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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$1.10$1.105,902,300
2025-12-30$1.11$1.117,955,400
2025-12-29$1.18$1.188,021,500
2025-12-26$1.23$1.234,175,400
2025-12-24$1.31$1.314,344,500
2025-12-23$1.23$1.234,209,400
2025-12-22$1.27$1.275,156,100
2025-12-19$1.27$1.276,700,100
2025-12-18$1.22$1.223,418,900
2025-12-17$1.20$1.203,827,000
2025-12-16$1.22$1.224,898,600
2025-12-15$1.23$1.234,129,100
2025-12-12$1.29$1.295,641,000
2025-12-11$1.40$1.404,342,000
2025-12-10$1.44$1.443,567,300
2025-12-09$1.42$1.423,710,400
2025-12-08$1.45$1.453,171,000
2025-12-05$1.44$1.443,673,300
2025-12-04$1.47$1.475,885,600
2025-12-03$1.36$1.364,068,900
2025-12-02$1.27$1.273,326,900
2025-12-01$1.29$1.293,490,400
2025-11-28$1.41$1.412,455,600
2025-11-26$1.35$1.354,590,900
2025-11-25$1.35$1.353,544,900
2025-11-24$1.35$1.354,734,000
2025-11-21$1.27$1.275,215,900
2025-11-20$1.24$1.246,779,600
2025-11-19$1.28$1.285,939,800
2025-11-18$1.27$1.275,006,800
2025-11-17$1.30$1.304,656,800
2025-11-14$1.37$1.377,297,900
2025-11-13$1.39$1.397,063,600
2025-11-12$1.52$1.525,462,100
2025-11-11$1.58$1.584,498,600
2025-11-10$1.60$1.605,590,400
2025-11-07$1.58$1.589,690,600
2025-11-06$1.65$1.659,785,100
2025-11-05$1.80$1.808,577,200
2025-11-04$1.84$1.847,175,500
2025-11-03$2.00$2.009,521,700
2025-10-31$2.15$2.156,172,900
2025-10-30$2.03$2.036,739,700
2025-10-29$2.14$2.147,171,300
2025-10-28$2.18$2.189,163,700
2025-10-27$2.34$2.3410,282,700
2025-10-24$2.29$2.2911,745,600
2025-10-23$2.20$2.2012,164,800
2025-10-22$2.20$2.2018,410,400
2025-10-21$2.34$2.3415,333,700
2025-10-20$2.59$2.5922,176,500
2025-10-17$2.28$2.2820,988,700
2025-10-16$2.54$2.5449,550,500
2025-10-15$2.63$2.6353,572,300
2025-10-14$2.15$2.1523,794,600
2025-10-13$2.08$2.0833,370,600
2025-10-10$1.67$1.6721,776,900
2025-10-09$1.74$1.746,852,600
2025-10-08$1.77$1.778,810,700
2025-10-07$1.77$1.7718,189,400
2025-10-06$1.81$1.8117,235,700
2025-10-03$1.72$1.7219,291,700
2025-10-02$1.54$1.548,024,400
2025-10-01$1.46$1.465,506,600
2025-09-30$1.41$1.415,733,700
2025-09-29$1.39$1.399,550,000
2025-09-26$1.49$1.497,793,700
2025-09-25$1.51$1.5110,700,600
2025-09-24$1.61$1.6113,282,700
2025-09-23$1.60$1.6021,284,400
2025-09-22$1.70$1.7024,913,400
2025-09-19$1.50$1.5023,200,200
2025-09-18$1.53$1.5337,180,100
2025-09-17$1.26$1.2610,309,300
2025-09-16$1.33$1.337,290,700
2025-09-15$1.26$1.268,873,000
2025-09-12$1.18$1.186,110,600
2025-09-11$1.20$1.207,399,200
2025-09-10$1.12$1.124,230,900
2025-09-09$1.15$1.153,994,100
2025-09-08$1.06$1.064,089,700
2025-09-05$1.08$1.083,433,300
2025-09-04$1.07$1.073,698,800
2025-09-03$1.07$1.073,838,600
2025-09-02$1.08$1.084,078,700
2025-08-29$1.12$1.123,471,800
2025-08-28$1.15$1.154,261,900
2025-08-27$1.16$1.165,191,500
2025-08-26$1.17$1.173,624,400
2025-08-25$1.14$1.143,877,400
2025-08-22$1.14$1.146,872,500
2025-08-21$1.11$1.119,296,900
2025-08-20$1.00$1.0011,048,300
2025-08-19$1.03$1.037,997,600
2025-08-18$1.09$1.094,931,100
