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QUMSU

Quantumsphere Acquisition Corp Units
QUMSU

9 hedge funds and large institutions have $11.3M invested in Quantumsphere Acquisition Corp Units in 2025 Q4 according to their latest regulatory filings, with 1 funds opening new positions, 1 increasing their positions, 2 reducing their positions, and 21 closing their positions.

New
Increased
Maintained
Reduced
Closed

39.38% less ownership

Funds ownership: 49.08% → 9.7% (-39%)

50% less repeat investments, than reductions

Existing positions increased: 1 | Existing positions reduced: 2

70% less funds holding

Funds holding: 30 → 9 (-21)

80% less capital invested

Capital invested by funds: $56.7M → $11.3M (-$45.5M)

95% less first-time investments, than exits

New positions opened: 1 | Existing positions closed: 21

Holders
9
Holders Change
-21
Holders Change %
-70%
% of All Funds
0.11%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
1
Increased
1
Reduced
2
Closed
21
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
HF
HRT Financial
New York
+$11.2K
2
UBS Group
UBS Group
Switzerland
+$4.68K

Top Sellers

Rank Fund Capital Flow
1
GCL
Glazer Capital LLC
New York
-$4.26M
2
HCI
Harraden Circle Investments
New York
-$4.06M
3
LA
Linden Advisors
New York
-$4.05M
4
Toronto Dominion Bank
Toronto Dominion Bank
Ontario, Canada
-$3.66M
5
AA
AQR Arbitrage
Connecticut
-$3.27M
Name Holding Trade Value Shares
Change 		Change in
Stake
RCM
1
Rivernorth Capital Management
Florida
$4.32M -$4.97K -488 -0.1%
PAMP
2
Polar Asset Management Partners
Ontario, Canada
$4.07M – – –
WCMNY
3
Westchester Capital Management (New York)
New York
$1.02M – – –
GCIA
4
Gabelli & Co Investment Advisers
New York
$689K – – –
GF
5
Gabelli Funds
New York
$583K – – –
HF
6
HRT Financial
New York
$316K +$11.2K +1,104 +4%
CS
7
Clear Street
New York
$151K -$2.07M -203,191 -93%
JP Morgan Chase
8
JP Morgan Chase
New York
$102K – – –
UBS Group
9
UBS Group
Switzerland
$4.67K +$4.68K +459 New
GCL
10
Glazer Capital LLC
New York
– -$4.26M -420,542 Closed
HCI
11
Harraden Circle Investments
New York
– -$4.06M -400,707 Closed
LA
12
Linden Advisors
New York
– -$4.05M -400,000 Closed
Toronto Dominion Bank
13
Toronto Dominion Bank
Ontario, Canada
– -$3.66M -361,000 Closed
AA
14
AQR Arbitrage
Connecticut
– -$3.27M -322,660 Closed
HIM
15
HGC Investment Management
Ontario, Canada
– -$3.04M -300,000 Closed
MC
16
Meteora Capital
Florida
– -$2.33M -229,999 Closed
Two Sigma Investments
17
Two Sigma Investments
New York
– -$2.25M -222,490 Closed
CCC
18
Cable Car Capital
California
– -$1.77M -174,801 Closed
SG
19
StoneX Group
New York
– -$1.7M -168,149 Closed
HCM
20
Heights Capital Management
California
– -$1.52M -150,000 Closed
RCM
21
Radcliffe Capital Management
Pennsylvania
– -$1.52M -150,000 Closed
WAM
22
Wolverine Asset Management
Illinois
– -$1.52M -150,000 Closed
WRBC
23
W.R. Berkley Corp
Connecticut
– -$1.51M -148,770 Closed
D.E. Shaw & Co
24
D.E. Shaw & Co
New York
– -$1.27M -125,000 Closed
PC
25
Periscope Capital
Ontario, Canada
– -$1.27M -125,000 Closed
1
2

QUMSU Hedge Fund Activity: Q4 2025 in Review

9 of the 8,226 institutional investors tracked by Wall St. Rank reported a position in Quantumsphere Acquisition Corp Units (QUMSU) for Q4 2025, worth a combined $11.3M — down 80% from $56.7M a quarter earlier.

Sellers outnumbered buyers: 21 funds closed out of QUMSU and 1 opened new positions — a net loss of 20 holders — while 2 trimmed existing stakes and 1 added.

The largest buyer was HRT Financial, adding an estimated $11.2K. The largest seller was Glazer Capital LLC, exiting entirely with an estimated $4.26M sold.

  • 9 institutional investors held Quantumsphere Acquisition Corp Units (QUMSU) as of Q4 2025, down from 30 in Q3 2025.
  • Funds reported $11.3M of Quantumsphere Acquisition Corp Units stock for Q4 2025, down 80% quarter-over-quarter.
  • 1 fund opened new Quantumsphere Acquisition Corp Units positions in Q4 2025 and 21 closed out, a net change of -20 holders.
  • The largest Quantumsphere Acquisition Corp Units buyer in Q4 2025 was HRT Financial, an estimated $11.2K added.
  • The largest Quantumsphere Acquisition Corp Units seller in Q4 2025 was Glazer Capital LLC, an estimated $4.26M sold.

Based on aggregated 13F filings for Q4 2025.