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Quantum-Si Incorporated

QSI

Market cap $313M

1.43 USD

-0.10

6.54%

At close Updated Oct 12, 11:05 AM EDT

1 day

-6.54%

5 days

10.85%

1 month

97.24%

3 months

64.5%

6 months

81.31%

Year to date

23.28%

1 year

-31.25%

5 years

-83.27%

10 years

-85.53%

About: Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis. Its technology supports massively parallel sequencing of proteins and can also be applied to the study of nucleic acids, providing tools for researchers and clinical applications in molecular analysis. The company's revenue is derived from sales of products and services.

Employees: 145

Healthcare Medical Devices

News

Positive

Neutral

Negative

Sentiment 3-Months

Positive 0%

Neutral 78.6%

Negative 21.4%

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Leading Indicators For The October Breakout Cycle

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Quantum-Si Demonstrates Detection of 19 Amino Acids in Proteus™ Development Program

BRANFORD, Conn., Oct. 08, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI” or the “Company”), a proteomics company redefining protein analysis through single-molecule protein sequencing, today announced that it has demonstrated detection of 19 amino acids in its Proteus™ development program and is now working to deploy that capability into a developmental sequencing kit for routine use on integrated Proteus instruments.

Quantum-Si Demonstrates Detection of 19 Amino Acids in Proteus™ Development Program

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Top 3 Health Care Stocks That May Collapse In Q4

Schaeffers Research

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Nektar Therapeutics (NASDAQ:NKTR), Quantum-Si Inc (NASDAQ:QSI), and Pacific Biosciences of California Inc (NASDAQ:PACB) are all attracting elevated options activity today, as biotech stocks make volatile moves.

3 Biotech Stocks Put Traders Are Targeting Today

Quantum-Si Presents Interim Proteus™ Data at World HUPO 2026 Demonstrating a Significant Step Change in Performance Compared to Platinum® Pro

BRANFORD, Conn., Sept. 28, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI” or the “Company”), a proteomics company redefining protein analysis through single-molecule protein sequencing, today announced interim development results comparing its next-generation Proteus™ platform with its commercially available Platinum® Pro instrument.

Quantum-Si Presents Interim Proteus™ Data at World HUPO 2026 Demonstrating a Significant Step Change in Performance Compared to Platinum® Pro

Quantum-Si Announces Detection of 18 Amino Acids Using a Developmental Sequencing Kit on Proteus™

BRANFORD, Conn., Sept. 15, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI” or the “Company”), a proteomics company redefining protein analysis through single-molecule protein sequencing, today announced that it has demonstrated sequencing with detection of 18 amino acids using a developmental kit run on integrated Proteus™ instruments.

Quantum-Si Announces Detection of 18 Amino Acids Using a Developmental Sequencing Kit on Proteus™

Quantum-Si Expands Proteus™ Roadshow with Additional U.S. and European Cities

BRANFORD, Conn., Sept. 09, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) (“Quantum-Si,” “QSI” or the “Company”), a proteomics technology company redefining protein analysis through single-molecule protein sequencing, today announced the expansion of a roadshow designed to accelerate market education on its Proteus platform and applications for protein sequencing.

Quantum-Si Expands Proteus™ Roadshow with Additional U.S. and European Cities

Quantum-Si to Participate in the H.C. Wainwright 28th Annual Global Investment Conference

BRANFORD, Conn., Aug. 18, 2026 (GLOBE NEWSWIRE) -- Quantum-Si Incorporated (Nasdaq: QSI) ("Quantum-Si," "QSI" or the "Company"), a proteomics technology company redefining protein analysis through single-molecule protein sequencing, today announced that it will be participating in the H.C.

Quantum-Si to Participate in the H.C. Wainwright 28th Annual Global Investment Conference

Quantum-Si incorporated (QSI) Q2 2026 Earnings Call Transcript

Quantum-Si incorporated (QSI) Q2 2026 Earnings Call Transcript

Quantum-Si incorporated (QSI) Q2 2026 Earnings Call Transcript

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