%
BNP Paribas Financial Markets
13
BNP Paribas Financial Markets
France
$34.3K +$22.2K +2,641 +322%
Morgan Stanley
14
Morgan Stanley
New York
$33.3K -$356K -42,377 -93%
Bank of America
15
Bank of America
North Carolina
$28.7K +$18.8K +2,234 +337%
Osaic Holdings
16
Osaic Holdings
Arizona
$9.76K +$8.03K +955 +2,729%
Jones Financial Companies
17
Jones Financial Companies
Missouri
$8.48K +$3.37K +401 +81%
NA
18
NewEdge Advisors
Louisiana
$6.94K – – –
Barclays
19
Barclays
United Kingdom
$4.51K – – –
TRCT
20
Tower Research Capital (TRC)
New York
$4.24K -$2.48K -295 -41%
FFA
21
Farther Finance Advisors
California
$3.02K +$2.52K +300 +7,500%
Fifth Third Bancorp
22
Fifth Third Bancorp
Ohio
$2.93K – – –
Wells Fargo
23
Wells Fargo
California
$2.38K -$42.7K -5,075 -95%
WT
24
Whittier Trust
California
$2.2K – – –
FIA
25
FNY Investment Advisers
New York
$2K -$3.31K -394 -59%
1
2

QMCO Hedge Fund Activity: Q3 2025 in Review

28 of the 7,626 institutional investors tracked by Wall St. Rank reported a position in Quantum Corp (QMCO) for Q3 2025, worth a combined $8.58M — down 2.7% from $8.82M a quarter earlier.

Sellers outnumbered buyers: 9 funds closed out of QMCO and 3 opened new positions — a net loss of 6 holders — while 4 trimmed existing stakes and 13 added.

The largest buyer was UBS Group, adding an estimated $861K. The largest seller was Marshall Wace, exiting entirely with an estimated $1.77M sold.

  • 28 institutional investors held Quantum Corp (QMCO) as of Q3 2025, down from 34 in Q2 2025.
  • Funds reported $8.58M of Quantum Corp stock for Q3 2025, down 2.7% quarter-over-quarter.
  • 3 funds opened new Quantum Corp positions in Q3 2025 and 9 closed out, a net change of -6 holders.
  • The largest Quantum Corp buyer in Q3 2025 was UBS Group, an estimated $861K added.
  • The largest Quantum Corp seller in Q3 2025 was Marshall Wace, an estimated $1.77M sold.

Based on aggregated 13F filings for Q3 2025.