Quantum-Si (QSI) Stock Chart & Stock Price History $1.48 0.00 (0.00%) Closing price 05/16/2025 04:00 PM EasternExtended Trading$1.44 -0.04 (-2.70%) As of 05/16/2025 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 Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Quantum-Si Stock Price Performance The Quantum-Si (QSI) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 17.78%, with a year-to-date return of -45.19%. In the past month, the stock has increased 28.70%, reflecting recent market activity. As of the latest close, Quantum-Si traded at $1.48 with a market cap of $271.05 million and volume of 8.59 million shares. 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Email Address 5 Day Performance-2.63%1 Month Performance+28.70%3 Month Performance-22.51%Year-To-Date Performance-45.19%1 Year Performance-17.78% QSI Stock Chart for Monday, May, 19, 2025 QSI Chart by TradingView Quantum-Si Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame * Start Date * End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization05/16/2025$1.48$1.48$1.52$1.408.59 million shs$271.05 million05/15/2025$1.52$1.48-2.63%$1.55$1.458.69 million shs$271.05 million05/14/2025$1.46$1.52+4.11%$1.60$1.449.31 million shs$278.37 million05/13/2025$1.51$1.46-3.31%$1.59$1.437.00 million shs$267.38 million05/12/2025$1.26$1.51+19.84%$1.52$1.329.55 million shs$276.54 million05/09/2025$1.33$1.26-5.26%$1.34$1.243.62 million shs$230.76 million05/08/2025$1.20$1.33+10.83%$1.35$1.246.25 million shs$243.58 million05/07/2025$1.19$1.20+0.84%$1.22$1.162.31 million shs$219.77 million05/06/2025$1.20$1.19-0.83%$1.20$1.151.88 million shs$217.94 million05/05/2025$1.26$1.20-4.76%$1.25$1.172.98 million shs$219.77 million Get the Latest News and Ratings for QSI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Quantum-Si and its competitors with MarketBeat's FREE daily newsletter. 05/02/2025$1.16$1.26+8.62%$1.28$1.184.41 million shs$230.76 million05/01/2025$1.14$1.16+1.75%$1.17$1.122.09 million shs$212.44 million04/30/2025$1.18$1.14-3.39%$1.15$1.102.87 million shs$208.78 million04/29/2025$1.21$1.18-2.48%$1.23$1.182.56 million shs$216.11 million04/28/2025$1.23$1.21-1.63%$1.27$1.172.64 million shs$221.60 million04/25/2025$1.22$1.23+0.82%$1.25$1.193.20 million shs$225.26 million04/24/2025$1.17$1.22+4.27%$1.24$1.182.80 million shs$223.43 million04/23/2025$1.13$1.17+3.54%$1.24$1.153.39 million shs$214.27 million04/22/2025$1.09$1.13+3.67%$1.15$1.101.83 million shs$206.95 million04/21/2025$1.15$1.09-5.22%$1.13$1.081.71 million shs$199.62 million04/18/2025$1.15$1.15$1.18$1.121.63 million shs$210.61 million Related Companies TRNS Stock Chart ALNT Stock Chart LAB Stock Chart EYPT Stock Chart SENS Stock Chart CTKB Stock Chart AEHR Stock Chart QTRX Stock Chart MASS Stock Chart FEIM Stock Chart Receive QSI Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Quantum-Si and its competitors with MarketBeat's FREE daily newsletter. This page (NASDAQ:QSI) was last updated on 5/19/2025 by MarketBeat.com Staff From Our PartnersWhite House to reset Social Security?Elon Musk's parting DOGE gift looks set to shock America... 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