Quantum-Si incorporated (QSI)
NASDAQ: QSI · Real-Time Price · USD
2.540
-0.090 (-3.42%)
At close: Oct 16, 2025, 4:00 PM EDT
2.480
-0.060 (-2.36%)
After-hours: Oct 16, 2025, 7:59 PM EDT
Quantum-Si incorporated Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Oct 16, 2025 | 2.81 | 3.10 | 2.50 | 2.54 | 2.54 | -3.42% | 48,940,260 |
| Oct 15, 2025 | 2.45 | 2.75 | 2.36 | 2.63 | 2.63 | 22.33% | 53,572,323 |
| Oct 14, 2025 | 2.01 | 2.26 | 1.96 | 2.15 | 2.15 | 3.37% | 23,794,582 |
| Oct 13, 2025 | 1.75 | 2.13 | 1.73 | 2.08 | 2.08 | 24.55% | 33,370,615 |
| Oct 10, 2025 | 1.81 | 1.95 | 1.66 | 1.67 | 1.67 | -4.02% | 21,776,904 |
| Oct 9, 2025 | 1.77 | 1.80 | 1.69 | 1.74 | 1.74 | -1.69% | 6,852,637 |
| Oct 8, 2025 | 1.76 | 1.82 | 1.70 | 1.77 | 1.77 | - | 8,810,728 |
| Oct 7, 2025 | 1.85 | 1.92 | 1.68 | 1.77 | 1.77 | -2.21% | 18,189,350 |
| Oct 6, 2025 | 1.71 | 1.87 | 1.66 | 1.81 | 1.81 | 5.23% | 17,235,682 |
| Oct 3, 2025 | 1.57 | 1.76 | 1.56 | 1.72 | 1.72 | 11.69% | 19,291,713 |
| 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% | 5,506,554 |
| Sep 30, 2025 | 1.36 | 1.44 | 1.35 | 1.41 | 1.41 | 1.44% | 5,733,688 |
| 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% | 10,700,557 |
| Sep 24, 2025 | 1.64 | 1.75 | 1.59 | 1.61 | 1.61 | 0.63% | 13,282,695 |
| Sep 23, 2025 | 1.78 | 1.79 | 1.56 | 1.60 | 1.60 | -5.88% | 21,284,357 |
| 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% | 7,290,684 |
| 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% | 7,399,164 |
| Sep 10, 2025 | 1.15 | 1.16 | 1.08 | 1.12 | 1.12 | -2.61% | 4,230,873 |
| 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 |
| Sep 5, 2025 | 1.07 | 1.10 | 1.03 | 1.08 | 1.08 | 0.93% | 3,433,260 |
| Sep 4, 2025 | 1.07 | 1.08 | 1.03 | 1.07 | 1.07 | - | 3,698,750 |
| Sep 3, 2025 | 1.08 | 1.11 | 1.03 | 1.07 | 1.07 | -0.93% | 3,765,244 |
| Sep 2, 2025 | 1.10 | 1.13 | 1.07 | 1.08 | 1.08 | -3.57% | 4,078,682 |
| Aug 29, 2025 | 1.14 | 1.15 | 1.10 | 1.12 | 1.12 | -2.61% | 3,471,787 |
| Aug 28, 2025 | 1.19 | 1.22 | 1.13 | 1.15 | 1.15 | -0.86% | 4,261,908 |
| Aug 27, 2025 | 1.16 | 1.22 | 1.15 | 1.16 | 1.16 | -0.85% | 5,191,520 |
| Aug 26, 2025 | 1.13 | 1.18 | 1.11 | 1.17 | 1.17 | 2.63% | 3,624,365 |
| Aug 25, 2025 | 1.13 | 1.17 | 1.11 | 1.14 | 1.14 | - | 3,877,413 |
| Aug 22, 2025 | 1.10 | 1.16 | 1.06 | 1.14 | 1.14 | 2.70% | 6,872,459 |
| Aug 21, 2025 | 0.98 | 1.14 | 0.98 | 1.11 | 1.11 | 11.00% | 9,296,919 |
| Aug 20, 2025 | 1.01 | 1.02 | 0.95 | 1.00 | 1.00 | -2.91% | 11,048,277 |
| Aug 19, 2025 | 1.13 | 1.14 | 1.02 | 1.03 | 1.03 | -5.50% | 7,997,647 |
| Aug 18, 2025 | 1.11 | 1.12 | 1.09 | 1.09 | 1.09 | -0.91% | 4,931,097 |
| Aug 15, 2025 | 1.13 | 1.14 | 1.09 | 1.10 | 1.10 | -1.79% | 5,863,645 |
| Aug 14, 2025 | 1.18 | 1.19 | 1.08 | 1.12 | 1.12 | -4.27% | 9,810,755 |
| Aug 13, 2025 | 1.19 | 1.21 | 1.14 | 1.17 | 1.17 | 0.86% | 7,961,070 |
| Aug 12, 2025 | 1.20 | 1.22 | 1.14 | 1.16 | 1.16 | -3.33% | 9,882,629 |
| Aug 11, 2025 | 1.27 | 1.28 | 1.18 | 1.20 | 1.20 | -5.51% | 8,681,807 |
| Aug 8, 2025 | 1.33 | 1.35 | 1.26 | 1.27 | 1.27 | -4.51% | 6,536,088 |
| Aug 7, 2025 | 1.36 | 1.38 | 1.31 | 1.33 | 1.33 | -2.92% | 4,185,198 |