Quantum-Si incorporated (QSI)
NASDAQ: QSI · Real-Time Price · USD
0.7600
-0.0060 (-0.78%)
At close: Sep 8, 2026, 4:00 PM EDT
0.7725
+0.0125 (1.64%)
After-hours: Sep 8, 2026, 7:54 PM EDT
Quantum-Si incorporated Stock Price History
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Sep 8, 2026 | 0.77 | 0.79 | 0.76 | 0.76 | 0.76 | -0.78% | 1,046,463 |
| Sep 4, 2026 | 0.76 | 0.77 | 0.76 | 0.77 | 0.77 | 0.66% | 893,464 |
| Sep 3, 2026 | 0.77 | 0.79 | 0.76 | 0.76 | 0.76 | - | 956,505 |
| Sep 2, 2026 | 0.76 | 0.79 | 0.75 | 0.76 | 0.76 | 0.49% | 1,603,826 |
| Sep 1, 2026 | 0.75 | 0.78 | 0.75 | 0.76 | 0.76 | -1.12% | 1,499,347 |
| Aug 31, 2026 | 0.78 | 0.78 | 0.76 | 0.77 | 0.77 | -1.81% | 1,126,970 |
| Aug 28, 2026 | 0.82 | 0.82 | 0.77 | 0.78 | 0.78 | -2.88% | 2,411,752 |
| Aug 27, 2026 | 0.79 | 0.83 | 0.79 | 0.80 | 0.80 | 1.58% | 1,370,158 |
| Aug 26, 2026 | 0.85 | 0.86 | 0.79 | 0.79 | 0.79 | -6.69% | 2,633,598 |
| Aug 25, 2026 | 0.79 | 0.86 | 0.78 | 0.85 | 0.85 | 10.14% | 4,325,292 |
| Aug 24, 2026 | 0.80 | 0.83 | 0.75 | 0.77 | 0.77 | -7.87% | 3,808,634 |
| Aug 21, 2026 | 0.78 | 0.93 | 0.78 | 0.84 | 0.84 | 7.05% | 7,724,359 |
| Aug 20, 2026 | 0.77 | 0.81 | 0.77 | 0.78 | 0.78 | 1.29% | 3,226,576 |
| Aug 19, 2026 | 0.72 | 0.78 | 0.72 | 0.77 | 0.77 | 5.78% | 2,854,279 |
| Aug 18, 2026 | 0.73 | 0.74 | 0.72 | 0.73 | 0.73 | -2.18% | 1,504,758 |
| Aug 17, 2026 | 0.74 | 0.80 | 0.74 | 0.74 | 0.74 | 0.59% | 2,423,934 |
| Aug 14, 2026 | 0.75 | 0.77 | 0.71 | 0.74 | 0.74 | -6.35% | 6,958,558 |
| Aug 13, 2026 | 0.86 | 0.91 | 0.79 | 0.79 | 0.79 | -5.66% | 4,107,477 |
| Aug 12, 2026 | 0.83 | 0.87 | 0.83 | 0.84 | 0.84 | 2.10% | 1,469,484 |
| Aug 11, 2026 | 0.80 | 0.85 | 0.80 | 0.82 | 0.82 | 3.81% | 2,026,474 |
| Aug 10, 2026 | 0.82 | 0.84 | 0.79 | 0.79 | 0.79 | -2.98% | 2,422,839 |
| Aug 7, 2026 | 0.76 | 0.83 | 0.76 | 0.81 | 0.81 | 7.87% | 2,708,369 |
| Aug 6, 2026 | 0.75 | 0.78 | 0.75 | 0.76 | 0.76 | -0.20% | 1,451,230 |
| Aug 5, 2026 | 0.78 | 0.79 | 0.76 | 0.76 | 0.76 | -1.16% | 2,466,598 |
| Aug 4, 2026 | 0.76 | 0.80 | 0.76 | 0.77 | 0.77 | 2.60% | 3,984,739 |
| Aug 3, 2026 | 0.72 | 0.76 | 0.71 | 0.75 | 0.75 | 4.72% | 2,706,253 |
| Jul 31, 2026 | 0.73 | 0.75 | 0.71 | 0.71 | 0.71 | -1.06% | 1,840,507 |
| Jul 30, 2026 | 0.73 | 0.74 | 0.69 | 0.72 | 0.72 | 2.52% | 3,557,133 |
| Jul 29, 2026 | 0.76 | 0.78 | 0.70 | 0.70 | 0.70 | -7.67% | 4,102,774 |
| Jul 28, 2026 | 0.78 | 0.78 | 0.74 | 0.76 | 0.76 | -2.91% | 3,268,923 |
| Jul 27, 2026 | 0.79 | 0.81 | 0.77 | 0.78 | 0.78 | 1.73% | 1,086,514 |
| Jul 24, 2026 | 0.79 | 0.80 | 0.76 | 0.77 | 0.77 | -2.52% | 2,588,776 |
| Jul 23, 2026 | 0.79 | 0.83 | 0.78 | 0.79 | 0.79 | -1.25% | 3,288,670 |
| Jul 22, 2026 | 0.81 | 0.85 | 0.80 | 0.80 | 0.80 | -4.31% | 2,843,612 |
| Jul 21, 2026 | 0.82 | 0.85 | 0.82 | 0.84 | 0.84 | 2.33% | 1,470,894 |
| Jul 20, 2026 | 0.83 | 0.84 | 0.81 | 0.82 | 0.82 | -0.66% | 1,502,339 |
| Jul 17, 2026 | 0.82 | 0.85 | 0.80 | 0.82 | 0.82 | 0.38% | 2,295,009 |
| Jul 16, 2026 | 0.85 | 0.86 | 0.81 | 0.82 | 0.82 | -4.95% | 3,743,406 |
| Jul 15, 2026 | 0.87 | 0.90 | 0.86 | 0.86 | 0.86 | -0.48% | 2,255,407 |
| Jul 14, 2026 | 0.87 | 0.90 | 0.86 | 0.87 | 0.87 | -0.36% | 1,213,247 |
| Jul 13, 2026 | 0.88 | 0.88 | 0.85 | 0.87 | 0.87 | -1.52% | 3,532,949 |
| Jul 10, 2026 | 0.95 | 0.95 | 0.88 | 0.88 | 0.88 | -8.28% | 2,906,641 |
| Jul 9, 2026 | 0.91 | 0.97 | 0.90 | 0.96 | 0.96 | 5.45% | 2,575,863 |
| Jul 8, 2026 | 0.89 | 0.93 | 0.89 | 0.91 | 0.91 | -0.74% | 3,422,649 |
| Jul 7, 2026 | 0.94 | 0.95 | 0.90 | 0.92 | 0.92 | -3.38% | 3,710,303 |
| Jul 6, 2026 | 0.93 | 0.98 | 0.93 | 0.95 | 0.95 | 2.29% | 2,626,554 |
| Jul 2, 2026 | 0.93 | 1.01 | 0.92 | 0.93 | 0.93 | 0.68% | 6,037,313 |
| Jul 1, 2026 | 0.88 | 0.96 | 0.88 | 0.92 | 0.92 | 4.42% | 5,506,506 |
| Jun 30, 2026 | 0.88 | 0.92 | 0.87 | 0.89 | 0.89 | -0.44% | 3,187,245 |
| Jun 29, 2026 | 0.86 | 0.91 | 0.85 | 0.89 | 0.89 | 3.99% | 3,989,704 |