Compare Stocks Compare stocks with our powerful stock comparison tool. Analyze fundamentals, price performance, and key financial indicators to make informed investment decisions. Our tool lets you compare up to ten stocks side by side based on Performance Charts, Price & Volume, MarketRank™, Analyst Ratings, Sales & Book Value, Profitability & Earnings, Dividends, Debt, Ownership, Headlines, and more. Simply enter up to ten stock symbols (e.g., BAC, JPM, WFC, C, GS) to get started and uncover top investment opportunities. Stocks to Compare Sections All Sections Selected Performance Chart Price & Volume MarketRank Analyst Ratings Sales & Book Value Profitability & Earnings Dividends Debt Ownership Miscellaneous Headlines About Compare NASDAQ:QSI On This Page Performance ChartPrice & VolumeMarketRank™Analyst RatingsSales & Book ValueProfitability & EarningsDividendsDebtOwnershipMiscellaneousHeadlinesAbout Comparison Ideas Stock Ideas Comparative Price Performance Over Time1 day7 days30 days90 days365 daysCompare Price & VolumeCompanyCurrent Price50-Day Moving Average52-Week RangeMarket CapBetaAvg. VolumeToday's VolumeQSIQuantum-Si$1.19-0.8%$0.91$0.69▼$3.10$261.31M3.156.12 million shs7.27 million shsTen Starter Stocks For Beginners to Buy NowJust getting into the stock market? These 10 simple stocks can help beginning investors build long-term wealth without knowing options, technicals, or other advanced strategies.Get This Free ReportCompare Price PerformanceCompany1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year PerformanceQSIQuantum-Si+6.19%+21.21%+31.58%+25.47%-32.58%Compare Price & VolumeCompanyCurrent Price50-Day Moving Average52-Week RangeMarket CapBetaAvg. VolumeToday's VolumeQSIQuantum-Si$1.19-0.8%$0.91$0.69▼$3.10$261.31M3.156.12 million shs7.27 million shsTen Starter Stocks For Beginners to Buy NowJust getting into the stock market? These 10 simple stocks can help beginning investors build long-term wealth without knowing options, technicals, or other advanced strategies.Get This Free ReportCompare Price PerformanceCompany1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year PerformanceQSIQuantum-Si+6.19%+21.21%+31.58%+25.47%-32.58%Compare Analyst ForecastsCompanyConsensus Rating ScoreConsensus RatingConsensus Price Target% Upside from Current PriceQSIQuantum-Si 1.50Reduce$1.00-15.97% DownsideCurrent Analyst Ratings BreakdownLatest QSI Analyst RatingsDateCompanyBrokerageActionRatingPrice TargetDetails3/27/2026QSIQuantum-Si Weiss RatingsSubscribe to MarketBeat All Access for the firm's recommendation accuracy ratingReiterated RatingSell (D-)3/4/2026QSIQuantum-Si Canaccord Genuity GroupSubscribe to MarketBeat All Access for the firm's recommendation accuracy ratingLower Price TargetHold$1.50 ➝ $1.00(Data available from 5/29/2023 forward. View 10+ years of historical ratings with our analyst ratings screener.)Compare Sales & Book ValueCompanyAnnual RevenuePrice/SalesCashflowPrice/CashBook ValuePrice/BookQSIQuantum-Si$2.44M106.20N/AN/A$0.92 per share1.29Compare Profitability & EarningsCompanyNet IncomeEPSTrailing P/E RatioForward P/E RatioP/E GrowthNet MarginsReturn on Equity (ROE)Return on Assets (ROA)Next Earnings DateQSIQuantum-Si-$101.34M-$0.51N/AN/AN/A-5,605.88%-47.35%-42.66%8/4/2026 (Estimated)Latest QSI EarningsDateQuarterCompanyConsensus EstimateReported EPSBeat/MissGap EPSRevenue EstimateActual RevenueDetails5/7/2026Q1 2026QSIQuantum-Si-$0.12-$0.10+$0.02-$0.10$0.30 million$0.26 million3/3/2026Q4 2025QSIQuantum-Si-$0.14-$0.08+$0.06-$0.08$0.76 million$0.45 millionCompare