Quantumsphere Acquisition QUMS Institutional Ownership

NASDAQ QUMS

$10.32 -0.01 (-0.10%)

As of: Aug 26, 2026 · 2:15 PM EDT

Institutions by Trading Activity

30 Institutions

Increased 12 40.0%

Unchanged 11 36.7%

Reduced 7 23.3%

Ownership Statistics

13F · as of 31 Mar, 2026

Institutional Ownership

143.39%

▲+64.06 pp QoQ

Shares Held by Institutions

7.68Mn

of 5.35Mn outstanding

▲+17.61% QoQ

Shares Outstanding

5.35Mn

-2.32Mn held outside 13F filers

Institutional Investors

filed 13F for Mar 2026

▲+5 vs prior quarter

Net Shares Added (QoQ)

+1.15Mn

accumulated since last quarter

Value of Holdings

$79.22Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 31 Mar, 2026

Quantumsphere Acquisition Corp (NASDAQ:QUMS) has 30 institutional investors that have filed 13F reports for the period ending March 2026.

Their combined ownership stood at 143.4% of outstanding shares in March 2026, up from 79.3% in December 2025.
They increased total shares held in Quantumsphere Acquisition by 17.61% from the prior quarter, while the number of investors in QUMS stayed flat year over year.
During the quarter, 12 of these 30 funds increased positions in QUMS, 7 reduced exposure, and 11 held steady.
The aggregate institutional position in Quantumsphere Acquisition amounted to 7.68Mn shares as of March 2026, up by 1.15Mn shares quarter on quarter, and with no net change year over year.
MIZUHO SECURITIES USA LLC leads ownership in QUMS with 731.98K shares as of March 31, 2026, equal to 13.67% of outstanding shares.
The largest buyers of Quantumsphere Acquisition for the quarter ending March 2026 were RIVERNORTH CAPITAL MANAGEMENT, LLC (424.51K), Polar Asset Management Partners Inc. (400.0K), Berkley W R Corp (204.96K), HIGHBRIDGE CAPITAL MANAGEMENT LLC (121.08K), Jpmorgan Chase & Co (121.08K).
The biggest sellers of Quantumsphere Acquisition for the quarter ending March 2026 included Clear Street Group Inc. (249.76K), TWO SIGMA INVESTMENTS, LP (182.19K), PERISCOPE CAPITAL INC. (25.0K), AQR Arbitrage LLC (14.37K), Virtu Financial LLC (2.48K).
Per Business Quant data, the top 10 holders of Quantumsphere Acquisition for the quarter ending March 2026 are MIZUHO SECURITIES USA LLC (731.98K), WOLVERINE ASSET MANAGEMENT LLC (603.98K), Berkley W R Corp (508.54K), Karpus Management, Inc. (493.88K), Shaolin Capital Management LLC (480.0K), RIVERNORTH CAPITAL MANAGEMENT, LLC (424.51K), GLAZER CAPITAL, LLC (423.02K), D. E. Shaw & Co., Inc. (409.86K), LINDEN ADVISORS LP (400.0K), Polar Asset Management Partners Inc. (400.0K).

Form 13F Holdings

30 Institutional Holders

Report period 31 Mar, 2026

Total shares held 7.68Mn

Of outstanding 143.39%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	MIZUHO SECURITIES USA LLC	0000812291	731,984	13.67%	▲13,898	+1.94%	$7.36Mn
2	WOLVERINE ASSET MANAGEMENT LLC	0001279891	603,984	11.28%	▲28,762	+5.00%	$6.11Mn
3	Berkley W R Corp	0000011544	508,540	9.50%	▲204,960	+67.51%	$5.15Mn
4	Karpus Management, Inc.	0001048703	493,875	9.23%	▼475	-0.10%	$5.00Mn
5	Shaolin Capital Management LLC	0001766806	480,000	8.97%	0	0.00%	$4.86Mn
6	RIVERNORTH CAPITAL MANAGEMENT, LLC	0001447578	424,512	7.93%	▲424,512	0.00%	$4.30Mn
7	GLAZER CAPITAL, LLC	0001076809	423,019	7.90%	▼1,134	-0.27%	$4.28K
8	D. E. Shaw & Co., Inc.	0001009207	409,860	7.66%	0	0.00%	$4.15Mn
9	LINDEN ADVISORS LP	0001279396	400,000	7.47%	0	0.00%	$4.05Mn
9	Polar Asset Management Partners Inc.	0001326389	400,000	7.47%	▲400,000	0.00%	$4.05Mn
10	AQR Arbitrage LLC	0001167456	308,294	5.76%	▼14,366	-4.45%	$3.12Mn
11	HGC Investment Management Inc.	0001711200	300,000	5.60%	0	0.00%	$3.04Mn
12	Toronto Dominion Bank	0000947263	265,600	4.96%	▲89,822	+51.10%	$2.69Mn
13	Westchester Capital Management, LLC	0001512805	250,000	4.67%	0	0.00%	$2.53Mn
14	Hudson Bay Capital Management LP	0001393825	235,000	4.39%	0	0.00%	$2.38Mn
15	Clear Street Group Inc.	0001881567	175,001	3.27%	▼249,761	-58.80%	$1.77Mn
16	Cable Car Capital, LP	0001699575	174,801	3.27%	0	0.00%	$1.77Mn
17	Radcliffe Capital Management, L.P.	0001218275	150,000	2.80%	0	0.00%	$1.52Mn
17	HEIGHTS CAPITAL MANAGEMENT, INC	0001081698	150,000	2.80%	0	0.00%	$1.52Mn
18	HIGHBRIDGE CAPITAL MANAGEMENT LLC	0000919185	121,078	2.26%	▲121,078	0.00%	$1.23Mn

Showing 1 to 20 of 30 holders