Quantum-Si incorporated (QSI) Stock Chart
QSI price chart
Daily prices adjusted for splits and dividends. 1D and 5D show delayed intraday prices. Markers: E earnings, D dividend, S split.
Technical snapshot
Key levels & statistics
QSI performance vs the market
Total return, dividends reinvestedQSI monthly returns
QSI historical prices
QSI dividends & splits
About the QSI chart
Quantum-Si incorporated (QSI) closed at $1.12 on October 16, 2026, up 1.8% so far this year. The stock is trading 17.4% above its 200-day moving average of $0.95, which technical analysts usually read as a long-term uptrend. Over the past year QSI returned −55.9% including dividends, behind the S&P 500 (+16.8%).
This page charts the full trading history of Quantum-Si incorporated stock. Daily prices come from EODHD and are adjusted for stock splits and dividends, so returns over long periods are comparable. For the latest quote, company profile, earnings and news, see the QSI stock overview.
QSI chart FAQ
What is Quantum-Si incorporated's all-time high stock price?
The highest closing price for QSI was $22.41 on February 18, 2021 (adjusted for stock splits). As of the October 16, 2026 close it traded 95.0% below that level.
What is the 52-week range of QSI stock?
Over the 52 weeks to October 16, 2026, QSI traded between an intraday low of $0.69 on July 30, 2026 and an intraday high of $2.73 on October 20, 2025.
Is QSI above its 200-day moving average?
Yes. On October 16, 2026 QSI closed at $1.12, 17.4% above its 200-day simple moving average of $0.95. The 50-day average was $0.92.
How has QSI stock performed compared with the S&P 500?
Including reinvested dividends, QSI returned −55.9% over the past year, compared with +16.8% for the S&P 500 (SPY). Over five years the figures were −87.0% and +83.0%.
Does Quantum-Si incorporated pay a dividend?
Quantum-Si incorporated has not paid a dividend in the past 12 months.
How do I read the QSI chart?
Pick a time range above the chart and choose candlesticks, a line or an area chart. Moving averages, Bollinger Bands, volume, RSI and MACD can be switched on with the indicator buttons, and "Compare" plots QSI against the S&P 500, its sector or a competitor as a percentage change. Chart prices are adjusted for splits and dividends.