NASDAQ:QSI | Stock Price History | Quantum-Si Inc

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
2020-11-13 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$0.63$1.24$2.44$4.80$9.44$18.602020-11-132026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

Historical Stock Price

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2026-09-04$0.777,528
2026-09-03$0.7813,883
2026-09-02$0.775,579
2026-09-01$0.766,397
2026-08-31$0.787,749
2026-08-28$0.8218,804
2026-08-27$0.80$0.801,373,600$0.8017,983
2026-08-26$0.79$0.792,662,900$0.8539,981
2026-08-25$0.85$0.854,366,300$0.7982,463
2026-08-24$0.77$0.773,853,800$0.8042,804
2026-08-21$0.84$0.847,825,100$0.8283,411
2026-08-20$0.78$0.783,233,600$0.78131,794
2026-08-19$0.77$0.772,863,200$0.7371,914
2026-08-18$0.73$0.731,520,300$0.7419,550
2026-08-17$0.74$0.742,429,700$0.7524,640
2026-08-14$0.74$0.747,000,700$0.75179,497
2026-08-13$0.79$0.794,378,300$0.8692,618
2026-08-12$0.84$0.841,499,100$0.8428,873
2026-08-11$0.82$0.822,056,300$0.8028,531
2026-08-10$0.79$0.792,434,400$0.8410,189
2026-08-07$0.81$0.812,730,100$0.7718,745
2026-08-06$0.76$0.761,493,500$0.7727,975
2026-08-05$0.76$0.762,484,800$0.786,481
2026-08-04$0.77$0.773,986,300$0.7826,246
2026-08-03$0.75$0.752,706,300$0.7210,385
2026-07-31$0.71$0.711,840,500$0.7410,914
2026-07-30$0.72$0.723,550,000$0.7156,998
2026-07-29$0.70$0.704,102,800$0.7653,676
2026-07-28$0.76$0.763,267,400$0.7742,455
2026-07-27$0.78$0.781,086,500$0.793,734
2026-07-24$0.77$0.772,588,800$0.7916,656
2026-07-23$0.79$0.793,288,700$0.8078,576
2026-07-22$0.80$0.802,843,600$0.8219,673
2026-07-21$0.84$0.841,470,900$0.8326,515
2026-07-20$0.82$0.821,502,300$0.8346,643
2026-07-17$0.82$0.822,295,000
2026-07-16$0.82$0.823,743,400
2026-07-15$0.86$0.862,255,400
2026-07-14$0.87$0.871,213,200
2026-07-13$0.87$0.873,532,900
2026-07-10$0.88$0.882,906,600
2026-07-09$0.96$0.962,575,900
2026-07-08$0.91$0.913,422,600
2026-07-07$0.92$0.923,710,300
2026-07-06$0.95$0.952,626,600
2026-07-02$0.93$0.936,029,500
2026-07-01$0.92$0.925,506,500
2026-06-30$0.89$0.893,187,200
2026-06-29$0.89$0.893,989,700
2026-06-26$0.86$0.8618,909,700
2026-06-25$0.86$0.868,412,400
2026-06-24$0.83$0.835,134,200
2026-06-23$0.88$0.885,546,400
2026-06-22$0.92$0.925,934,900
2026-06-18$1.00$1.006,343,800
2026-06-17$0.94$0.943,473,100
2026-06-16$0.95$0.953,727,900
2026-06-15$0.99$0.999,422,200
2026-06-12$0.95$0.953,304,200
2026-06-11$0.97$0.973,444,700
2026-06-10$0.95$0.953,451,900
2026-06-09$0.99$0.998,116,900
2026-06-08$1.06$1.064,310,400
2026-06-05$1.05$1.058,905,000
2026-06-04$1.28$1.289,559,200
2026-06-03$1.19$1.197,952,200
2026-06-02$1.24$1.247,380,100
2026-06-01$1.18$1.187,407,300
2026-05-29$1.19$1.197,289,700
2026-05-28$1.20$1.207,411,600
2026-05-27$1.13$1.138,573,700
2026-05-26$1.08$1.087,550,900
2026-05-22$1.06$1.068,816,200
2026-05-21$0.99$0.9911,368,900
2026-05-20$0.88$0.884,706,200
2026-05-19$0.86$0.863,116,000
2026-05-18$0.85$0.854,577,500
2026-05-15$0.89$0.893,706,100
2026-05-14$0.93$0.934,436,200
2026-05-13$0.93$0.934,869,000
2026-05-12$0.95$0.9510,063,500
2026-05-11$0.92$0.925,786,600
2026-05-08$0.91$0.9113,192,900
2026-05-07$0.98$0.987,221,000
2026-05-06$1.03$1.038,075,300
2026-05-05$0.96$0.962,516,000
2026-05-04$0.97$0.972,873,500
2026-05-01$0.96$0.963,590,000
2026-04-30$0.98$0.9811,918,800
2026-04-29$0.87$0.873,449,600
2026-04-28$0.91$0.913,159,400
2026-04-27$0.90$0.903,118,000
2026-04-24$0.91$0.917,282,600
2026-04-23$0.94$0.947,311,000
2026-04-22$1.06$1.0611,054,700
2026-04-21$0.98$0.985,203,100
2026-04-20$1.01$1.017,820,600
2026-04-17$1.07$1.077,021,500
2026-04-16$1.04$1.047,641,500
2026-04-15$1.05$1.0517,707,500