Quantum-Si Inc (QSI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

174,401,493Shares Outstanding

1,806,379Shares held by institutions

$1,788,315Value of institutional holdings

32.12%Institutional ownership %

5.83%Shares Changed QoQ

100No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Recent 13F filings as of December 2025 show that 100 institutional investors hold a position in Quantum-Si Inc (NASDAQ:QSI).

These investors collectively held 32.1% of the company's total shares outstanding in December 2025, down from 37.0% in September 2025.
In percentage terms, this reflects as a holdings change of 5.83% quarter on quarter, and a decrease of 13.04% year over year.
A review of institutional activity for Quantum-Si shows 48 of 100 filers increasing their positions, while 27 reduced their stake, and 25 remained unchanged.
This class of investors increased its holdings in Quantum-Si to 56.02Mn shares for the 13F-cycle ending December 2025, up by 3.09Mn shares quarter on quarter, and up 2.42Mn shares year over year.
As of December 31, 2025, BlackRock, Inc. held Quantum-Si's largest shareholding position with over 13.05Mn shares, representing 7.49% of total outstanding shares.
Among the most significant buyers of Quantum-Si during December 2025 were BlackRock, Inc. (1.73Mn), UBS Group AG (944.65K), VANGUARD GROUP INC (892.51K), STATE STREET CORP (745.23K), GEODE CAPITAL MANAGEMENT, LLC (367.21K).
Leading sellers of Quantum-Si stock in December 2025 included ARK Investment Management LLC (602.47K), Sumitomo Mitsui Trust Group, Inc. (526.78K), Amova Asset Management Americas, Inc. (526.78K), JANE STREET GROUP, LLC (251.39K), Green Alpha Advisors, LLC (164.50K).
The top 10 institutional holders of Quantum-Si for the quarter ending December 2025 included BlackRock, Inc. (13.05Mn), VANGUARD GROUP INC (9.61Mn), ARK Investment Management LLC (7.02Mn), Sumitomo Mitsui Trust Group, Inc. (4.69Mn), Amova Asset Management Americas, Inc. (4.69Mn), GEODE CAPITAL MANAGEMENT, LLC (4.11Mn), STATE STREET CORP (3.56Mn), UBS Group AG (1.45Mn), JANE STREET GROUP, LLC (1.43Mn), Fosun International Ltd (743.93K).

100 Institutional Holders

1,806,379 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	13,054,057	1,732,384	15.30%	$14,359,463.00
VANGUARD GROUP INC	31 Dec, 2025	9,607,022	892,515	10.24%	$10,567,724.00
ARK Investment Management LLC	31 Dec, 2025	7,021,571	-602,471	-7.90%	$7,723,728.00
Sumitomo Mitsui Trust Group, Inc.	31 Dec, 2025	4,690,720	-526,779	-10.10%	$5,159,792.00
Amova Asset Management Americas, Inc.	31 Dec, 2025	4,690,720	-526,779	-10.10%	$5,112,885.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	4,114,375	367,206	9.80%	$4,526,616.00
STATE STREET CORP	31 Dec, 2025	3,562,721	745,231	26.45%	$3,918,993.00
UBS Group AG	31 Dec, 2025	1,449,512	944,653	187.11%	$1,594,464.00
JANE STREET GROUP, LLC	31 Dec, 2025	1,434,833	-251,390	-14.91%	$1,578,316.00
Fosun International Ltd	31 Dec, 2025	743,935	0	0.00%	$818,329.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	468,174	86	0.02%	$514,991.00
Nuveen, LLC	31 Dec, 2025	447,519	0	0.00%	$492,271.00
Bank of New York Mellon Corp	31 Dec, 2025	406,291	11,386	2.88%	$446,920.00
MORGAN STANLEY	31 Dec, 2025	399,994	128,994	47.60%	$439,994.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	386,824	-327	-0.08%	$425,507.00
Knollwood Investment Advisory, LLC	31 Dec, 2025	300,000	0	0.00%	$330,000.00
BARCLAYS PLC	31 Dec, 2025	269,415	48,205	21.79%	$296,357.00
IQ EQ FUND MANAGEMENT (IRELAND) Ltd	31 Dec, 2025	253,895	64,721	34.21%	$279,285.00
GROUP ONE TRADING LLC	31 Dec, 2025	245,801	-131,973	-34.93%	$270,381.00
RHUMBLINE ADVISERS	31 Dec, 2025	193,595	-26,370	-11.99%	$212,948.00

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