Quantum-Si

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About QSI

Quantum-Si, Inc. is a life sciences company focused on revolutionizing the growing field of proteomics. It engages in the development of a proprietary universal single-molecule detection platform to enable Next-Generation Protein Sequencing (NGPS), the ability to sequence proteins in a massively parallel fashion. 

CEO
Jeffrey Alan Hawkins
CEOJeffrey Alan Hawkins
Employees
149
Employees149
Headquarters
Branford, Connecticut
HeadquartersBranford, Connecticut
Founded
2013
Founded2013
Employees
149
Employees149

QSI Key Statistics

Market cap
210.23M
Market cap210.23M
Price-Earnings ratio
-1.48
Price-Earnings ratio-1.48
Dividend yield
Dividend yield
Average volume
5.31M
Average volume5.31M
High today
$1.06
High today$1.06
Low today
$0.9601
Low today$0.9601
Open price
$1.05
Open price$1.05
Volume
5.89M
Volume5.89M
52 Week high
$3.10
52 Week high$3.10
52 Week low
$0.9248
52 Week low$0.9248

Stock Snapshot

With a market cap of 210.23M, Quantum-Si(QSI) trades at $0.99. The stock has a price-to-earnings ratio of -1.48.

During the trading session on 2026-02-12, Quantum-Si(QSI) shares reached a daily high of $1.06 and a low of $0.96. At a current price of $0.99, the stock is +2.8% higher than the low and still -6.9% under the high.

Trading activity shows a volume of 5.89M, compared to an average daily volume of 5.31M.

Over the past 52 weeks, Quantum-Si(QSI) stock has traded between a high of $3.10 and a low of $0.92.

Over the past 52 weeks, Quantum-Si(QSI) stock has traded between a high of $3.10 and a low of $0.92.

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