Quantum-Si (QSI) Stock Chart & Stock Price History $1.13 -0.03 (-2.59%) Closing price 04:00 PM EasternExtended Trading$1.11 -0.02 (-1.42%) As of 07:58 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Quantum-Si Stock Price Performance 5 Day Performance-14.57%1 Month Performance-21.38%3 Month Performance-74.71%6 Month Performance+23.30%Year-To-Date Performance-59.81%1 Year Performance-39.72% 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. Email Address QSI Stock Chart for Friday, April, 4, 2025 QSI Chart by TradingViewRemove Ads Quantum-Si Stock Price History Daily Weekly Monthly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year Time Frame * Start Date * End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization04/03/2025$1.23$1.16-5.69%$1.19$1.153.26 million shs$212.44 million04/02/2025$1.20$1.23+2.50%$1.25$1.162.88 million shs$225.26 million04/01/2025$1.20$1.20$1.22$1.153.25 million shs$219.77 million03/31/2025$1.27$1.20-5.51%$1.24$1.194.15 million shs$219.77 million03/28/2025$1.31$1.27-3.05%$1.33$1.253.16 million shs$232.59 million03/27/2025$1.39$1.31-5.76%$1.39$1.303.89 million shs$239.91 million03/26/2025$1.41$1.39-1.42%$1.46$1.364.01 million shs$254.57 million03/25/2025$1.48$1.41-4.73%$1.47$1.414.64 million shs$258.23 million03/24/2025$1.46$1.48+1.72%$1.54$1.437.17 million shs$271.05 million03/21/2025$1.41$1.46+3.19%$1.47$1.368.63 million shs$266.47 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. 03/20/2025$1.55$1.41-9.03%$1.51$1.398.46 million shs$258.23 million03/19/2025$1.59$1.55-2.52%$1.63$1.507.52 million shs$283.87 million03/18/2025$1.65$1.59-3.64%$1.72$1.4816.71 million shs$291.19 million03/17/2025$1.36$1.65+21.32%$1.76$1.5146.46 million shs$302.18 million03/14/2025$1.14$1.36+19.30%$1.37$1.1818.68 million shs$249.07 million03/13/2025$1.20$1.14-5.00%$1.20$1.123.52 million shs$208.78 million03/12/2025$1.18$1.20+1.69%$1.24$1.153.93 million shs$219.77 million03/11/2025$1.18$1.18+0.43%$1.21$1.124.04 million shs$216.11 million03/10/2025$1.29$1.18-8.91%$1.25$1.155.64 million shs$167.69 million03/07/2025$1.29$1.29+0.39%$1.30$1.223.04 million shs$184.10 million03/06/2025$1.40$1.29-8.21%$1.38$1.245.33 million shs$183.39 million03/05/2025$1.38$1.40+1.45%$1.41$1.323.68 million shs$199.80 million03/04/2025$1.30$1.38+6.15%$1.46$1.1510.55 million shs$196.94 million03/03/2025$1.38$1.30-5.80%$1.48$1.288.72 million shs$185.53 million Related Companies TRNS Stock Chart CTKB Stock Chart SENS Stock Chart LAB Stock Chart EYPT Stock Chart ALNT Stock Chart QTRX Stock Chart AEHR 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. 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