Quantum-Si Ownership | Who Owns Quantum-Si?

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Quantum-Si Ownership Summary

Quantum-Si is owned by 24.45% institutional investors, 10.45% insiders, and 65.09% retail investors. Blackrock is the largest institutional shareholder, holding 4.94% of QSI shares. ARK Genomic Revolution ETF is the top mutual fund, with 3.13% of its assets in Quantum-Si shares.

QSI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quantum-Si	24.45%	10.45%	65.09%
Sector	Healthcare Stocks	246.48%	12.12%	-158.60%
Industry	Medical Device Stocks	52.58%	12.61%	34.81%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	7.00M	4.94%	$7.35M
Vanguard group	9.61M	4.60%	$10.57M
Vanguard capital management	7.58M	3.50%	$6.71M
Ark investment management	7.17M	3.31%	$6.34M
Blackrock funding, inc. /de	5.23M	2.41%	$4.62M
Nikko asset management americas	3.89M	1.79%	$3.46M
Sumitomo mitsui trust	3.71M	1.71%	$3.97M
Millennium management	3.13M	1.45%	$2.77M
Ubs group	2.56M	1.18%	$2.27M
Aqr capital management	2.35M	1.08%	$2.08M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Fosun	743.93K	0.15%	$658.38K
Nikko asset management americas	3.89M	0.04%	$3.46M
Aster capital management (difc)	344.51K	0.04%	$304.89K
Ark investment management	7.17M	0.04%	$6.34M
Green alpha advisors	45.92K	0.03%	$40.64K
Knollwood investment advisory	300.00K	0.02%	$265.50K
Iq eq fund management (ireland)	321.13K	0.02%	$284.20K
Shay capital	150.92K	0.01%	$133.57K
Dlk investment management	19.00K	0.01%	$19.95K
Red wave investments	37.00K	0.01%	$32.74K

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	3.13M	0.00%	3.13M
Jane street group	2.14M	0.00%	2.14M
Vanguard group	9.61M	0.00%	892.51K
Ubs group	2.56M	0.00%	859.37K
Vanguard capital management	7.58M	0.00%	556.30K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	5.23M	0.00%	-8.19M
State street	890.74K	-	-2.88M
Geode capital management	2.24M	0.00%	-1.60M
Northern trust	450.53K	-	-810.17K
Squarepoint ops	-	-	-613.48K

New Positions

Holder	Shares	% Assets	Change	Value
Aster capital management (difc)	344.51K	0.04%	344.51K	$304.89K
Sixth street partners management company	84.61K	-	84.61K	$74.88K
Y-intercept (hong kong)	79.09K	0.00%	79.09K	$69.99K
Winton group	75.80K	0.00%	75.80K	$67.08K
Gsa capital partners llp	60.01K	0.00%	60.01K	$53.00K

Sold Out

Holder	Change
Kilter group	-4.00
Founders capital management	-100.00
American capital advisory	-100.00
Parkside financial bank & trust	-150.00
Sjs investment consulting	-185.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	147	-9.82%	52,935,273	-16.09%	24	2.88%	61	-25.61%	59	63.89%
Mar 31, 2026	157	8.28%	63,473,781	-5.96%	32	3.08%	78	8.33%	35	-7.89%
Dec 31, 2025	68	-49.25%	48,291,272	-25.28%	23	1.86%	31	-45.61%	19	-53.66%
Sep 30, 2025	68	-52.11%	45,792,034	-28.79%	24	2.03%	32	-55.56%	18	-41.94%
Jun 30, 2025	142	-1.39%	64,328,730	11.47%	35	3.50%	72	-5.26%	31	-13.89%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution ETF	6.85M	3.13%	16.75K
ARK Genomic Revolution	6.79M	3.12%	259.69K
Vanguard Total Stock Mkt Idx Inv	5.35M	2.46%	479.20K
Vanguard Morn Total Stk Mkt Idx Investor	5.35M	2.46%	479.20K
Vanguard MStar Total Stk Mkt Idx Invest	5.35M	2.45%	-
Nikko AM ARK Pstv Chg Innovt P JPY Acc	4.52M	2.24%	-60.89K
iShares Russell 2000 ETF	4.07M	1.87%	37.60K
Nikko Gbl All Biological Genome Eq MF	2.02M	1.42%	-343.46K
Amova ARK Pstv Chg Innovt P JPY Acc	3.04M	1.39%	-157.31K
Vanguard Institutional Extnd Mkt Idx Tr	2.07M	0.95%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 21, 2026	Hawkins Jeffrey Alan	President & CEO	Sell	$15.22K
Sep 22, 2026	Hawkins Jeffrey Alan	President & CEO	Sell	$7.39K
Sep 22, 2026	Keyes Jeffry R.	Chief Financial Officer	Sell	$1.90K
Sep 21, 2026	Keyes Jeffry R.	Chief Financial Officer	Sell	$3.91K
Sep 21, 2026	LaPointe Christian	GC & Corp. Secretary	Sell	$7.40K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	6
2026 Q2	-	12
2026 Q1	2	8
2025 Q4	-	5
2025 Q3	-	10

QSI Ownership FAQ

Who Owns Quantum-Si?

Quantum-Si shareholders are primarily institutional investors at 24.45%, followed by 10.45% insiders and 65.10% retail investors. The average institutional ownership in Quantum-Si's industry, Medical Device Stocks, is 52.58%, which Quantum-Si falls below.

Who owns the most shares of Quantum-Si?

Quantum-Si’s largest shareholders are Blackrock (7M shares, 4.94%), Vanguard group (9.61M shares, 4.60%), and Vanguard capital management (7.58M shares, 3.50%). Together, they hold 13.03% of Quantum-Si’s total shares outstanding.

Does Blackrock own Quantum-Si?

Yes, BlackRock owns 4.94% of Quantum-Si, totaling 7M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 7.35M$. In the last quarter, BlackRock decreased its holdings by -231K shares, a -3.20% change.

Who is Quantum-Si’s biggest shareholder by percentage of total assets invested?

Fosun is Quantum-Si’s biggest shareholder by percentage of total assets invested, with 0.15% of its assets in 743.94K Quantum-Si shares, valued at 658.38K$.

Who is the top mutual fund holder of Quantum-Si shares?

ARK Genomic Revolution ETF is the top mutual fund holder of Quantum-Si shares, with 3.13% of its total shares outstanding invested in 6.85M Quantum-Si shares.

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