Quantum-Si (QSIAW) Stock Chart & Stock Price History $0.40 -0.01 (-2.41%) Closing price 03:51 PM EasternExtended Trading$0.40 +0.00 (+0.97%) As of 04:13 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 AnalysisChartCompetitorsSEC FilingsShort InterestTrendsBuy This Stock Quantum-Si Stock Price Performance The Quantum-Si (QSIAW) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 300.50%, with a year-to-date return of -67.99%. In the past month, the stock has decreased 13.02%, reflecting recent market activity. As of the latest close, Quantum-Si traded at $0.41 with a market cap of and volume of 4,704 shares. 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Read our full terms of service and privacy policy. 5 Day Performance-12.45%1 Month Performance-13.02%3 Month Performance-50.30%Year-To-Date Performance-67.99%1 Year Performance+300.50% QSIAW Stock Chart for Thursday, September, 4, 2025 QSIAW 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 Capitalization09/04/2025$0.41$0.40-2.41%$0.40$0.401,153 shs$0.0009/03/2025$0.43$0.41-4.65%$0.50$0.354,704 shs$0.0009/02/2025$0.46$0.43-5.91%$0.53$0.462,530 shs$0.0009/01/2025$0.46$0.46$0.42$0.42504 shs$0.0008/29/2025$0.45$0.46+1.56%$0.42$0.42504 shs$0.0008/28/2025$0.41$0.45+9.22%$0.50$0.403,816 shs$0.0008/27/2025$0.45$0.41-8.44%$0.49$0.441,426 shs$0.0008/26/2025$0.45$0.45-0.66%$0.48$0.4013,747 shs$0.0008/25/2025$0.49$0.45-8.13%$0.50$0.416,606 shs$0.0008/22/2025$0.42$0.49+17.13%$0.55$0.4115,552 shs$0.00 Get the Latest News and Ratings for QSIAW 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. 08/21/2025$0.40$0.42+5.25%$0.49$0.399,591 shs$0.0008/20/2025$0.39$0.40+2.56%$0.40$0.336,202 shs$0.0008/19/2025$0.41$0.39-4.90%$0.48$0.3988,695 shs$0.0008/18/2025$0.35$0.41+18.18%$0.44$0.3629,081 shs$0.0008/15/2025$0.34$0.35+2.06%$0.36$0.3014,180 shs$0.0008/14/2025$0.33$0.34+3.50%$0.37$0.3111,892 shs$0.0008/13/2025$0.37$0.33-12.02%$0.37$0.3035,680 shs$0.0008/12/2025$0.39$0.37-4.26%$0.44$0.3137,918 shs$0.0008/11/2025$0.40$0.39-2.01%$0.42$0.398,163 shs$0.0008/08/2025$0.43$0.40-6.79%$0.45$0.3510,423 shs$0.0008/07/2025$0.44$0.43-2.29%$0.45$0.406,625 shs$0.0008/06/2025$0.45$0.44-3.10%$0.48$0.472,595 shs$0.0008/05/2025$0.46$0.45-1.96%$0.49$0.404,628 shs$0.0008/04/2025$0.48$0.46-4.66%$0.49$0.409,535 shs$0.00 Related Companies HTGMQ Stock Price Chart OLITW Stock Price Chart PRENW Stock Price Chart SMAPW Stock Price Chart TT Stock Price Chart KEYS Stock Price Chart VLTO Stock Price Chart TER Stock Price Chart FTV Stock Price Chart RVTY Stock Price Chart Receive QSIAW 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:QSIAW) was last updated on 9/4/2025 by MarketBeat.com Staff From Our PartnersCapital Gains Tax Strategies for SeniorsCapital gains taxes can take a bite out of your retirement income—unless you have a smart strategy. 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