Quantum-Si - 5 Year Stock Price History | QSI

Historical daily share price chart and data for Quantum-Si since 2020 adjusted for splits and dividends. The latest closing stock price for Quantum-Si as of June 10, 2025 is 1.70.
  • The all-time high Quantum-Si stock closing price was 22.41 on February 18, 2021.
  • The Quantum-Si 52-week high stock price is 5.77, which is 239.4% above the current share price.
  • The Quantum-Si 52-week low stock price is 0.61, which is 64.1% below the current share price.
  • The average Quantum-Si stock price for the last 52 weeks is 1.34.
For more information on how our historical price data is adjusted see the Stock Price Adjustment Guide.
Quantum-Si Historical Annual Stock Price Data
Year Average Stock Price Year Open Year High Year Low Year Close Annual % Change
2025 1.6788 4.2600 4.2900 1.0800 1.7000 -37.04%
2024 1.3679 2.0300 3.6000 0.6330 2.7000 34.33%
2023 1.8685 1.8400 3.8900 1.1450 2.0100 9.84%
2022 3.6115 8.2200 8.2200 1.8200 1.8300 -76.75%
2021 9.9520 10.4900 22.4100 5.6500 7.8700 -22.46%
Sector Industry Market Cap Revenue
Computer and Technology Semiconductors $0.314B $0.003B
Quantum-Si Incorporated is a company pioneering next-generation semiconductor chip-based proteomics. Quantum-Si Incorporated, formerly known as HighCape Capital Acquisition Corp., is based in NEW YORK.
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POET Technologies (POET) Canada $0.356B 0.00
Aeluma (ALMU) United States $0.292B 0.00
Valens Semiconductor (VLN) Israel $0.230B 0.00
Atomera (ATOM) United States $0.185B 0.00
Nano Labs (NA) China $0.177B 0.00
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