Quantum-Si QSI Institutional Ownership

NASDAQ QSI

$0.75 -0.01 (-0.86%)

As of: Sep 9, 2026 · 11:23 AM EDT

Institutions by Trading Activity

140 Institutions

Increased 61 43.6%

Unchanged 23 16.4%

Reduced 56 40.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

24.14%

▼-5.30 pp QoQ

Shares Held by Institutions

52.57Mn

of 217.80Mn outstanding

▼-14.98% QoQ

Shares Outstanding

217.80Mn

165.23Mn held outside 13F filers

Institutional Investors

140

filed 13F for Jun 2026

▼-16 vs prior quarter

Net Shares Added (QoQ)

-9.27Mn

distributed since last quarter

Value of Holdings

$40.48Mn

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 30 Jun, 2026

Quantum-Si Inc (NASDAQ:QSI) has 140 institutional investors with active 13F positions as of June 2026.

These investors collectively held 24.1% of Quantum-Si's outstanding shares in June 2026, down from 29.4% in March 2026.
They decreased total shares held in QSI by -14.98% quarter over quarter, and investors in Quantum-Si increased 5.26% from a year ago.
Of these 140 holders, 61 added to their stakes in Quantum-Si, 56 trimmed positions, and 23 made no changes.
Combined, these investors held 52.57Mn shares in QSI for June 2026, down by 9.27Mn shares quarter on quarter, and down 11.96Mn shares year over year.
As of June 30, 2026, VANGUARD CAPITAL MANAGEMENT LLC held the largest stake in Quantum-Si with 7.58Mn shares, accounting for 3.48% of total shares outstanding.
The biggest buyers of Quantum-Si for the quarter ending June 2026 included MILLENNIUM MANAGEMENT LLC (3.13Mn), JANE STREET GROUP, LLC (2.14Mn), UBS Group AG (859.37K), VANGUARD CAPITAL MANAGEMENT LLC (556.3K), RENAISSANCE TECHNOLOGIES LLC (435.97K).
The largest sales of QSI for the quarter ending June 2026 came from BlackRock, Inc. (8.19Mn), State Street Corp (2.88Mn), GEODE CAPITAL MANAGEMENT, LLC (1.6Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.02Mn), Northern Trust Corp (810.17K).
Quantum-Si's 10 largest shareholders as of June 2026 include VANGUARD CAPITAL MANAGEMENT LLC (7.58Mn), ARK Investment Management LLC (7.17Mn), BlackRock, Inc. (5.23Mn), Amova Asset Management Americas, Inc. (3.89Mn), Sumitomo Mitsui Trust Group, Inc. (3.89Mn), MILLENNIUM MANAGEMENT LLC (3.13Mn), UBS Group AG (2.56Mn), AQR CAPITAL MANAGEMENT LLC (2.35Mn), GEODE CAPITAL MANAGEMENT, LLC (2.24Mn), JANE STREET GROUP, LLC (2.14Mn) per Business Quant data.

Form 13F Holdings

140 Institutional Holders

Report period 30 Jun, 2026

Total shares held 52.57Mn

Of outstanding 24.14%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	7,578,208	3.48%	▲556,301	+7.92%	$6.71Mn
2	ARK Investment Management LLC	0001697748	7,167,738	3.29%	▲288,839	+4.20%	$6.34Mn
3	BlackRock, Inc.	0002012383	5,225,352	2.40%	▼8,189,597	-61.05%	$4.62Mn
4	Sumitomo Mitsui Trust Group, Inc.	0001475365	3,885,230	1.78%	▼506,436	-11.53%	$3.44Mn
4	Amova Asset Management Americas, Inc.	0001480751	3,885,230	1.78%	▼506,436	-11.53%	$3.46Mn
5	MILLENNIUM MANAGEMENT LLC	0001273087	3,131,726	1.44%	▲3,131,726	0.00%	$2.77Mn
6	UBS Group AG	0001610520	2,561,897	1.18%	▲859,370	+50.48%	$2.27Mn
7	AQR CAPITAL MANAGEMENT LLC	0001167557	2,348,665	1.08%	▼43,514	-1.82%	$2.08Mn
8	GEODE CAPITAL MANAGEMENT, LLC	0001214717	2,236,526	1.03%	▼1,598,595	-41.68%	$1.98Mn
9	JANE STREET GROUP, LLC	0001595888	2,142,735	0.98%	▲2,142,735	0.00%	$1.90Mn
10	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	1,116,750	0.51%	▼347,818	-23.75%	$988.32K
11	VANGUARD FIDUCIARY TRUST CO	0000933478	1,116,683	0.51%	▼569	-0.05%	$988.26K
12	State Street Corp	0000093751	890,741	0.41%	▼2,879,948	-76.38%	$788.31K
13	Fosun International Ltd	0001447884	743,935	0.34%	0	0.00%	$658.38K
14	RENAISSANCE TECHNOLOGIES LLC	0001037389	553,871	0.25%	▲435,971	+369.78%	$490.18K
15	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	497,098	0.23%	▼1,023,548	-67.31%	$439.93K
16	Goldman Sachs Group Inc	0000886982	476,288	0.22%	▲32,111	+7.23%	$421.52K
17	Northern Trust Corp	0000073124	450,531	0.21%	▼810,170	-64.26%	$398.72K
18	Invesco Ltd.	0000914208	443,929	0.20%	▲37,239	+9.16%	$392.88K
19	BNP PARIBAS FINANCIAL MARKETS	0001166588	398,598	0.18%	▲360,208	+938.29%	$352.76K

Showing 1 to 20 of 140 holders