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0.8343
6.28%
0.0493
After Hours:
.84
0.0057
+0.68%
Quantum Si Incorporated Stock (QSI) Price History
The historical daily chart and data for Quantum Si Incorporated stock (QSI), show that the latest closing stock price as of September 25, 2026, is $0.8343.
- Quantum Si Incorporated all-time high stock price is $10.15, occurred on September 01, 2021.
- The lowest Quantum Si Incorporated stock price recorded was $0.6121 on November 19, 2024. Since then, Quantum Si Incorporated's stock price has risen over 36.30% to $0.8343 now.
- The 52-week high stock price for QSI is $3.10, representing a 271.57% increase from the current share price, occurred on October 16, 2025.
- The 52-week low stock price for QSI is $0.69, indicating a -17.30% decrease from the current share price, occurred on July 30, 2026.
- The closing price of Quantum Si Incorporated (QSI) stock in the beginning of 2025 was $8.2201. The stock closed the year at $1.83, a loss of over -77.74% for the year.
The table below shows more information about QSI historical price data:
Daily
Weekly
Monthly
7D
30D
60D
YTD
1Y
| Date | High | Low | High - Low | Volume | % Change |
|---|---|---|---|---|---|
| Sep 25, 2026 | $0.84 | $0.7755 | $0.0645 | 2,570,447.0 | +6.28% |
| Sep 24, 2026 | $0.7991 | $0.7434 | $0.0557 | 1,570,482.0 | +3.47% |
| Sep 23, 2026 | $0.805 | $0.7515 | $0.0535 | 1,449,227.0 | -3.31% |
| Sep 22, 2026 | $0.792 | $0.7511 | $0.0409 | 2,391,823.0 | +3.81% |
| Sep 21, 2026 | $0.7661 | $0.75 | $0.0161 | 1,119,681.0 | +1.45% |
| Sep 18, 2026 | $0.8015 | $0.74 | $0.0615 | 1,695,186.0 | -3.23% |
| Sep 17, 2026 | $0.7963 | $0.7495 | $0.0468 | 2,822,321.0 | +5.47% |
| Sep 16, 2026 | $0.7532 | $0.721 | $0.0322 | 907,956.0 | +1.40% |
| Sep 15, 2026 | $0.7409 | $0.72 | $0.0209 | 1,155,381.0 | -0.69% |
| Sep 14, 2026 | $0.7478 | $0.7201 | $0.0277 | 1,386,993.0 | -2.03% |
| Sep 11, 2026 | $0.755 | $0.7391 | $0.0159 | 1,055,837.0 | +0.12% |
| Sep 10, 2026 | $0.755 | $0.7251 | $0.0299 | 1,710,396.0 | -1.45% |
| Sep 09, 2026 | $0.7748 | $0.746 | $0.0288 | 1,438,285.0 | -1.32% |
| Sep 08, 2026 | $0.79 | $0.76 | $0.03 | 1,046,888.0 | -0.78% |
| Sep 04, 2026 | $0.7742 | $0.76 | $0.0142 | 894,604.0 | +0.66% |
| Sep 03, 2026 | $0.7862 | $0.76 | $0.0262 | 958,279.0 | +0.00% |
| Sep 02, 2026 | $0.785 | $0.75 | $0.035 | 1,614,724.0 | +0.49% |
| Sep 01, 2026 | $0.7768 | $0.7499 | $0.0269 | 1,502,888.0 | -1.12% |
| Aug 31, 2026 | $0.78 | $0.763 | $0.017 | 1,129,685.0 | -1.81% |
Quantum Si Incorporated Stock (QSI) Year by Year Price History
In this detailed analysis, we present a comprehensive overview of the price movements of Quantum Si Incorporated stock over the years. By exploring the year-by-year data, investors can gain valuable insights into the historical performance and volatility of QSI shares. From significant milestones and fluctuations to notable trends, this in-depth examination of Quantum Si Incorporated stock price history provides a foundation for understanding how the company's stock has evolved over time.
