Quantum-Si incorporated (QSI)
NASDAQ: QSI · Real-Time Price · USD
0.865
-0.047 (-5.18%)
At close: Apr 29, 2026, 4:00 PM EDT
0.879
+0.014 (1.63%)
After-hours: Apr 29, 2026, 5:50 PM EDT
Quantum-Si incorporated Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Apr 29, 2026 | 0.90 | 0.91 | 0.86 | 0.86 | - | -5.18% | 3,140,370 |
| Apr 28, 2026 | 0.89 | 0.94 | 0.89 | 0.91 | 0.91 | 1.30% | 3,159,350 |
| Apr 27, 2026 | 0.91 | 0.94 | 0.87 | 0.90 | 0.90 | -0.61% | 3,118,018 |
| Apr 24, 2026 | 0.98 | 0.98 | 0.90 | 0.91 | 0.91 | -3.70% | 7,282,600 |
| Apr 23, 2026 | 1.03 | 1.04 | 0.92 | 0.94 | 0.94 | -11.26% | 7,311,019 |
| Apr 22, 2026 | 0.99 | 1.07 | 0.96 | 1.06 | 1.06 | 8.50% | 11,054,678 |
| Apr 21, 2026 | 1.00 | 1.05 | 0.98 | 0.98 | 0.98 | -3.27% | 5,203,062 |
| Apr 20, 2026 | 1.02 | 1.06 | 0.98 | 1.01 | 1.01 | -5.61% | 7,820,642 |
| Apr 17, 2026 | 1.07 | 1.14 | 1.06 | 1.07 | 1.07 | 2.88% | 7,021,500 |
| Apr 16, 2026 | 1.08 | 1.09 | 1.00 | 1.04 | 1.04 | -0.95% | 7,641,472 |
| Apr 15, 2026 | 0.90 | 1.06 | 0.90 | 1.05 | 1.05 | 24.88% | 17,707,467 |
| Apr 14, 2026 | 0.80 | 0.86 | 0.80 | 0.84 | 0.84 | 6.61% | 3,070,566 |
| Apr 13, 2026 | 0.74 | 0.79 | 0.72 | 0.79 | 0.79 | 6.51% | 2,650,507 |
| Apr 10, 2026 | 0.75 | 0.77 | 0.73 | 0.74 | 0.74 | -0.86% | 1,881,862 |
| Apr 9, 2026 | 0.75 | 0.76 | 0.73 | 0.75 | 0.75 | -0.48% | 2,638,571 |
| Apr 8, 2026 | 0.78 | 0.78 | 0.74 | 0.75 | 0.75 | 5.50% | 3,188,982 |
| Apr 7, 2026 | 0.73 | 0.73 | 0.69 | 0.71 | 0.71 | -2.43% | 3,515,255 |
| Apr 6, 2026 | 0.74 | 0.77 | 0.73 | 0.73 | 0.73 | -2.50% | 1,890,500 |
| Apr 2, 2026 | 0.74 | 0.76 | 0.72 | 0.75 | 0.75 | 0.03% | 2,571,803 |
| Apr 1, 2026 | 0.79 | 0.80 | 0.75 | 0.75 | 0.75 | -3.41% | 2,354,460 |
| Mar 31, 2026 | 0.76 | 0.80 | 0.76 | 0.77 | 0.77 | 4.91% | 2,872,471 |
| Mar 30, 2026 | 0.76 | 0.78 | 0.73 | 0.74 | 0.74 | -3.44% | 3,758,169 |
| Mar 27, 2026 | 0.80 | 0.82 | 0.76 | 0.76 | 0.76 | -5.52% | 3,169,678 |
| Mar 26, 2026 | 0.86 | 0.86 | 0.81 | 0.81 | 0.81 | -6.51% | 2,619,269 |
| Mar 25, 2026 | 0.86 | 0.90 | 0.86 | 0.87 | 0.87 | 1.63% | 2,549,869 |
| Mar 24, 2026 | 0.89 | 0.90 | 0.83 | 0.85 | 0.85 | -5.22% | 2,660,281 |
| Mar 23, 2026 | 0.85 | 0.91 | 0.79 | 0.90 | 0.90 | 6.26% | 4,568,838 |
| Mar 20, 2026 | 0.87 | 0.88 | 0.83 | 0.85 | 0.85 | -1.88% | 3,813,291 |
| Mar 19, 2026 | 0.88 | 0.89 | 0.85 | 0.86 | 0.86 | -2.39% | 2,419,119 |
| Mar 18, 2026 | 0.93 | 0.94 | 0.88 | 0.88 | 0.88 | -5.14% | 3,158,802 |
| Mar 17, 2026 | 0.95 | 0.96 | 0.92 | 0.93 | 0.93 | -1.41% | 2,787,347 |
| Mar 16, 2026 | 0.96 | 0.98 | 0.94 | 0.94 | 0.94 | -0.64% | 2,701,770 |
| Mar 13, 2026 | 0.98 | 1.01 | 0.93 | 0.95 | 0.95 | -2.70% | 2,835,009 |
| Mar 12, 2026 | 1.02 | 1.02 | 0.95 | 0.98 | 0.98 | -7.05% | 3,977,826 |
| Mar 11, 2026 | 1.05 | 1.07 | 1.00 | 1.05 | 1.05 | 0.96% | 3,613,642 |
| Mar 10, 2026 | 0.94 | 1.10 | 0.94 | 1.04 | 1.04 | 12.32% | 8,474,557 |
| Mar 9, 2026 | 0.88 | 0.93 | 0.85 | 0.93 | 0.93 | 7.44% | 4,955,006 |
