NASDAQ:QSI | Historical Stock Price | 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.

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Historical Stock Price — 2026

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
2026-04-14$0.84$0.843,070,600
2026-04-13$0.79$0.792,650,500
2026-04-10$0.74$0.741,881,900
2026-04-09$0.75$0.752,638,600
2026-04-08$0.75$0.753,189,000
2026-04-07$0.71$0.713,515,300
2026-04-06$0.73$0.731,890,500
2026-04-02$0.75$0.752,571,800
2026-04-01$0.75$0.752,354,500
2026-03-31$0.77$0.772,872,500
2026-03-30$0.74$0.743,758,200
2026-03-27$0.76$0.763,169,700
2026-03-26$0.81$0.812,619,300
2026-03-25$0.87$0.872,549,900
2026-03-24$0.85$0.852,660,300
2026-03-23$0.90$0.904,568,800
2026-03-20$0.85$0.853,813,300
2026-03-19$0.86$0.862,419,100
2026-03-18$0.88$0.883,158,800
2026-03-17$0.93$0.932,787,300
2026-03-16$0.94$0.942,701,800
2026-03-13$0.95$0.952,835,000
2026-03-12$0.98$0.983,977,800
2026-03-11$1.05$1.053,613,600
2026-03-10$1.04$1.048,474,600
2026-03-09$0.93$0.934,955,000
2026-03-06$0.86$0.865,636,900
2026-03-05$0.91$0.914,219,500
2026-03-04$0.91$0.912,970,500
2026-03-03$0.95$0.953,196,900
2026-03-02$0.93$0.931,840,200
2026-02-27$0.96$0.962,595,500
2026-02-26$1.01$1.012,267,900
2026-02-25$0.99$0.993,162,900
2026-02-24$0.93$0.931,370,200
2026-02-23$0.91$0.911,888,700
2026-02-20$0.94$0.941,754,700
2026-02-19$0.96$0.963,993,500
2026-02-18$0.91$0.914,913,400
2026-02-17$0.94$0.943,547,300
2026-02-13$0.99$0.993,127,800
2026-02-12$0.98$0.985,890,700
2026-02-11$1.04$1.044,049,000
2026-02-10$1.10$1.103,669,800
2026-02-09$1.07$1.073,148,000
2026-02-06$1.07$1.077,481,600
2026-02-05$0.93$0.938,157,500
2026-02-04$1.03$1.036,372,600
2026-02-03$1.09$1.095,044,800
2026-02-02$1.10$1.103,772,000
2026-01-30$1.13$1.135,467,500
2026-01-29$1.17$1.176,195,600
2026-01-28$1.20$1.203,995,900
2026-01-27$1.23$1.232,862,500
2026-01-26$1.21$1.213,159,300
2026-01-23$1.25$1.254,115,600
2026-01-22$1.31$1.316,410,600
2026-01-21$1.23$1.234,912,100
2026-01-20$1.19$1.195,735,200
2026-01-16$1.27$1.275,462,700
2026-01-15$1.23$1.233,687,400
2026-01-14$1.27$1.274,428,100
2026-01-13$1.27$1.275,767,900
2026-01-12$1.21$1.214,925,400
2026-01-09$1.22$1.224,460,500
2026-01-08$1.25$1.254,893,100
2026-01-07$1.26$1.264,107,800
2026-01-06$1.28$1.287,655,000
2026-01-05$1.26$1.268,340,500
2026-01-02$1.16$1.164,871,600