QUMSR — Quantumsphere Acquisition Co Institutional Holders · Q2 2026

Name: Who Owns QUMSR? 25 Institutions Hold $1.18M (Q2 2026)
Creator: ko.io

Who owns Quantumsphere Acquisition Co (QUMSR)? 25 institutions reported holding $1.18M in SEC 13F filings for Q2 2026 (period ended 2026-06-30). Largest holders: Harraden Circle Investments, LLC ($197,791), Toronto Dominion Bank ($142,863), Shaolin Capital Management LLC ($95,396).

Rank	Institution	Value	Shares	Change
1	Harraden Circle Investments, LLC	$197,791	993,926	Hold
2	TORONTO DOMINION BANK	$142,863	717,905	Added
3	Shaolin Capital Management LLC	$95,396	479,379	Added
4	GLAZER CAPITAL, LLC	$68,000	420,536	Hold
5	RIVERNORTH CAPITAL MANAGEMENT, LLC	$65,842	424,512	Hold
6	AQR Arbitrage LLC	$64,525	324,248	Added
7	Linden Advisors LP	$64,280	400,000	Hold
8	Polar Asset Management Partners Inc.	$64,280	400,000	Hold
9	HGC Investment Management Inc.	$59,700	300,000	Hold
10	HIGHBRIDGE CAPITAL MANAGEMENT LLC	$52,244	307,316	Trimmed
11	Clear Street Group Inc.	$44,254	222,380	Trimmed
12	Cable Car Capital, LP	$34,785	174,801	Hold
13	RLH Capital LLC	$29,713	184,900	Hold
14	WOLVERINE ASSET MANAGEMENT LLC	$26,378	132,552	Trimmed
15	Hudson Bay Capital Management LP	$25,500	150,000	Hold
16	Radcliffe Capital Management, L.P.	$24,105	150,000	Hold
17	HEIGHTS CAPITAL MANAGEMENT, INC	$21,287	106,968	Trimmed
18	D. E. Shaw & Co., Inc.	$21,250	125,000	Hold
19	Periscope Capital Inc.	$20,088	125,000	Hold
20	BNP PARIBAS FINANCIAL MARKETS	$16,374	102,340	Hold
21	BOOTHBAY FUND MANAGEMENT, LLC	$16,070	100,000	Hold
22	Westchester Capital Management, LLC	$12,250	100,000	New
23	Schonfeld Strategic Advisors LLC	$8,709	54,200	Trimmed
24	BERKLEY W R CORP	$3,874	24,108	Trimmed
25	UBS Group AG	$1,955	16,027	Hold

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