Quantum-Si Ownership | Who Owns Quantum-Si?

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Quantum-Si Ownership Summary

Quantum-Si is owned by 23.10% institutional investors, 11.62% insiders, and 65.28% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 6.24% of QSI shares. ARK Genomic Revolution ETF is the top mutual fund, with 3.22% of its assets in Quantum-Si shares.

QSI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quantum-Si	23.10%	11.62%	65.28%
Sector	Healthcare Stocks	232.01%	10.74%	-142.75%
Industry	Biotech Stocks	381.47%	10.55%	-292.02%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	13.05M	6.24%	$14.36M
Blackrock	7.00M	4.94%	$7.35M
Vanguard group	9.61M	4.60%	$10.57M
Ark investment management	7.02M	3.36%	$7.72M
Millennium management	3.93M	2.75%	$4.72M
Nikko asset management americas	4.69M	2.24%	$5.11M
Sumitomo mitsui trust	4.69M	2.24%	$5.16M
Geode capital management	4.11M	1.97%	$4.53M
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	0.19%	$818.33K
Caitong asset management	25.19K	0.08%	$27.71K
Nikko asset management americas	4.69M	0.06%	$5.11M
Green alpha advisors	51.53K	0.05%	$56.68K
Ark investment management	7.02M	0.05%	$7.72M
Knollwood investment advisory	300.00K	0.04%	$423.00K
Iq eq fund management (ireland)	253.90K	0.02%	$279.29K
Shay capital	154.57K	0.02%	$217.95K
Verdence capital advisors	187.81K	0.01%	$206.59K
Red wave investments	37.00K	0.01%	$40.70K

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	3.93M	0.00%	3.93M
Blackrock funding, inc. /de	13.05M	0.00%	1.73M
Susquehanna group, llp	1.00M	0.00%	958.84K
Ubs group	1.45M	0.00%	944.65K
Vanguard group	9.61M	0.00%	892.51K

Top Sellers

Holder	Shares	% Assets	Change
Squarepoint ops	-	-	-613.48K
Ark investment management	7.02M	0.05%	-602.47K
Nikko asset management americas	4.69M	0.06%	-526.78K
Sumitomo mitsui trust	4.69M	0.00%	-526.78K
Jane street group	1.10M	0.00%	-505.99K

New Positions

Holder	Shares	% Assets	Change	Value
Hrt financial lp	104.29K	0.00%	104.29K	$114.00K
Los angeles capital management	93.01K	0.00%	93.01K	$188.81K
Engineers gate manager lp	41.45K	0.00%	41.45K	$58.45K
China universal asset management	31.86K	0.00%	31.86K	$35.05K
Dimensional fund advisors lp	31.32K	-	31.32K	$34.45K

Sold Out

Holder	Change
True wealth design	-2.00
American capital advisory	-100.00
Founders capital management	-100.00
Srs capital advisors	-104.00
Parkside financial bank & trust	-150.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2024	63	-42.73%	40,587,687	-21.92%	28	2.14%	37	-13.95%	8	-75.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution ETF	6.93M	3.22%	-
ARK Genomic Revolution	6.74M	3.13%	-663.20K
Vanguard Total Stock Mkt Idx Inv	4.87M	2.26%	-
Nikko AM ARK Pstv Chg Innovt P JPY Acc	4.52M	2.24%	-60.89K
Amova ARK Pstv Chg Innovt P JPY Acc	3.88M	1.80%	-
iShares Russell 2000 ETF	3.82M	1.77%	1.96M
Nikko Gbl All Biological Genome Eq MF	2.02M	1.42%	-343.46K
Vanguard Institutional Extnd Mkt Idx Tr	2.00M	0.93%	-
Fidelity Small Cap Index	1.60M	0.74%	31.57K
iShares Russell 2000 Value ETF	1.33M	0.62%	427.82K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 05, 2026	Kummeth Charles R.	-	Buy	$459.80K
Mar 05, 2026	Dowdy Paula	-	Buy	$104.45K
Dec 22, 2025	Vieceli John S.	Chief Product Officer	Sell	$27.98K
Dec 22, 2025	LaPointe Christian	GC & Corp. Secretary	Sell	$15.25K
Dec 22, 2025	Keyes Jeffry R.	Chief Financial Officer	Sell	$11.01K

Insider Transactions Trends

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

QSI Ownership FAQ

Who Owns Quantum-Si?

Quantum-Si shareholders are primarily institutional investors at 23.10%, followed by 11.62% insiders and 65.28% retail investors. The average institutional ownership in Quantum-Si's industry, Biotech Stocks , is 381.47%, which Quantum-Si falls below.

Who owns the most shares of Quantum-Si?

Quantum-Si’s largest shareholders are Blackrock funding, inc. /de (13.05M shares, 6.24%), Blackrock (7M shares, 4.94%), and Vanguard group (9.61M shares, 4.60%). Together, they hold 15.78% 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 0.19% of its assets in 743.94K Quantum-Si shares, valued at 818.33K$.

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 3.22% of its total shares outstanding invested in 6.93M Quantum-Si shares.

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