QSI
Quantum-Si-A (QSI)
NASDAQ
$1.14-$0.09 (-7.72%)
Price as of Oct 22, 2026 7:39 PM EDT
  • $244.7M
    Market Cap
  • -44.09%
    1-Year Change
  • Medical Devices
    Industry
  • 1 Month
    +62.72%
    Low Price$0.76
    High Price$1.55
  • 3 Months
    +47.13%
    Low Price$0.70
    High Price$1.55
  • 1 Year
    -44.09%
    Low Price$0.70
    High Price$2.34
Date
Open
High
Low
Close
Change (%)
Volume
10/21/2026
1.16
1.23
1.16
1.23
+6.03%
3,422,744
10/20/2026
1.06
1.20
1.04
1.16
+6.42%
6,160,805
10/19/2026
1.15
1.15
1.01
1.09
-2.68%
8,691,379
10/16/2026
1.33
1.33
1.10
1.12
-14.50%
7,690,617
10/15/2026
1.35
1.39
1.24
1.31
-5.76%
9,269,416
10/14/2026
1.34
1.44
1.33
1.39
-1.42%
5,364,923
10/13/2026
1.35
1.46
1.31
1.41
+3.68%
6,239,642
10/12/2026
1.48
1.48
1.34
1.36
-11.11%
10,356,374
10/09/2026
1.26
1.66
1.26
1.53
+25.41%
40,903,937
10/08/2026
1.29
1.30
1.20
1.22
-4.69%
5,851,471
10/07/2026
1.17
1.31
1.09
1.28
+4.92%
8,036,980
10/06/2026
1.29
1.41
1.19
1.22
-4.69%
8,703,208
10/05/2026
1.53
1.53
1.26
1.28
-17.42%
19,184,998
10/02/2026
1.39
1.55
1.17
1.55
+8.39%
18,774,124
10/01/2026
1.20
1.48
1.15
1.43
+33.64%
33,062,747
09/30/2026
0.96
1.12
0.96
1.07
+11.68%
13,838,833
09/29/2026
0.81
1.03
0.81
0.96
+20.52%
23,007,057
09/28/2026
0.83
0.83
0.80
0.80
-4.71%
1,567,026
09/25/2026
0.79
0.84
0.78
0.83
+6.28%
2,593,482
09/24/2026
0.75
0.80
0.74
0.79
+3.47%
1,593,305
09/23/2026
0.79
0.81
0.75
0.76
-3.31%
1,476,524
09/22/2026
0.76
0.79
0.75
0.78
+3.81%
2,417,540
09/21/2026
0.76
0.77
0.75
0.76
+1.45%
1,126,539
09/18/2026
0.79
0.80
0.74
0.75
-3.23%
1,701,347
09/17/2026
0.75
0.80
0.75
0.77
+5.47%
2,824,983
09/16/2026
0.72
0.75
0.72
0.73
+1.40%
915,220
09/15/2026
0.72
0.74
0.72
0.72
-0.69%
1,166,814
09/14/2026
0.73
0.75
0.72
0.73
-2.03%
1,390,457
09/11/2026
0.74
0.76
0.74
0.74
+0.12%
1,074,254
09/10/2026
0.75
0.76
0.73
0.74
-1.45%
1,715,325
09/09/2026
0.76
0.77
0.75
0.75
-1.32%
1,449,017
09/08/2026
0.77
0.79
0.76
0.76
-0.78%
1,053,670
09/04/2026
0.76
0.77
0.76
0.77
+0.66%
898,780
09/03/2026
0.77
0.79
0.76
0.76
0.00%
979,996
09/02/2026
0.76
0.79
0.75
0.76
+0.49%
1,619,343
09/01/2026
0.75
0.78
0.75
0.76
-1.12%
1,504,027
08/31/2026
0.78
0.78
0.76
0.77
-1.81%
1,130,895
08/28/2026
0.82
0.82
0.77
0.78
-2.88%
2,417,639
08/27/2026
0.79
0.83
0.79
0.80
+1.58%
1,375,317
08/26/2026
0.85
0.86
0.79
0.79
-6.69%
2,662,728
08/25/2026
0.79
0.86
0.78
0.85
+10.14%
4,371,714
08/24/2026
0.80
0.83
0.75
0.77
-7.87%
3,853,818
08/21/2026
0.78
0.93
0.78
0.84
+7.05%
7,825,142
08/20/2026
0.77
0.81
0.77
0.78
+1.29%
3,233,617
08/19/2026
0.72
0.78
0.72
0.77
+5.78%
2,855,864
08/18/2026
0.73
0.74
