Quantum-Si Ownership | Who Owns Quantum-Si?

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Quantum-Si Ownership Summary

Quantum-Si is owned by 32.10% institutional investors, 10.51% insiders, and 57.39% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 6.78% of QSI shares. ARK Genomic Revolution ETF is the top mutual fund, with 3.20% of its assets in Quantum-Si shares.

QSI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quantum-Si	32.10%	10.51%	57.39%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Biotech Stocks	35.75%	11.83%	52.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	13.41M	6.78%	$10.38M
Blackrock	7.00M	4.94%	$7.35M
Vanguard group	9.61M	4.60%	$10.57M
Ark investment management	6.88M	3.48%	$5.32M
Nikko asset management americas	4.39M	2.22%	$3.43M
Sumitomo mitsui trust	4.39M	2.22%	$3.40M
Geode capital management	3.84M	1.94%	$2.97M
State street	3.77M	1.91%	$2.92M
Aqr capital management	2.39M	1.21%	$1.85M
Ubs group	1.70M	0.86%	$1.32M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Eversource wealth advisors	627.08K	0.74%	$24.37M
Fosun	743.93K	0.14%	$575.81K
Nikko asset management americas	4.39M	0.05%	$3.43M
Ark investment management	6.88M	0.04%	$5.32M
Green alpha advisors	43.21K	0.03%	$33.44K
Knollwood investment advisory	300.00K	0.02%	$232.20K
Iq eq fund management (ireland)	292.11K	0.02%	$226.09K
Ground swell capital	10.13K	0.02%	$7.84K
Shay capital	150.92K	0.01%	$116.81K
Verdence capital advisors	203.85K	0.01%	$157.78K

Top Buyers

Holder	Shares	% Assets	Change
Aqr capital management	2.39M	0.00%	2.31M
Vanguard fiduciary trust	1.12M	0.00%	1.12M
Vanguard group	9.61M	0.00%	892.51K
Eversource wealth advisors	627.08K	0.74%	626.65K
Jacobs levy equity management	942.76K	0.00%	436.06K

Top Sellers

Holder	Shares	% Assets	Change
Citadel advisors	15.55K	-	-2.66M
Two sigma investments, lp	52.92K	-	-1.33M
Jane street group	-	-	-1.10M
Northern trust	1.26M	0.00%	-947.24K
Susquehanna group, llp	1.46M	0.00%	-863.22K

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	1.12M	0.00%	1.12M	$864.75K
Ieq capital	357.69K	0.00%	357.69K	$276.85K
Renaissance	117.90K	0.00%	117.90K	$91.25K
Wealth enhancement advisory services	89.54K	0.00%	89.54K	$57.87K
Vanguard global advisers	84.76K	-	84.76K	$65.60K

Sold Out

Holder	Change
American capital advisory	-100.00
Founders capital management	-100.00
Parkside financial bank & trust	-150.00
Atlantic union bankshares	-251.00
Eagle bay advisors	-277.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	4	-96.95%	3,968,868	-92.60%	2	0.20%	2	-97.40%	1	-95.45%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution ETF	6.93M	3.20%	293.19K
ARK Genomic Revolution	6.53M	3.02%	-201.05K
Vanguard Total Stock Mkt Idx Inv	4.87M	2.24%	-
Nikko AM ARK Pstv Chg Innovt P JPY Acc	4.52M	2.24%	-60.89K
iShares Russell 2000 ETF	4.03M	1.86%	33.98K
Amova ARK Pstv Chg Innovt P JPY Acc	3.60M	1.66%	-42.33K
Nikko Gbl All Biological Genome Eq MF	2.02M	1.42%	-343.46K
Vanguard Institutional Extnd Mkt Idx Tr	2.00M	0.92%	-
Fidelity Small Cap Index	1.55M	0.72%	10.61K
iShares Russell 2000 Value ETF	1.46M	0.67%	7.87K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Apr 21, 2026	Keyes Jeffry R.	Chief Financial Officer	Sell	$37.19K
Apr 20, 2026	Keyes Jeffry R.	Chief Financial Officer	Sell	$37.62K
Apr 21, 2026	Hawkins Jeffrey Alan	President & CEO	Sell	$83.29K
Apr 20, 2026	Hawkins Jeffrey Alan	President & CEO	Sell	$84.25K
Mar 23, 2026	Keyes Jeffry R.	Chief Financial Officer	Sell	$3.66K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	4
2026 Q1	2	8
2025 Q4	-	5
2025 Q3	-	10
2025 Q2	-	4

QSI Ownership FAQ

Who Owns Quantum-Si?

Quantum-Si shareholders are primarily institutional investors at 32.10%, followed by 10.51% insiders and 57.39% retail investors. The average institutional ownership in Quantum-Si's industry, Biotech Stocks , is 35.75%, which Quantum-Si falls below.

Who owns the most shares of Quantum-Si?

Quantum-Si’s largest shareholders are Blackrock funding, inc. /de (13.41M shares, 6.78%), Blackrock (7M shares, 4.94%), and Vanguard group (9.61M shares, 4.60%). Together, they hold 16.32% 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?

Eversource wealth advisors is Quantum-Si’s biggest shareholder by percentage of total assets invested, with 0.74% of its assets in 627.08K Quantum-Si shares, valued at 24.37M$.

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 3.20% of its total shares outstanding invested in 6.93M Quantum-Si shares.

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