Quantum Si Inc QSI

Institutional shares held 60.8 Million

1.69M calls

931K puts

Total value of holdings $86.4M

$2.4M calls

$1.32M puts

Market Cap $170M

119,433,000 Shares Out.

Institutional ownership 50.94%

# of Institutions 144

We take great care to ensure that the data presented and summarized in this overview for Quantum-Si Inc is accurate and up-to-date, based on a comprehensive analysis of 13F filing forms for institutional ownership and form 4 filings for insider transactions. Please note that this data may differ from other sources and should not be relied upon as the sole basis for investment decisions.

Quarterly Institutional Activity in QSI

Shares Bought

Shares Sold

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Top Institutions Holding QSI

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Latest Institutional Activity in QSI

Top Purchases

Q3 2025

Jane Street Group, LLC Shares Held: 1.61M ($2.29M)

1.33M Shares purchased

465.41% Added

Q3 2025

Susquehanna International Group, LLP Shares Held: 2.04M ($2.9M)

1.06M Shares purchased

106.99% Added

Q3 2025

Squarepoint Ops LLC Shares Held: 613K ($871K)

613K Shares purchased

New Holding

Q3 2025

Geode Capital Management, LLC Shares Held: 3.75M ($5.32M)

299K Shares purchased

8.68% Added

Q3 2025

Group One Trading, L.P. Shares Held: 378K ($536K)

243K Shares purchased

180.6% Added

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Top Sells

Q3 2025

Millennium Management LLC Shares Held: 2.67M ($3.79M)

1.11M Shares sold

29.35% Reduced

Q3 2025

Nuveen, LLC Shares Held: 448K ($635K)

679K Shares sold

60.26% Reduced

Q3 2025

Goldman Sachs Group Inc Shares Held: 387K ($550K)

507K Shares sold

56.7% Reduced

Q3 2025

Nikko Asset Management Americas, Inc. Shares Held: 5.22M ($7.41M)

404K Shares sold

7.18% Reduced

Q3 2025

Sumitomo Mitsui Trust Holdings, Inc. Shares Held: 5.22M ($7.41M)

404K Shares sold

7.18% Reduced

View All Sellers

About QSI

Quantum-Si incorporated, a life sciences company, develops a single molecule detection platform for sample preparation and sequencing. It offers a proprietary single molecule detection platform for use in semiconductor industry to field proteomics to enable next generation protein sequencing. The company was incorporated in 2013 is based in Guilford, Connecticut.

Insider Transactions at QSI

Insider Transaction List

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Date	Insider	Transaction	Ownership Type	Shares Traded	Value / Price
Oct 16 2025	Jonathan M Rothberg	SELL Open market or private sale	Indirect	26,095 -1.35%	$78,285 $3.07 P/Share
Sep 23 2025	Todd C. Bennett Chief Commercial Officer	SELL Open market or private sale	Direct	18,482 -2.64%	$18,482 $1.64 P/Share
Sep 23 2025	Jeffry R. Keyes Chief Financial Officer	SELL Open market or private sale	Direct	3,873 -0.33%	$3,873 $1.64 P/Share

Sep 23 2025	John S. Vieceli Chief Product Officer	SELL Open market or private sale	Direct	9,843 -1.18%	$9,843 $1.64 P/Share
Sep 23 2025	Jeffrey Alan Hawkins President & CEO	SELL Open market or private sale	Direct	10,643 -0.41%	$10,643 $1.64 P/Share
Sep 23 2025	Christian La Pointe GC & Corp. Secretary	SELL Open market or private sale	Direct	5,364 -0.56%	$5,364 $1.64 P/Share
Sep 22 2025	Todd C. Bennett Chief Commercial Officer	SELL Open market or private sale	Direct	18,482 -2.57%	$18,482 $1.68 P/Share
Sep 22 2025	Jeffry R. Keyes Chief Financial Officer	SELL Open market or private sale	Direct	3,873 -0.33%	$3,873 $1.68 P/Share
Sep 22 2025	John S. Vieceli Chief Product Officer	SELL Open market or private sale	Direct	9,843 -1.17%	$9,843 $1.68 P/Share
Sep 22 2025	Jeffrey Alan Hawkins President & CEO	SELL Open market or private sale	Direct	10,643 -0.41%	$10,643 $1.68 P/Share
Sep 22 2025	Christian La Pointe GC & Corp. Secretary	SELL Open market or private sale	Direct	5,364 -0.55%	$5,364 $1.68 P/Share
Jun 23 2025	John S. Vieceli Chief Product Officer	SELL Open market or private sale	Direct	21,923 -2.54%	$21,923 $1.61 P/Share
Jun 23 2025	Jeffrey Alan Hawkins President & CEO	SELL Open market or private sale	Direct	23,705 -0.9%	$23,705 $1.61 P/Share
Jun 23 2025	Christian La Pointe GC & Corp. Secretary	SELL Open market or private sale	Direct	11,946 -1.21%	$11,946 $1.61 P/Share
Jun 23 2025	Jeffry R. Keyes Chief Financial Officer	SELL Open market or private sale	Direct	8,624 -0.73%	$8,624 $1.61 P/Share
Mar 21 2025	Jeffrey Alan Hawkins President & CEO	SELL Open market or private sale	Direct	23,707 -0.89%	$23,707 $1.39 P/Share
Mar 21 2025	Christian La Pointe GC & Corp. Secretary	SELL Open market or private sale	Direct	4,896 -0.5%	$4,896 $1.39 P/Share
Mar 21 2025	Jeffry R. Keyes Chief Financial Officer	SELL Open market or private sale	Direct	8,626 -0.72%	$8,626 $1.39 P/Share

Mar 21 2025	John S. Vieceli Chief Product Officer	SELL Open market or private sale	Direct	4,317 -0.5%	$4,317 $1.39 P/Share
Mar 12 2025	Jeffrey Alan Hawkins President & CEO	BUY Grant, award, or other acquisition	Direct	1,666,666 +38.43%	-

View All Transactions

Last 12 Months Summary

Buy / Acquisition

3.75M Shares

From 5 Insiders

Grant, award, or other acquisition	3.75M shares

Sell / Disposition

3.74M Shares

From 6 Insiders

Open market or private sale	3.74M shares

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Quantum Si Inc QSI

Quarterly Institutional Activity in QSI

Top Institutions Holding QSI

Latest Institutional Activity in QSI

Top Purchases

Top Sells

About QSI

Insider Transactions at QSI

Insider Transaction List

Last 12 Months Summary

Track Institutional and Insider Activities on QSI

Institutional Portfolio Updates

Insider Trading

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