Quantum-Si Ownership | Who Owns Quantum-Si?

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Quantum-Si Ownership Summary

Quantum-Si is owned by 24.94% institutional investors, 11.62% insiders, and 63.45% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 6.17% of QSI shares. ARK Genomic Revolution is the top mutual fund, with 3.84% of its assets in Quantum-Si shares.

QSI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quantum-Si	24.94%	11.62%	63.45%
Sector	Healthcare Stocks	42.54%	10.83%	46.63%
Industry	Biotech Stocks	45.22%	10.75%	44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	11.32M	6.17%	$15.96M
Blackrock	7.00M	4.94%	$7.35M
Vanguard group	8.71M	4.75%	$12.29M
Ark investment management	7.62M	4.15%	$10.75B
Nikko asset management americas	5.22M	2.84%	$7.36M
Sumitomo mitsui trust	5.22M	2.84%	$7.36M
Millennium management	3.93M	2.75%	$4.72M
Geode capital management	3.75M	2.04%	$5.28M
State street	2.82M	1.53%	$3.97M
Northern trust	2.32M	1.27%	$3.28M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Fosun	743.93K	0.39%	$1.05M
Green alpha advisors	216.03K	0.29%	$304.61K
Elite life management	20.61K	0.11%	$54.21K
Nikko asset management americas	5.22M	0.07%	$7.36M
Ark investment management	7.62M	0.06%	$10.75B
Knollwood investment advisory	300.00K	0.04%	$423.00K
Verdence capital advisors	163.83K	0.02%	$383.36K
Shay capital	154.57K	0.02%	$217.95K
Iq eq fund management (ireland)	189.17K	0.02%	$266.74K
Red wave investments	37.00K	0.02%	$52.17K

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	3.93M	0.00%	3.93M
Jane street group	1.61M	0.00%	1.33M
Susquehanna group, llp	1.00M	0.00%	958.84K
Squarepoint ops	613.48K	0.00%	613.48K
Blackrock funding, inc. /de	11.32M	0.00%	473.53K

Top Sellers

Holder	Shares	% Assets	Change
Nuveen	447.52K	0.00%	-678.57K
Goldman sachs group	387.15K	0.00%	-506.95K
Sumitomo mitsui trust	5.22M	0.00%	-403.80K
Nikko asset management americas	5.22M	0.07%	-403.80K
Ark investment management	7.62M	0.06%	-336.69K

New Positions

Holder	Shares	% Assets	Change	Value
Squarepoint ops	613.48K	0.00%	613.48K	$865.00K
Imc-chicago	185.12K	0.00%	185.12K	$261.01K
Verdence capital advisors	163.83K	0.02%	163.83K	$383.36K
Engineers gate manager lp	41.45K	0.00%	41.45K	$58.45K
Hbk sorce advisory	21.43K	0.00%	21.43K	$37.93K

Sold Out

Holder	Change
True wealth design	-2.00
Rothschild investment	-75.00
American capital advisory	-100.00
Founders capital management	-100.00
Parkside financial bank & trust	-150.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2024	63	-42.73%	40,587,687	-21.92%	28	2.14%	37	-13.95%	8	-75.00%
Sep 30, 2024	110	8.91%	51,983,353	-2.83%	36	2.56%	43	-2.27%	32	6.67%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution	7.78M	3.84%	-794.51K
ARK Genomic Revolution ETF	7.77M	3.84%	-27.71K
Vanguard Total Stock Mkt Idx Inv	4.60M	2.27%	-101.41K
Nikko AM ARK Pstv Chg Innovt P JPY Acc	4.52M	2.24%	-60.89K
Amova ARK Pstv Chg Innovt P JPY Acc	4.52M	2.23%	-
iShares Russell 2000 ETF	3.40M	1.68%	-
Nikko Gbl All Biological Genome Eq MF	2.02M	1.42%	-343.46K
Vanguard Institutional Extnd Mkt Idx Tr	1.51M	0.74%	-673.51K
Fidelity Small Cap Index	1.42M	0.70%	190.63K
iShares Russell 2000 Value ETF	1.22M	0.60%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Oct 16, 2025	ROTHBERG JONATHAN M		Sell	$80.11K
Sep 22, 2025	LaPointe Christian	GC & Corp. Secretary	Sell	$9.03K
Sep 23, 2025	LaPointe Christian	GC & Corp. Secretary	Sell	$8.77K
Sep 22, 2025	Hawkins Jeffrey Alan	President & CEO	Sell	$17.91K
Sep 23, 2025	Hawkins Jeffrey Alan	President & CEO	Sell	$17.40K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	1
2025 Q3	-	10
2025 Q2	-	4
2025 Q1	-	4
2024 Q4	-	3

QSI Ownership FAQ

Who Owns Quantum-Si?

Quantum-Si shareholders are primarily institutional investors at 24.94%, followed by 11.62% insiders and 63.44% retail investors. The average institutional ownership in Quantum-Si's industry, Biotech Stocks , is 45.22%, which Quantum-Si falls below.

Who owns the most shares of Quantum-Si?

Quantum-Si’s largest shareholders are Blackrock funding, inc. /de (11.32M shares, 6.17%), Blackrock (7M shares, 4.94%), and Vanguard group (8.71M shares, 4.75%). Together, they hold 15.85% 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 0.39% of its assets in 743.94K Quantum-Si shares, valued at 1.05M$.

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

ARK Genomic Revolution is the top mutual fund holder of Quantum-Si shares, with 3.84% of its total shares outstanding invested in 7.78M Quantum-Si shares.

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