Quantum-Si incorporated (QSI)
NASDAQ: QSI · Real-Time Price · USD
1.100
-0.030 (-2.65%)
At close: Feb 2, 2026, 4:00 PM EST
1.110
+0.010 (0.91%)
After-hours: Feb 2, 2026, 6:51 PM EST
Quantum-Si incorporated Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Feb 2, 2026 | 1.11 | 1.13 | 1.09 | 1.10 | 1.10 | -2.65% | 3,741,410 |
| Jan 30, 2026 | 1.16 | 1.19 | 1.11 | 1.13 | 1.13 | -3.42% | 5,411,907 |
| Jan 29, 2026 | 1.20 | 1.21 | 1.13 | 1.17 | 1.17 | -2.50% | 6,121,144 |
| Jan 28, 2026 | 1.23 | 1.24 | 1.17 | 1.20 | 1.20 | -2.44% | 3,851,182 |
| Jan 27, 2026 | 1.22 | 1.26 | 1.20 | 1.23 | 1.23 | 1.65% | 2,801,259 |
| Jan 26, 2026 | 1.25 | 1.27 | 1.21 | 1.21 | 1.21 | -3.20% | 3,088,906 |
| Jan 23, 2026 | 1.31 | 1.32 | 1.24 | 1.25 | 1.25 | -4.58% | 4,036,112 |
| Jan 22, 2026 | 1.23 | 1.33 | 1.22 | 1.31 | 1.31 | 6.50% | 6,352,030 |
| Jan 21, 2026 | 1.20 | 1.24 | 1.14 | 1.23 | 1.23 | 3.36% | 4,896,116 |
| Jan 20, 2026 | 1.21 | 1.24 | 1.18 | 1.19 | 1.19 | -6.30% | 5,641,105 |
| Jan 16, 2026 | 1.25 | 1.32 | 1.23 | 1.27 | 1.27 | 3.25% | 5,377,801 |
| Jan 15, 2026 | 1.29 | 1.30 | 1.23 | 1.23 | 1.23 | -3.15% | 3,656,506 |
| Jan 14, 2026 | 1.27 | 1.31 | 1.24 | 1.27 | 1.27 | - | 4,337,857 |
| Jan 13, 2026 | 1.25 | 1.32 | 1.20 | 1.27 | 1.27 | 4.96% | 5,510,845 |
| Jan 12, 2026 | 1.21 | 1.25 | 1.18 | 1.21 | 1.21 | -0.82% | 4,684,250 |
| Jan 9, 2026 | 1.27 | 1.28 | 1.21 | 1.22 | 1.22 | -2.40% | 4,421,206 |
| Jan 8, 2026 | 1.25 | 1.31 | 1.24 | 1.25 | 1.25 | -0.79% | 4,893,077 |
| Jan 7, 2026 | 1.29 | 1.32 | 1.26 | 1.26 | 1.26 | -1.56% | 4,107,769 |
| Jan 6, 2026 | 1.26 | 1.34 | 1.26 | 1.28 | 1.28 | 1.59% | 7,655,044 |
| Jan 5, 2026 | 1.19 | 1.31 | 1.19 | 1.26 | 1.26 | 8.62% | 8,340,539 |
| Jan 2, 2026 | 1.15 | 1.16 | 1.11 | 1.16 | 1.16 | 5.45% | 4,871,648 |
| Dec 31, 2025 | 1.11 | 1.15 | 1.07 | 1.10 | 1.10 | -0.90% | 5,902,294 |
| Dec 30, 2025 | 1.16 | 1.17 | 1.10 | 1.11 | 1.11 | -5.93% | 7,955,380 |
| Dec 29, 2025 | 1.21 | 1.26 | 1.17 | 1.18 | 1.18 | -4.07% | 8,021,451 |
| Dec 26, 2025 | 1.31 | 1.31 | 1.22 | 1.23 | 1.23 | -6.11% | 4,175,380 |
| Dec 24, 2025 | 1.24 | 1.33 | 1.24 | 1.31 | 1.31 | 6.50% | 4,344,521 |
| Dec 23, 2025 | 1.25 | 1.26 | 1.20 | 1.23 | 1.23 | -3.15% | 4,209,448 |
| Dec 22, 2025 | 1.28 | 1.32 | 1.25 | 1.27 | 1.27 | - | 5,156,059 |
| Dec 19, 2025 | 1.22 | 1.29 | 1.21 | 1.27 | 1.27 | 4.10% | 6,700,084 |
| Dec 18, 2025 | 1.24 | 1.31 | 1.21 | 1.22 | 1.22 | 1.67% | 3,418,947 |
| Dec 17, 2025 | 1.24 | 1.28 | 1.20 | 1.20 | 1.20 | -1.64% | 3,826,984 |
| Dec 16, 2025 | 1.21 | 1.26 | 1.18 | 1.22 | 1.22 | -0.81% | 4,898,602 |
| Dec 15, 2025 | 1.31 | 1.32 | 1.22 | 1.23 | 1.23 | -4.65% | 4,129,140 |
| Dec 12, 2025 | 1.40 | 1.43 | 1.29 | 1.29 | 1.29 | -7.86% | 5,641,030 |
| Dec 11, 2025 | 1.44 | 1.44 | 1.35 | 1.40 | 1.40 | -2.78% | 4,342,003 |
| Dec 10, 2025 | 1.42 | 1.45 | 1.39 | 1.44 | 1.44 | 1.41% | 3,567,291 |
| Dec 9, 2025 | 1.44 | 1.46 | 1.39 | 1.42 | 1.42 | -2.07% | 3,710,382 |
| Dec 8, 2025 | 1.47 | 1.54 | 1.41 | 1.45 | 1.45 | 0.69% | 3,170,964 |
| Dec 5, 2025 | 1.48 | 1.49 | 1.41 | 1.44 | 1.44 | -2.04% | 3,673,275 |
| Dec 4, 2025 | 1.34 | 1.49 | 1.34 | 1.47 | 1.47 | 8.09% | 5,885,608 |
| Dec 3, 2025 | 1.28 | 1.36 | 1.26 | 1.36 | 1.36 | 7.09% | 4,068,880 |
| Dec 2, 2025 | 1.30 | 1.34 | 1.27 | 1.27 | 1.27 | -1.55% | 3,326,862 |
| Dec 1, 2025 | 1.36 | 1.36 | 1.28 | 1.29 | 1.29 | -8.51% | 3,490,419 |
| Nov 28, 2025 | 1.36 | 1.43 | 1.36 | 1.41 | 1.41 | 4.44% | 2,455,624 |
| Nov 26, 2025 | 1.36 | 1.39 | 1.31 | 1.35 | 1.35 | - | 4,590,912 |
| Nov 25, 2025 | 1.36 | 1.37 | 1.29 | 1.35 | 1.35 | - | 3,544,906 |
| Nov 24, 2025 | 1.27 | 1.35 | 1.26 | 1.35 | 1.35 | 6.30% | 4,733,966 |
| Nov 21, 2025 | 1.22 | 1.28 | 1.19 | 1.27 | 1.27 | 2.42% | 5,215,927 |
| Nov 20, 2025 | 1.37 | 1.40 | 1.23 | 1.24 | 1.24 | -3.13% | 6,779,598 |
| Nov 19, 2025 | 1.27 | 1.38 | 1.25 | 1.28 | 1.28 | 0.79% | 5,939,770 |