Quantum-Si (QSI)
NASDAQ: QSI
· Real-Time Price · USD
1.72
0.18 (11.69%)
At close: Oct 03, 2025, 3:59 PM
1.71
-0.58%
After-hours: Oct 03, 2025, 07:57 PM EDT
QSI Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj Close | % Change | Volume |
|---|---|---|---|---|---|---|---|
| Oct 3, 2025 | 1.57 | 1.76 | 1.56 | 1.72 | 1.72 | 11.69% | 19,092,069 |
| Oct 2, 2025 | 1.49 | 1.56 | 1.46 | 1.54 | 1.54 | 5.48% | 8,024,442 |
| Oct 1, 2025 | 1.42 | 1.50 | 1.41 | 1.46 | 1.46 | 3.55% | 5,506,600 |
| Sep 30, 2025 | 1.36 | 1.44 | 1.35 | 1.41 | 1.41 | 1.44% | 5,733,700 |
| Sep 29, 2025 | 1.40 | 1.43 | 1.35 | 1.39 | 1.39 | -6.71% | 9,550,045 |
| Sep 26, 2025 | 1.54 | 1.61 | 1.47 | 1.49 | 1.49 | -1.32% | 7,793,707 |
| Sep 25, 2025 | 1.52 | 1.55 | 1.44 | 1.51 | 1.51 | -6.21% | 10,700,600 |
| Sep 24, 2025 | 1.64 | 1.75 | 1.59 | 1.61 | 1.61 | 0.63% | 13,282,700 |
| Sep 23, 2025 | 1.78 | 1.79 | 1.56 | 1.60 | 1.60 | -5.88% | 21,284,400 |
| Sep 22, 2025 | 1.53 | 1.73 | 1.43 | 1.70 | 1.70 | 13.33% | 24,913,430 |
| Sep 19, 2025 | 1.47 | 1.60 | 1.45 | 1.50 | 1.50 | -1.96% | 23,200,207 |
| Sep 18, 2025 | 1.31 | 1.64 | 1.30 | 1.53 | 1.53 | 21.43% | 37,180,141 |
| Sep 17, 2025 | 1.30 | 1.34 | 1.24 | 1.26 | 1.26 | -5.26% | 10,309,325 |
| Sep 16, 2025 | 1.29 | 1.34 | 1.25 | 1.33 | 1.33 | 5.56% | 7,290,700 |
| Sep 15, 2025 | 1.20 | 1.29 | 1.18 | 1.26 | 1.26 | 6.78% | 8,873,031 |
| Sep 12, 2025 | 1.22 | 1.26 | 1.17 | 1.18 | 1.18 | -1.67% | 6,110,612 |
| Sep 11, 2025 | 1.11 | 1.22 | 1.11 | 1.20 | 1.20 | 7.14% | 7,399,200 |
| Sep 10, 2025 | 1.15 | 1.16 | 1.08 | 1.12 | 1.12 | -2.61% | 4,230,900 |
| Sep 9, 2025 | 1.06 | 1.16 | 1.06 | 1.15 | 1.15 | 8.49% | 3,994,125 |
| Sep 8, 2025 | 1.09 | 1.10 | 1.04 | 1.06 | 1.06 | -1.85% | 4,089,700 |
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