NASDAQ:QSIAW Quantum-Si (QSIAW) Stock Price, News & Analysis $0.03 +0.00 (+17.72%) Closing price 05/19/2026 03:51 PM EasternExtended Trading$0.03 +0.00 (+1.34%) As of 05/19/2026 04:09 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more. Add Compare Share Share Stock Analysis Stock AnalysisChartCompetitorsSEC FilingsShort InterestTrendsBuy This Stock About Quantum-Si Stock (NASDAQ:QSIAW) View Price History Chart DataSkip Price History Chart 1 Day 5 Days 30 Days 90 Days 1 Year Advanced 1 Day 1 Day 5 Days 30 Days 90 Days 1 Year Advanced Show volume Show extended hours Get Quantum-Si alerts:Sign Up Key Stats Today's Range$0.02▼$0.0350-Day Range$0.03▼$0.1952-Week Range$0.02▼$1.08Volume16,326 shsAverage Volume12,997 shsMarket CapitalizationN/AP/E RatioN/ADividend YieldN/APrice TargetN/AConsensus RatingN/A Company Overview Quantum-Si, Inc. (NASDAQ: QSIAW) is a life sciences company focused on developing a next-generation protein sequencing platform. The company aims to unlock the proteome by enabling single-molecule protein analysis, a capability that promises to advance drug discovery, diagnostic development and molecular biology research. Quantum-Si’s core technology leverages proprietary semiconductor-based nanopore arrays and optical detection to directly sequence proteins and quantify expression patterns with high sensitivity. Headquartered in Pleasanton, California, Quantum-Si was founded to address limitations in existing proteomics methods, such as mass spectrometry, which can be time-consuming and less sensitive to low-abundance proteins. The company’s flagship product, the Q-EPIC System, integrates sample preparation reagents, fluidics cartridges and bioinformatics software to deliver end-to-end protein sequencing workflows. By providing single-molecule resolution, Quantum-Si’s platform offers researchers more comprehensive insights into post-translational modifications and protein biomarkers. Quantum-Si serves a broad customer base that includes pharmaceutical and biotechnology companies, academic institutions and diagnostic developers across North America, Europe and Asia. The company has established collaborations with leading research organizations to validate its sequencing technology in therapeutic areas such as oncology, neurology and immunology. Quantum-Si’s leadership team combines expertise in genomics, semiconductor engineering and life sciences commercialization to accelerate the adoption of its protein sequencing solutions.AI Generated. May Contain Errors. Read More Receive QSIAW Stock News and Ratings via Email Sign-up to receive the latest news and ratings for Quantum-Si and its competitors with MarketBeat's FREE daily newsletter. 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QSIAW Stock News HeadlinesQuantum-Si outlines 2026 revenue of approximately $1M with Proteus launch targeted by end of 2026May 8, 2026 | seekingalpha.comQuantum-Si Announces Two Customer Posters to be Presented at the American Association of Cancer Research Annual MeetingApril 15, 2026 | finance.yahoo.comThe chokepoint supplier behind SpaceX's $1.75 trillion empireWhen Musk laughed and said 'you need transformers to run transformers,' it wasn't a joke - it was a confession. The world's largest supercomputer requires power equipment that takes 120 weeks to build, and Musk built Colossus in just 122 days. One small American company is positioned to close that gap faster than anyone else, yet Wall Street still prices it like an afterthought. Dylan Jovine has the full story and the ticker.May 20 at 1:00 AM | Behind the Markets (Ad)Quantum-Si Announces New Manuscript Demonstrating the Value of Single-molecule Protein Sequencing to Aid in Identifying New Cancer Treatment StrategiesApril 14, 2026 | finance.yahoo.comQuantum-Si Announces First Customer Samples Tested on the Proteus™ Prototype SystemApril 8, 2026 | finance.yahoo.comQuantum-Si incorporated's (NASDAQ:QSI) 21% loss last week hit both individual investors who own 49% as well as institutionsNovember 10, 2025 | finance.yahoo.comQuantum-Si outlines continued placement-driven growth and Proteus launch milestones as market pressures persistNovember 6, 2025 | msn.comEarnings To Watch: Quantum-Si Inc (QSI) Reports Q3 2025 ResultNovember 4, 2025 | finance.yahoo.comSee More Headlines QSIAW Stock Analysis - Frequently Asked Questions How have QSIAW shares performed this year? Quantum-Si's stock was trading at $0.2005 on January 1st, 2026. Since then, QSIAW stock has decreased by 85.1% and is now trading at $0.0299. How do I buy shares of Quantum-Si? Shares of QSIAW stock can be purchased through any online brokerage account. Popular online brokerages with access to the U.S. stock market include Charles Schwab, E*TRADE, Fidelity, and Vanguard Brokerage Services. Health Indicator TradeSmith's Health IndicatorA long-term volatility-based measure designed for securities held 12 months or longer.Green: Strong and healthy uptrend with normal pullbacks.Yellow: Significant pullback but still within expected volatility.Red: Dropped beyond expected volatility; considered unhealthy. Red Zone (3m+) 1-Year History May 25 Aug 25 Nov 25 Feb 26 May 26 QSIAW's financial health is in the Red zone, according to TradeSmith. QSIAW has been in this zone for over 3 months. Industry, Sector and Symbol Stock ExchangeNASDAQ SectorMedical Industry Medical Devices Sub-IndustryMeasuring And Control Equipment Current SymbolNASDAQ:QSIAW CIK1833769 Webwww.quantum-si.com Phone866-688-7374FaxN/AEmployees150Year FoundedN/AProfitability EPS (Trailing Twelve Months)N/A Trailing P/E RatioN/A Forward P/E RatioN/A P/E GrowthN/ANet IncomeN/A Net MarginsN/A Pretax MarginN/A Return on EquityN/A Return on AssetsN/A Debt Debt-to-Equity RatioN/A Current RatioN/A Quick RatioN/A Sales & Book Value Annual Sales$1.85 million Price / SalesN/A Cash FlowN/A Price / Cash FlowN/A Book ValueN/A Price / BookN/AMiscellaneous Outstanding SharesN/AFree FloatN/AMarket CapN/A OptionableNot Optionable BetaN/A 7 Stocks to Ride The A.I. MegaboomWe are about to experience the greatest A.I. boom in stock market history... Thanks to a pivotal economic catalyst, specific tech stocks will skyrocket just like they did during the "dot com" boom in the 1990s. 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