Quantum-Si
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Robinhood gives you the tools you need to put your money in motion. You can buy or sell Quantum-Si and other ETFs, options, and stocks.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.
CEOJeffrey Alan Hawkins
CEOJeffrey Alan Hawkins
Employees149
Employees149
HeadquartersBranford, Connecticut
HeadquartersBranford, Connecticut
Founded2013
Founded2013
Employees149
Employees149
QSI Key Statistics
Market cap274.75M
Market cap274.75M
Price-Earnings ratio-1.93
Price-Earnings ratio-1.93
Dividend yield—
Dividend yield—
Average volume5.75M
Average volume5.75M
High today$1.28
High today$1.28
Low today$1.19
Low today$1.19
Open price$1.23
Open price$1.23
Volume5.22M
Volume5.22M
52 Week high$5.77
52 Week high$5.77
52 Week low$0.9499
52 Week low$0.9499
Stock Snapshot
With a market cap of 274.75M, Quantum-Si(QSI) trades at $1.28. The stock has a price-to-earnings ratio of -1.93.
On 2025-11-23, Quantum-Si(QSI) stock moved within a range of $1.19 to $1.28. With shares now at $1.28, the stock is trading +7.5% above its intraday low and -0.0% below the session's peak.
Trading volume for Quantum-Si(QSI) stock has reached 5.22M, versus its average volume of 5.75M.
Over the past 52 weeks, Quantum-Si(QSI) stock has traded between a high of $5.77 and a low of $0.95.
Over the past 52 weeks, Quantum-Si(QSI) stock has traded between a high of $5.77 and a low of $0.95.
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