Quantum Si Incorporated Stock (QSI) Price History 2026
| Month | High | Low | High - Low | Volume | % Change |
|---|---|---|---|---|---|
| Sep, 2026 | $0.84 | $0.72 | $0.12 | 29,861,845.0 | +8.93% |
| Aug, 2026 | $0.931 | $0.71 | $0.221 | 63,946,594.0 | +7.51% |
| Jul, 2026 | $1.01 | $0.69 | $0.32 | 65,016,703.0 | -19.50% |
| Jun, 2026 | $1.30 | $0.7802 | $0.5198 | 136,719,003.0 | -25.63% |
| May, 2026 | $1.21 | $0.821 | $0.389 | 128,563,869.0 | +21.35% |
| Apr, 2026 | $1.14 | $0.6912 | $0.4488 | 114,946,690.0 | +26.69% |
| Mar, 2026 | $1.10 | $0.7252 | $0.3748 | 78,030,480.0 | -19.07% |
| Feb, 2026 | $1.13 | $0.887 | $0.243 | 75,653,291.0 | -15.36% |
| Jan, 2026 | $1.34 | $1.11 | $0.23 | 99,940,985.0 | +2.73% |
Quantum Si Incorporated Stock (QSI) Price History 2025
| Month | High | Low | High - Low | Volume | % Change |
|---|---|---|---|---|---|
| Dec, 2025 | $1.54 | $1.10 | $0.44 | 96,175,752.0 | -21.28% |
| Nov, 2025 | $2.19 | $1.19 | $0.995 | 115,571,602.0 | -34.42% |
| Oct, 2025 | $3.10 | $1.41 | $1.69 | 401,229,971.0 | +52.48% |
| Sep, 2025 | $1.79 | $1.03 | $0.76 | 216,756,850.0 | +25.89% |
| Aug, 2025 | $1.49 | $0.9499 | $0.5401 | 136,180,923.0 | -24.32% |
| Jul, 2025 | $2.18 | $1.47 | $0.71 | 165,986,914.0 | -24.49% |
| Jun, 2025 | $2.14 | $1.55 | $0.59 | 158,414,170.0 | +16.67% |
| May, 2025 | $2.15 | $1.12 | $1.03 | 222,626,483.0 | +47.37% |
| Apr, 2025 | $1.30 | $1.02 | $0.285 | 63,004,922.0 | -5.00% |
| Mar, 2025 | $1.76 | $1.12 | $0.64 | 168,074,933.0 | -13.04% |
| Feb, 2025 | $2.25 | $1.28 | $0.97 | 167,420,487.0 | -30.30% |
| Jan, 2025 | $5.77 | $1.85 | $3.92 | 749,973,379.0 | -26.67% |
Quantum Si Incorporated Stock (QSI) Price History 2024
| Month | High | Low | High - Low | Volume | % Change |
|---|---|---|---|---|---|
| Dec, 2024 | $4.14 | $1.08 | $3.06 | 712,357,764.0 | +166.40% |
| Nov, 2024 | $1.89 | $0.6121 | $1.28 | 390,803,292.0 | +78.32% |
| Oct, 2024 | $0.9079 | $0.7001 | $0.2078 | 10,690,042.0 | -20.54% |
| Sep, 2024 | $1.10 | $0.8688 | $0.2312 | 8,883,893.0 | -6.82% |
| Aug, 2024 | $1.11 | $0.785 | $0.325 | 12,013,490.0 | -13.14% |
| Jul, 2024 | $1.26 | $0.8818 | $0.3782 | 13,645,905.0 | +3.81% |
| Jun, 2024 | $1.66 | $0.732 | $0.928 | 24,896,066.0 | -30.92% |
| May, 2024 | $1.99 | $1.50 | $0.49 | 12,210,599.0 | -5.59% |
| Apr, 2024 | $1.99 | $1.48 | $0.515 | 11,788,724.0 | -18.27% |
| Mar, 2024 | $2.43 | $1.54 | $0.89 | 22,630,215.0 | +17.96% |
| Feb, 2024 | $1.86 | $1.38 | $0.48 | 12,201,465.0 | +7.05% |
| Jan, 2024 | $2.16 | $1.53 | $0.629 | 12,246,791.0 | -22.39% |
1.51%
0.97%
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