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    Quantum-Si Incorporated - Class A Common Stock (NQ:QSI)

    0.8360 +0.0190 (+2.33%)
    Streaming Delayed Price Updated: 3:54 PM EDT, Jul 21, 2026 Add to My Watchlist
    Quote
    Overview Detailed Quote Charting Historical Prices
    News
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    Research
    Quarterly Reports Insider Filings Other Filings

    Price and Volume

    Detailed Quote
    Volume 1,267,321
    Open 0.8216
    Bid (Size) 0.8359 (700)
    Ask (Size) 0.8376 (400)
    Prev. Close 0.8170
    Today's Range 0.8216 - 0.8498
    52wk Range 0.6912 - 3.100
    Shares Outstanding N/A
    Dividend Yield N/A
    Chart for (: )
    Intraday 1 Week 1 Month 3 Month 1 Year 3 Year 5 Year

    Top News

    More News
    News headline image
    Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si and Cell Signaling Technology Partner to Advance Post-Translational Modification Analysis on Proteus™
    From Quantum-Si Incorporated
    Via Business Wire

    Performance

    YTD
    -27.9%
    -27.9%
    1 Month
    -9.2%
    -9.2%
    3 Month
    -17.2%
    -17.2%
    6 Month
    -29.7%
    -29.7%
    1 Year
    -51.4%
    -51.4%

    More News

    Read More
    News headline image
    Quantum-Si Announces the Expansion of the Proteus™ Roadshow
    From Quantum-Si Incorporated
    Via Business Wire
    Quantum-Si (QSI) Reports Q1 2026 Revenue Miss but Beats EPS Amid Proteus Launch Preparations ↗
    Via Chartmill
    Quantum-Si (NASDAQ:QSI) Reports Q4 2025 Revenue Miss, Guides for Strategic Transition Year ↗
    Via Chartmill
    News headline image
    Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Q1 Earnings Call Highlights ↗
    Via MarketBeat
    Topics Earnings
    News headline image
    Quantum-Si (QSI) Q1 2026 Earnings Transcript ↗
    Via The Motley Fool
    News headline image
    Quantum-Si Reports First Quarter 2026 Financial Results and Highlights Proteus™ Development Milestones
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si to Participate in the H.C. Wainwright 4th Annual BioConnect Investor Conference at NASDAQ
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Successful Sequencing on Integrated Proteus™ Instruments
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Forget Neuralink: The Real Brain Tech Trade Has 10 Names You’ve Never Heard ↗
    Via InvestorPlace
    Topics Artificial Intelligence Economy Initial Public Offering
    News headline image
    Quantum-Si to Report First Quarter 2026 Financial Results on May 7, 2026
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Two Customer Posters to be Presented at the American Association of Cancer Research Annual Meeting
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces New Manuscript Demonstrating the Value of Single-molecule Protein Sequencing to Aid in Identifying New Cancer Treatment Strategies
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces First Customer Samples Tested on the Proteus™ Prototype System
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces the Start of the Proteus™ Roadshow
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si (QSI) Q4 2025 Earnings Call Transcript ↗
    Via The Motley Fool
    Topics Earnings
    News headline image
    Quantum-Si Reports Fourth Quarter and Full Year 2025 Financial Results
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si to Report Fourth Quarter and Full Year 2025 Financial Results on March 3, 2026
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces the Release of Two New Manuscripts Demonstrating the Value of Single-Molecule Protein Sequencing in Clinical Proteomics and Pathogen & Toxin Detection
    From Quantum-Si Incorporated
    Via Business Wire
    News headline image
    Quantum-Si Announces Launch of New Version 3 Library Preparation Kit and a Suite of Data Analysis Tool Enhancements
    From Quantum-Si Incorporated
    Via Business Wire

    Frequently Asked Questions

    Is Quantum-Si Incorporated - Class A Common Stock publicly traded?
    Yes, Quantum-Si Incorporated - Class A Common Stock is publicly traded.
    What exchange does Quantum-Si Incorporated - Class A Common Stock trade on?
    Quantum-Si Incorporated - Class A Common Stock trades on the Nasdaq Stock Market
    What is the ticker symbol for Quantum-Si Incorporated - Class A Common Stock?
    The ticker symbol for Quantum-Si Incorporated - Class A Common Stock is QSI on the Nasdaq Stock Market
    What is the current price of Quantum-Si Incorporated - Class A Common Stock?
    The current price of Quantum-Si Incorporated - Class A Common Stock is 0.8360
    When was Quantum-Si Incorporated - Class A Common Stock last traded?
    The last trade of Quantum-Si Incorporated - Class A Common Stock was at 07/21/26 03:54 PM ET
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