0.72
0.73
-2.18%
1,520,320
08/17/2026
0.74
0.80
0.74
0.74
+0.59%
2,429,723
08/14/2026
0.75
0.77
0.71
0.74
-6.35%
6,999,480
08/13/2026
0.86
0.91
0.79
0.79
-5.66%
4,378,334
08/13/2026
-$0.11 Earnings
08/12/2026
0.83
0.87
0.83
0.84
+2.10%
1,499,136
08/11/2026
0.80
0.85
0.80
0.82
+3.81%
2,056,311
08/10/2026
0.82
0.84
0.79
0.79
-2.98%
2,434,391
08/07/2026
0.76
0.83
0.76
0.81
+7.87%
2,730,130
08/06/2026
0.75
0.78
0.75
0.76
-0.20%
1,493,531
08/05/2026
0.78
0.79
0.76
0.76
-1.16%
2,484,838
08/04/2026
0.76
0.80
0.76
0.77
+2.60%
3,986,331
08/03/2026
0.72
0.76
0.71
0.75
+4.72%
2,706,253
07/31/2026
0.73
0.75
0.71
0.71
-1.06%
1,840,507
07/30/2026
0.73
0.74
0.69
0.72
+2.52%
3,557,133
07/29/2026
0.76
0.78
0.70
0.70
-7.67%
4,102,774
07/28/2026
0.78
0.78
0.74
0.76
-2.91%
3,268,923
07/27/2026
0.79
0.81
0.77
0.78
+1.73%
1,086,514
07/24/2026
0.79
0.80
0.76
0.77
-2.52%
2,588,776
07/23/2026
0.79
0.83
0.78
0.79
-1.25%
3,288,670
07/22/2026
0.81
0.85
0.80
0.80
-4.31%
2,843,612
07/21/2026
0.82
0.85
0.82
0.84
+2.33%
1,470,894
07/20/2026
0.83
0.84
0.81
0.82
-0.66%
1,502,239
07/17/2026
0.82
0.85
0.80
0.82
+0.38%
2,295,009
07/16/2026
0.85
0.86
0.81
0.82
-4.95%
3,743,406
07/15/2026
0.87
0.90
0.86
0.86
-0.48%
2,254,275
07/14/2026
0.87
0.90
0.86
0.87
-0.36%
1,202,686
07/13/2026
0.88
0.88
0.85
0.87
-1.52%
3,532,949
07/10/2026
0.95
0.95
0.88
0.88
-8.28%
2,906,541
07/09/2026
0.91
0.97
0.90
0.96
+5.45%
2,575,863
07/08/2026
0.89
0.93
0.89
0.91
-0.74%
3,421,649
07/07/2026
0.94
0.95
0.90
0.92
-3.38%
3,710,303
07/06/2026
0.93
0.98
0.93
0.95
+2.29%
2,626,554
07/02/2026
0.93
1.01
0.92
0.93
+0.68%
6,037,313
07/01/2026
0.88
0.96
0.88
0.92
+4.42%
5,506,506
06/30/2026
0.88
0.92
0.87
0.89
-0.44%
3,187,245
06/29/2026
0.86
0.91
0.85
0.89
+3.99%
3,989,604
06/26/2026
0.84
0.89
0.80
0.85
-0.29%
18,909,693
06/25/2026
0.85
0.89
0.78
0.86
+3.64%
8,412,380
06/24/2026
0.90
0.92
0.83
0.83
-6.00%
5,134,223
06/23/2026
0.91
0.93
0.88
0.88
-4.47%
5,546,420
06/22/2026
1.00
1.07
0.92
0.92
-7.79%
5,934,924
06/18/2026
0.96
1.03
0.96
1.00
+5.79%
6,343,780
06/17/2026
0.97
1.00
0.93
0.94
-1.02%
3,473,136
06/16/2026
1.00
1.00
0.94
0.95
-3.49%
3,727,901
06/15/2026
1.01
1.05
0.98
0.99
+4.42%
9,422,150
06/12/2026
0.98
1.01
0.93
0.95
-2.70%
3,328,012
06/11/2026
0.95
0.98
0.92
0.97
+2.80%
3,444,732
06/10/2026
0.98
1.02
0.95
0.95
-4.11%
3,451,896
06/09/2026
1.06
1.08
0.94
0.99
-6.88%
8,116,798
06/08/2026
1.09
1.10
1.03
1.06
+0.95%
4,310,428
06/05/2026
1.25
1.25
1.01
1.05
-17.97%
8,905,019
06/04/2026
1.19
1.30
1.17
1.28
+7.56%
9,559,236
06/03/2026
1.22
1.22
1.16
1.19
-4.03%
7,951,310
06/02/2026
1.17
1.26
1.16
1.24
+5.08%
7,380,077