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QUMSU

Quantumsphere Acquisition Corp Units
QUMSU

30 hedge funds and large institutions have $56.7M invested in Quantumsphere Acquisition Corp Units in 2025 Q3 according to their latest regulatory filings, with 30 funds opening new positions, increasing their positions, reducing their positions, and closing their positions.

New
Increased
Maintained
Reduced
Closed

49.08% more ownership

Funds ownership: 0% → 49.08% (+49%)

Holders
30
Holders Change
+30
Holders Change %
–
% of All Funds
0.39%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
30
Increased
–
Reduced
–
Closed
–
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
RCM
Rivernorth Capital Management
Florida
+$4.27M
2
GCL
Glazer Capital LLC
New York
+$4.23M
3
HCI
Harraden Circle Investments
New York
+$4.03M
4
LA
Linden Advisors
New York
+$4.02M
5
PAMP
Polar Asset Management Partners
Ontario, Canada
+$4.02M

Top Sellers

No sellers this quarter
Name Holding Trade Value Shares
Change 		Change in
Stake
RCM
1
Rivernorth Capital Management
Florida
$4.31M +$4.27M +425,000 New
GCL
2
Glazer Capital LLC
New York
$4.26M +$4.23M +420,542 New
HCI
3
Harraden Circle Investments
New York
$4.06M +$4.03M +400,707 New
LA
4
Linden Advisors
New York
$4.05M +$4.02M +400,000 New
PAMP
5
Polar Asset Management Partners
Ontario, Canada
$4.05M +$4.02M +400,000 New
Toronto Dominion Bank
6
Toronto Dominion Bank
Ontario, Canada
$3.66M +$3.63M +361,000 New
AA
7
AQR Arbitrage
Connecticut
$3.27M +$3.24M +322,660 New
HIM
8
HGC Investment Management
Ontario, Canada
$3.04M +$3.01M +300,000 New
MC
9
Meteora Capital
Florida
$2.33M +$2.31M +229,999 New
Two Sigma Investments
10
Two Sigma Investments
New York
$2.25M +$2.24M +222,490 New
CS
11
Clear Street
New York
$2.21M +$2.19M +218,057 New
CCC
12
Cable Car Capital
California
$1.77M +$1.76M +174,801 New
SG
13
StoneX Group
New York
$1.7M +$1.69M +168,149 New
HCM
14
Heights Capital Management
California
$1.52M +$1.51M +150,000 New
RCM
15
Radcliffe Capital Management
Pennsylvania
$1.52M +$1.51M +150,000 New
WAM
16
Wolverine Asset Management
Illinois
$1.52M +$1.51M +150,000 New
WRBC
17
W.R. Berkley Corp
Connecticut
$1.51M +$1.5M +148,770 New
D.E. Shaw & Co
18
D.E. Shaw & Co
New York
$1.27M +$1.26M +125,000 New
PC
19
Periscope Capital
Ontario, Canada
$1.27M +$1.26M +125,000 New
BNP Paribas Financial Markets
20
BNP Paribas Financial Markets
France
$1.04M +$1.03M +102,340 New
ASM
21
ATW SPAC Management
New York
$1.01M +$1M +100,000 New
BFM
22
Boothbay Fund Management
New York
$1.01M +$1M +100,000 New
WCMNY
23
Westchester Capital Management (New York)
New York
$1.01M +$1M +100,000 New
SSA
24
Schonfeld Strategic Advisors
New York
$886K +$879K +87,486 New
GCIA
25
Gabelli & Co Investment Advisers
New York
$686K +$680K +67,700 New
1
2

QUMSU Hedge Fund Activity: Q3 2025 in Review

30 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Quantumsphere Acquisition Corp Units (QUMSU) for Q3 2025, worth a combined $56.7M.

Buyers outnumbered sellers: 30 funds opened new QUMSU positions and 0 closed out — a net gain of 30 holders — while 0 added to existing stakes and 0 trimmed.

The largest buyer was Rivernorth Capital Management, opening a new position worth an estimated $4.27M.

  • 30 institutional investors held Quantumsphere Acquisition Corp Units (QUMSU) as of Q3 2025, up from 0 in Q2 2025.
  • Funds reported $56.7M of Quantumsphere Acquisition Corp Units stock for Q3 2025.
  • 30 funds opened new Quantumsphere Acquisition Corp Units positions in Q3 2025 and 0 closed out, a net change of +30 holders.
  • The largest Quantumsphere Acquisition Corp Units buyer in Q3 2025 was Rivernorth Capital Management, an estimated $4.27M added.

Based on aggregated 13F filings for Q3 2025.