DividendsCompanyAnnual PayoutDividend Yield5-Year Annualized Dividend GrowthPayout RatioYears of Consecutive GrowthQSIQuantum-SiN/AN/AN/AN/AN/ACompare DebtCompanyDebt-to-Equity RatioCurrent RatioQuick RatioQSIQuantum-SiN/A12.6012.40Compare OwnershipInstitutional OwnershipCompanyInstitutional OwnershipQSIQuantum-Si39.90%Insider OwnershipCompanyInsider OwnershipQSIQuantum-Si22.04%Compare Miscellaneous StatsCompanyEmployeesShares OutstandingFree FloatOptionableQSIQuantum-Si150217.76 million169.77 millionOptionableQSI HeadlinesRecent News About These CompaniesQuantum-Si incorporated (QSI) Shareholder/Analyst Call Prepared Remarks TranscriptMay 15, 2026 | seekingalpha.comAlliance Global Partners Sticks to Its Buy Rating for Quantum-Si (QSI)May 14, 2026 | theglobeandmail.comQuantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)May 13, 2026 | businesswire.comQuantum-Si Earnings Call: Proteus Progress, Profits PendingMay 8, 2026 | tipranks.comQuantum-Si (NASDAQ:QSI) Issues Earnings ResultsMay 8, 2026 | marketbeat.comQuantum-Si Q1 Earnings Call HighlightsMay 8, 2026 | marketbeat.comQuantum-Si Incorporated (QSI) Reports Q1 Loss, Misses Revenue EstimatesMay 7, 2026 | zacks.comQuantum-Si Reports First Quarter 2026 Financial Results and Highlights Proteus™ Development MilestonesMay 7, 2026 | businesswire.comEarnings To Watch: Quantum-Si Inc (QSI) Reports Q1 2026 ResultMay 6, 2026 | finance.yahoo.comQuantum-Si to Participate in the H.C. Wainwright 4th Annual BioConnect Investor Conference at NASDAQMay 1, 2026 | tmcnet.comQuantum-Si Announces Successful Sequencing on Integrated Proteus™ InstrumentsApril 30, 2026 | tmcnet.comQuantum-Si (QSI) Projected to Post Quarterly Earnings on ThursdayApril 30, 2026 | marketbeat.comJeffry Keyes Sells 37,381 Shares of Quantum-Si (NASDAQ:QSI) StockApril 23, 2026 | insidertrades.comQuantum-Si to Report First Quarter 2026 Financial Results on May 7, 2026April 16, 2026 | businesswire.comQuantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)April 10, 2026 | businesswire.comQuantum-Si Announces the Start of the Proteus™ RoadshowApril 6, 2026 | businesswire.comQuantum-Si Incorporated Class AMarch 31, 2026 | edition.cnn.comInsider Selling: Quantum-Si (NASDAQ:QSI) CEO Sells 12,149 Shares of StockMarch 26, 2026 | insidertrades.comQuantum-Si Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)March 13, 2026 | businesswire.comQuantum-Si (NASDAQ:QSI) Director Paula Dowdy Acquires 109,890 Shares of StockMarch 10, 2026 | insidertrades.comQuantum-Si outlines $1M 2026 revenue target and $425,000 Proteus list price as company prepares for major platform transitionMarch 4, 2026 | seekingalpha.comNew MarketBeat Followers Over TimeMedia Sentiment Over TimeQSI Company DescriptionsQuantum-Si NASDAQ:QSI$1.19 -0.01 (-0.83%) Closing price 04:00 PM EasternExtended Trading$1.18 -0.01 (-1.18%) As of 07:59 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.Quantum-Si incorporated, a life sciences company, engages in the development of single-molecule detection platform to enable Next Generation Protein Sequencing (NGPS). The company's platform is comprised of the Platinum NGPS instrument; the Platinum Analysis Software service; and reagent kits and semiconductor chips for use with its instruments. It is used in protein identification, protein variants, antibody characterization, biomarker identification, and post translational modification analysis applications. The company was founded in 2013 is headquartered in Branford, Connecticut. 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