QUMS — Quantumsphere Acquisition Co Institutional Holders · Q2 2026

Name: Who Owns QUMS? 30 Institutions Hold $87.7M (Q2 2026)
Creator: ko.io

Who owns Quantumsphere Acquisition Co (QUMS)? 30 institutions reported holding $87.66M in SEC 13F filings for Q2 2026 (period ended 2026-06-30). Largest holders: Mizuho Securities USA LLC ($15.0M), Berkley W R Corp ($9.0M), Wolverine Asset Management LLC ($6.2M).

Rank	Institution	Value	Shares	Change
1	MIZUHO SECURITIES USA LLC	$15.0M	1.5M	Added
2	BERKLEY W R CORP	$9.0M	881,402	Added
3	WOLVERINE ASSET MANAGEMENT LLC	$6.2M	602,984	Trimmed
4	Karpus Management, Inc.	$4.8M	469,875	Trimmed
5	RIVERNORTH CAPITAL MANAGEMENT, LLC	$4.4M	424,124	Trimmed
6	D. E. Shaw & Co., Inc.	$4.2M	409,860	Hold
7	Shaolin Capital Management LLC	$4.1M	405,761	Trimmed
8	GLAZER CAPITAL, LLC	$4.1M	400,089	Trimmed
9	Linden Advisors LP	$4.1M	400,000	Hold
10	Polar Asset Management Partners Inc.	$4.1M	400,000	Hold
11	HIGHBRIDGE CAPITAL MANAGEMENT LLC	$3.9M	377,607	Added
12	Westchester Capital Management, LLC	$3.6M	350,000	Added
13	AQR Arbitrage LLC	$3.2M	312,523	Added
14	RLH Capital LLC	$2.6M	250,000	Added
15	Hudson Bay Capital Management LP	$2.4M	235,000	Hold
16	Cable Car Capital, LP	$1.8M	174,801	Hold
17	Clear Street Group Inc.	$1.7M	164,793	Trimmed
18	HEIGHTS CAPITAL MANAGEMENT, INC	$1.5M	150,000	Hold
19	Radcliffe Capital Management, L.P.	$1.5M	150,000	Hold
20	BNP PARIBAS FINANCIAL MARKETS	$1.2M	115,048	Hold
21	Crossingbridge Advisors, LLC	$1.1M	107,825	Hold
22	TORONTO DOMINION BANK	$1.0M	100,000	Trimmed
23	Periscope Capital Inc.	$766,500	75,000	Trimmed
24	Quarry LP	$766,500	75,000	New
25	Schonfeld Strategic Advisors LLC	$562,100	55,000	Hold

Source: SEC Form 13F filings · as of 2026-06-30