Quantum-Si (QSI) Stock Chart & Stock Price History $1.17 +0.03 (+2.63%) Closing price 04:00 PM EasternExtended Trading$1.16 0.00 (-0.43%) 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 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 increased 23.16%, with a year-to-date return of -56.67%. In the past month, the stock has decreased 39.38%, reflecting recent market activity. As of the latest close, Quantum-Si traded at $1.14 with a market cap of $230.84 million and volume of 3.86 million shares. 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Read our full terms of service and privacy policy. 5 Day Performance+5.41%1 Month Performance-39.38%3 Month Performance-39.69%Year-To-Date Performance-56.67%1 Year Performance+23.16% QSI Stock Chart for Tuesday, August, 26, 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 Capitalization08/26/2025$1.14$1.17+2.63%$1.18$1.113.53 million shs$236.92 million08/25/2025$1.14$1.14$1.17$1.113.86 million shs$230.84 million08/22/2025$1.11$1.14+2.70%$1.16$1.066.75 million shs$230.84 million08/21/2025$1.00$1.11+11.00%$1.14$0.989.23 million shs$224.76 million08/20/2025$1.03$1.00-2.91%$1.02$0.9511.00 million shs$202.50 million08/19/2025$1.09$1.03-5.50%$1.14$1.027.89 million shs$208.57 million08/18/2025$1.10$1.09-0.91%$1.12$1.094.91 million shs$220.71 million08/15/2025$1.12$1.10-1.79%$1.14$1.095.76 million shs$201.85 million08/14/2025$1.17$1.12-4.27%$1.19$1.089.73 million shs$205.52 million08/13/2025$1.16$1.17+0.86%$1.21$1.147.85 million shs$214.70 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. 08/12/2025$1.20$1.16-3.33%$1.22$1.149.81 million shs$212.86 million08/11/2025$1.27$1.20-5.51%$1.28$1.188.50 million shs$220.20 million08/08/2025$1.33$1.27-4.51%$1.35$1.266.42 million shs$233.04 million08/07/2025$1.37$1.33-2.92%$1.38$1.314.15 million shs$244.06 million08/06/2025$1.44$1.37-4.86%$1.39$1.278.45 million shs$251.40 million08/05/2025$1.44$1.44$1.48$1.407.62 million shs$264.24 million08/04/2025$1.46$1.44-1.37%$1.49$1.434.30 million shs$267.91 million08/01/2025$1.48$1.46-1.35%$1.49$1.404.41 million shs$267.91 million07/31/2025$1.62$1.48-8.64%$1.62$1.4711.08 million shs$271.58 million07/30/2025$1.64$1.62-0.92%$1.70$1.614.36 million shs$297.27 million07/29/2025$1.79$1.64-8.66%$1.80$1.609.33 million shs$300.02 million07/28/2025$1.93$1.79-7.25%$1.95$1.766.72 million shs$328.47 million07/25/2025$1.98$1.93-2.53%$1.98$1.857.40 million shs$354.16 million Related Companies EYPT Stock Chart TRNS Stock Chart ALNT Stock Chart AEHR Stock Chart CTKB Stock Chart LAB Stock Chart SENS Stock Chart FEIM Stock Chart QTRX Stock Chart MASS 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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