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Quantumsphere Acquisition Corp
QUMSUAdd to Watchlist
10.415USD
0.0000.00%
Close 07/02, 13:00（ET）Quotes delayed by 15 min
116.58MMarket Cap
--P/E TTM
Shareholding Stats
Updated: Mon, Apr 27
Updated: Mon, Apr 27
Shareholders
Shareholder Types
Shareholders
Shareholders
Proportion
RiverNorth Capital Management LLC
3.72%
Polar Asset Management Partners Inc.
3.51%
Whiteowl Holdings LLC
2.00%
Gabelli Funds, LLC
1.10%
Westchester Capital Management, LLC
0.88%
Other
88.79%
Shareholders
Shareholders
Proportion
RiverNorth Capital Management LLC
3.72%
Polar Asset Management Partners Inc.
3.51%
Whiteowl Holdings LLC
2.00%
Gabelli Funds, LLC
1.10%
Westchester Capital Management, LLC
0.88%
Other
88.79%
Shareholder Types
Shareholders
Proportion
Investment Advisor/Hedge Fund
5.73%
Hedge Fund
3.51%
Corporation
2.00%
Investment Advisor
1.30%
Research Firm
0.09%
Other
87.37%
Institutional Shareholding
Updated: Wed, Apr 1
Updated: Wed, Apr 1
Reporting Period
No. of institutions
Shares Held
Proportion
Change
2026Q4
32
5.61M
0.54%
--
2026Q1
34
1.21M
10.63%
-4.36M
2025Q4
33
5.45M
47.74%
+5.10M
2025Q3
5
172.06K
1.51%
+110.00K
Shareholder Activity
Name
Shares Held
Proportion
Change
Chg %
Date
RiverNorth Capital Management LLC
424.51K
3.72%
-488.00
-0.11%
Dec 31, 2025
Polar Asset Management Partners Inc.
400.00K
3.51%
--
--
Dec 31, 2025
Whiteowl Holdings LLC
228.65K
2%
+228.65K
--
Aug 07, 2025
Gabelli Funds, LLC
125.00K
1.1%
--
--
Dec 31, 2025
Westchester Capital Management, LLC
100.00K
0.88%
--
--
Dec 31, 2025
ATW Spac Management LLC
100.00K
0.88%
+100.00K
--
Sep 30, 2025
HRT Financial LP
31.09K
0.27%
+1.10K
+3.68%
Dec 31, 2025
Clear Street Group Inc
14.87K
0.13%
-203.19K
-93.18%
Dec 31, 2025
J.P. Morgan Securities LLC
10.00K
0.09%
--
--
Dec 31, 2025
Lazard Asset Management, L.L.C.
4.58K
0.04%
--
--
Dec 31, 2025
View more
Related ETFs
Updated: Sat, Dec 6
Updated: Sat, Dec 6
Name
Proportion
RiverNorth Enhanced Pre-Merger SPAC ETF
2.04%
CrossingBridge Pre-Merger SPAC ETF
0%
RiverNorth Enhanced Pre-Merger SPAC ETF
Proportion2.04%
CrossingBridge Pre-Merger SPAC ETF
Proportion0%