Who Owns QUANTUM SI INC (QSI)? -- Institutional Holders (2026-06-30)

180 institutions reported holding $47.7M of QUANTUM SI INC (QSI) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($8.2M), ARK Investment Management LLC ($6.3M), BlackRock, Inc. ($4.6M), Amova Asset Management Americas, Inc. ($3.5M), Sumitomo Mitsui Trust Group, Inc. ($3.4M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	VANGUARD GROUP INC	$8.2M	9.3M	Trimmed
2	ARK Investment Management LLC	$6.3M	7.2M	Added
3	BlackRock, Inc.	$4.6M	5.2M	Trimmed
4	Amova Asset Management Americas, Inc.	$3.5M	3.9M	Trimmed
5	Sumitomo Mitsui Trust Group, Inc.	$3.4M	3.9M	Trimmed
6	MILLENNIUM MANAGEMENT LLC	$2.8M	3.1M	New
7	UBS Group AG	$2.3M	2.6M	Added
8	JANE STREET GROUP, LLC	$2.1M	2.4M	Added
9	AQR CAPITAL MANAGEMENT LLC	$2.1M	2.3M	Trimmed
10	GEODE CAPITAL MANAGEMENT, LLC	$2.0M	2.2M	Trimmed
11	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$1.4M	1.5M	Trimmed
12	STATE STREET CORP	$788,306	890,741	Trimmed
13	Fosun International Ltd	$658,382	743,935	Hold
14	RENAISSANCE TECHNOLOGIES LLC	$490,176	553,871	Added
15	GOLDMAN SACHS GROUP INC	$421,515	476,288	Added
16	NORTHERN TRUST CORP	$398,720	450,531	Trimmed
17	Invesco Ltd.	$392,877	443,929	Added
18	BNP PARIBAS FINANCIAL MARKETS	$352,759	398,598	Added
19	IEQ CAPITAL, LLC	$310,472	350,816	Trimmed
20	Aster Capital Management (DIFC) Ltd	$304,891	344,510	New
21	CITADEL ADVISORS LLC	$294,647	332,935	Added
22	MORGAN STANLEY	$286,282	323,482	Added
23	IQ EQ FUND MANAGEMENT (IRELAND) Ltd	$284,204	321,134	Added
24	Knollwood Investment Advisory, LLC	$265,500	300,000	Hold
25	IMC-Chicago, LLC	$252,896	285,758	Added

来源：SEC 13F 申报文件 · 截至 2026-06-30