| Mar 6, 2026 | 0.89 | 0.90 | 0.84 | 0.86 | 0.86 | -5.24% | 5,636,902 |
| Mar 5, 2026 | 0.90 | 0.97 | 0.89 | 0.91 | 0.91 | -0.05% | 4,219,538 |
| Mar 4, 2026 | 0.95 | 0.98 | 0.91 | 0.91 | 0.91 | -4.01% | 2,970,475 |
| Mar 3, 2026 | 0.92 | 0.97 | 0.90 | 0.95 | 0.95 | 1.56% | 3,196,938 |
| Mar 2, 2026 | 0.93 | 0.96 | 0.91 | 0.93 | 0.93 | -2.40% | 1,840,206 |
| Feb 27, 2026 | 0.98 | 1.00 | 0.95 | 0.96 | 0.96 | -5.31% | 2,595,522 |
| Feb 26, 2026 | 1.01 | 1.03 | 0.97 | 1.01 | 1.01 | 2.01% | 2,267,939 |
| Feb 25, 2026 | 0.95 | 1.02 | 0.93 | 0.99 | 0.99 | 6.44% | 3,162,889 |
| Feb 24, 2026 | 0.91 | 0.95 | 0.91 | 0.93 | 0.93 | 2.01% | 1,370,156 |
| Feb 23, 2026 | 0.94 | 0.95 | 0.90 | 0.91 | 0.91 | -3.07% | 1,888,673 |
| Feb 20, 2026 | 0.96 | 0.96 | 0.93 | 0.94 | 0.94 | -2.07% | 1,754,682 |
| Feb 19, 2026 | 0.90 | 0.98 | 0.89 | 0.96 | 0.96 | 5.99% | 3,993,492 |
| Feb 18, 2026 | 0.96 | 0.98 | 0.90 | 0.91 | 0.91 | -3.45% | 4,913,424 |
| Feb 17, 2026 | 0.99 | 0.99 | 0.94 | 0.94 | 0.94 | -5.23% | 3,547,286 |
| Feb 13, 2026 | 0.99 | 1.05 | 0.99 | 0.99 | 0.99 | 1.59% | 3,127,829 |
| Feb 12, 2026 | 1.05 | 1.06 | 0.96 | 0.98 | 0.98 | -6.24% | 5,890,675 |
| Feb 11, 2026 | 1.12 | 1.12 | 1.01 | 1.04 | 1.04 | -5.45% | 4,048,955 |
| Feb 10, 2026 | 1.10 | 1.11 | 1.06 | 1.10 | 1.10 | 2.80% | 3,669,788 |
| Feb 9, 2026 | 1.09 | 1.09 | 1.02 | 1.07 | 1.07 | 0.47% | 3,147,984 |
| Feb 6, 2026 | 1.02 | 1.09 | 0.96 | 1.07 | 1.07 | 14.26% | 7,481,632 |
| Feb 5, 2026 | 1.03 | 1.04 | 0.92 | 0.93 | 0.93 | -9.50% | 8,157,489 |
| Feb 4, 2026 | 1.10 | 1.11 | 1.00 | 1.03 | 1.03 | -5.50% | 6,372,623 |
| Feb 3, 2026 | 1.11 | 1.13 | 1.05 | 1.09 | 1.09 | -0.91% | 5,044,796 |
| Feb 2, 2026 | 1.11 | 1.13 | 1.09 | 1.10 | 1.10 | -2.65% | 3,771,977 |
| Jan 30, 2026 | 1.16 | 1.19 | 1.11 | 1.13 | 1.13 | -3.42% | 5,467,545 |
| Jan 29, 2026 | 1.20 | 1.21 | 1.13 | 1.17 | 1.17 | -2.50% | 6,195,553 |
| Jan 28, 2026 | 1.23 | 1.24 | 1.17 | 1.20 | 1.20 | -2.44% | 3,995,857 |
| Jan 27, 2026 | 1.22 | 1.26 | 1.20 | 1.23 | 1.23 | 1.65% | 2,862,494 |
| Jan 26, 2026 | 1.25 | 1.27 | 1.21 | 1.21 | 1.21 | -3.20% | 3,159,298 |
| Jan 23, 2026 | 1.31 | 1.32 | 1.24 | 1.25 | 1.25 | -4.58% | 4,115,588 |
| Jan 22, 2026 | 1.23 | 1.33 | 1.22 | 1.31 | 1.31 | 6.50% | 6,410,600 |
| Jan 21, 2026 | 1.20 | 1.24 | 1.14 | 1.23 | 1.23 | 3.36% | 4,912,116 |
| Jan 20, 2026 | 1.21 | 1.24 | 1.18 | 1.19 | 1.19 | -6.30% | 5,735,217 |
| Jan 16, 2026 | 1.25 | 1.32 | 1.23 | 1.27 | 1.27 | 3.25% | 5,462,743 |
| Jan 15, 2026 | 1.29 | 1.30 | 1.23 | 1.23 | 1.23 | -3.15% | 3,687,382 |
| Jan 14, 2026 | 1.27 | 1.31 | 1.24 | 1.27 | 1.27 | - | 4,428,131 |
| Jan 13, 2026 | 1.25 | 1.32 | 1.20 | 1.27 | 1.27 | 4.96% | 5,767,924 |
| Jan 12, 2026 | 1.21 | 1.25 | 1.18 | 1.21 | 1.21 | -0.82% | 4,925,431 |
| Jan 9, 2026 | 1.27 | 1.28 | 1.21 | 1.22 | 1.22 | -2.40% | 4,460,516 |
| 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 |