Quantum-Si Ownership | Who Owns Quantum-Si?

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Quantum-Si Ownership Summary

Quantum-Si is owned by 2.77% institutional investors, 13.97% insiders, and 83.26% retail investors. Ark investment management is the largest institutional shareholder, holding 6.21% of QSI shares. ARK Genomic Revolution is the top mutual fund, with 4.68% of its assets in Quantum-Si shares.

QSI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quantum-Si	2.77%	13.97%	83.26%
Sector	Healthcare Stocks	279.19%	10.62%	-189.81%
Industry	Biotech Stocks	63.96%	10.74%	25.30%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ark investment management	8.85M	6.21%	$23.89M
Blackrock funding, inc. /de	8.44M	5.93%	$22.78M
Blackrock	7.00M	4.94%	$7.35M
Sumitomo mitsui trust	5.97M	4.19%	$16.11B
Nikko asset management americas	5.97M	4.19%	$16.05M
Vanguard group	5.49M	3.86%	$14.83M
Millennium management	3.93M	2.75%	$4.72M
State street	2.37M	1.67%	$2.49M
Geode capital management	2.37M	1.66%	$6.40M
Susquehanna group, llp	1.00M	0.70%	$2.71M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Fosun	743.93K	0.63%	$2.01M
Green alpha advisors	158.86K	0.34%	$428.92K
Ark investment management	8.85M	0.20%	$23.89M
Nikko asset management americas	5.97M	0.17%	$16.05M
Shay capital	216.55K	0.09%	$584.67K
Knollwood investment advisory	300.00K	0.08%	$810.00K
Gsa capital partners llp	374.28K	0.07%	$1.01M
Xtx topco	245.59K	0.05%	$663.08K
Red wave investments	37.00K	0.03%	$99.90K
Dlk investment management	19.00K	0.02%	$51.30K

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	3.93M	0.00%	3.93M
Blackrock funding, inc. /de	8.44M	0.00%	1.54M
Susquehanna group, llp	1.00M	0.00%	958.84K
Goldman sachs group	1.00M	0.00%	759.99K
Ubs group	592.11K	0.00%	542.95K

Top Sellers

Holder	Shares	% Assets	Change
Ark investment management	8.85M	0.20%	-2.99M
Sumitomo mitsui trust	5.97M	0.01%	-1.58M
Nikko asset management americas	5.97M	0.17%	-1.56M
General american investors	-	-	-294.35K
Nuveen asset management	319.10K	0.00%	-245.98K

New Positions

Holder	Shares	% Assets	Change	Value
Manufacturers life insurance company, the	34.85K	0.00%	34.85K	$94.09K
Captrust financial advisors	34.58K	0.00%	34.58K	$41.50K
Thoroughbred financial services	33.00K	0.01%	33.00K	$89.00K
Mercer global advisors inc /adv	30.96K	0.00%	30.96K	$83.59K
Bnp paribas arbitrage, snc	19.02K	-	19.02K	$51.37K

Sold Out

Holder	Change
Rothschild investment	-75.00
Founders capital management	-100.00
Parkside financial bank & trust	-150.00
Eagle bay advisors	-277.00
Allspring global investments	-292.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Jun 30, 2024	101	3.06%	53,496,649	1.12%	37	2.70%	44	29.41%	30	-16.67%
Mar 31, 2024	98	5.38%	52,901,605	-6.36%	37	2.35%	34	-	36	33.33%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution	8.57M	4.68%	-152.82K
ARK Genomic Revolution ETF	7.95M	4.33%	-
Nikko AM ARK Pstv Chg Innovt P JPY Acc	4.58M	2.49%	-89.13K
iShares Russell 2000 ETF	3.05M	1.66%	1.50K
Vanguard Total Stock Mkt Idx Inv	3.02M	1.64%	-
Nikko Gbl All Biological Genome Eq MF	2.02M	1.42%	-343.46K
Vanguard Institutional Extnd Mkt Idx Tr	2.29M	1.25%	-
Fidelity Small Cap Index	1.20M	0.66%	178.06K
iShares Russell 2000 Value ETF	1.08M	0.59%	-
Fidelity Extended Market Index	763.51K	0.42%	193.32K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 21, 2025	Hawkins Jeffrey Alan	President & CEO	Sell	$32.85K
Mar 21, 2025	LaPointe Christian	General Counsel & Corp. Secr.	Sell	$6.78K
Mar 21, 2025	Keyes Jeffry R.	Chief Financial Officer	Sell	$11.95K
Mar 21, 2025	Vieceli John S.	Chief Product Officer	Sell	$5.98K
Dec 27, 2024	ROTHBERG JONATHAN M		Sell	$173.31K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	-
2025 Q1	-	4
2024 Q4	-	3
2024 Q3	5	2
2024 Q2	-	2

QSI Ownership FAQ

Who Owns Quantum-Si?

Quantum-Si shareholders are primarily institutional investors at 2.77%, followed by 13.97% insiders and 83.26% retail investors. The average institutional ownership in Quantum-Si's industry, Biotech Stocks , is 63.96%, which Quantum-Si falls below.

Who owns the most shares of Quantum-Si?

Quantum-Si’s largest shareholders are Ark investment management (8.85M shares, 6.21%), Blackrock funding, inc. /de (8.44M shares, 5.93%), and Blackrock (7M shares, 4.94%). Together, they hold 17.08% 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 0.63% of its assets in 743.94K Quantum-Si shares, valued at 2.01M$.

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 4.68% of its total shares outstanding invested in 8.57M Quantum-Si shares.

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