2025-08-15$1.10$1.105,863,600
2025-08-14$1.12$1.129,810,800
2025-08-13$1.17$1.177,961,100
2025-08-12$1.16$1.169,815,400
2025-08-11$1.20$1.208,681,800
2025-08-08$1.27$1.276,536,100
2025-08-07$1.33$1.334,185,200
2025-08-06$1.37$1.378,481,600
2025-08-05$1.44$1.447,832,900
2025-08-04$1.44$1.444,385,100
2025-08-01$1.46$1.464,434,700
2025-07-31$1.48$1.4811,156,600
2025-07-30$1.62$1.624,441,700
2025-07-29$1.64$1.649,424,000
2025-07-28$1.79$1.796,785,400
2025-07-25$1.93$1.937,424,700
2025-07-24$1.98$1.9810,677,500
2025-07-23$1.88$1.888,536,900
2025-07-22$1.80$1.805,848,800
2025-07-21$1.72$1.725,667,900
2025-07-18$1.76$1.766,449,300
2025-07-17$1.82$1.826,462,200
2025-07-16$1.80$1.806,873,200
2025-07-15$1.72$1.725,424,600
2025-07-14$1.73$1.735,900,900
2025-07-11$1.73$1.736,159,700
2025-07-10$1.81$1.815,751,000
2025-07-09$1.87$1.878,557,500
2025-07-08$1.81$1.819,999,500
2025-07-07$1.83$1.8316,643,800
2025-07-03$2.14$2.1412,849,700
2025-07-02$1.98$1.985,715,500
2025-07-01$1.90$1.906,051,500
2025-06-30$1.96$1.967,019,400
2025-06-27$1.95$1.9512,397,300
2025-06-26$2.05$2.057,975,600
2025-06-25$2.02$2.0223,326,100
2025-06-24$1.88$1.889,862,000
2025-06-23$1.65$1.657,976,900
2025-06-20$1.73$1.737,210,600
2025-06-18$1.75$1.755,651,700
2025-06-17$1.68$1.684,848,100
2025-06-16$1.77$1.775,344,900
2025-06-13$1.66$1.668,253,200
2025-06-12$1.79$1.799,407,300
2025-06-11$1.76$1.7611,329,400
2025-06-10$1.70$1.705,490,500
2025-06-09$1.71$1.713,885,000
2025-06-06$1.74$1.745,684,300
2025-06-05$1.60$1.607,304,000
2025-06-04$1.75$1.754,858,500
2025-06-03$1.76$1.766,703,400
2025-06-02$1.68$1.685,404,200
2025-05-30$1.68$1.687,603,600
2025-05-29$1.71$1.717,299,000
2025-05-28$1.78$1.7812,118,200
2025-05-27$1.92$1.9220,661,500
2025-05-23$1.94$1.9431,648,900
2025-05-22$1.74$1.7426,010,400
2025-05-21$1.48$1.4821,250,200
2025-05-20$1.68$1.6825,873,000
2025-05-19$1.41$1.415,388,100
2025-05-16$1.48$1.488,666,300
2025-05-15$1.48$1.488,985,700
2025-05-14$1.52$1.529,437,400
2025-05-13$1.46$1.467,132,400
2025-05-12$1.51$1.519,603,000
2025-05-09$1.26$1.263,631,200
2025-05-08$1.33$1.336,283,600
2025-05-07$1.20$1.202,314,600
2025-05-06$1.19$1.191,894,500
2025-05-05$1.20$1.203,016,700
2025-05-02$1.26$1.264,454,700
2025-05-01$1.16$1.162,124,400
2025-04-30$1.14$1.142,910,400
2025-04-29$1.18$1.182,572,500
2025-04-28$1.21$1.212,643,800
2025-04-25$1.23$1.233,244,400
2025-04-24$1.22$1.222,835,700
2025-04-23$1.17$1.173,402,700
2025-04-22$1.13$1.131,901,200
2025-04-21$1.09$1.091,734,100
2025-04-17$1.15$1.151,637,100
2025-04-16$1.16$1.162,156,700
2025-04-15$1.23$1.231,764,300
2025-04-14$1.23$1.233,105,600
2025-04-11$1.25$1.252,269,800
2025-04-10$1.17$1.172,978,400
2025-04-09$1.23$1.235,616,600
2025-04-08$1.08$1.084,498,000
2025-04-07$1.14$1.144,244,000
2025-04-04$1.13$1.134,919,300
2025-04-03$1.16$1.163,308,800
2025-04-02$1.23$1.232,954,800
2025-04-01$1.20$1.203,263,400
2025-03-31$1.20$1.204,173,100
2025-03-28$1.27$1.273,198,900
2025-03-27$1.31$1.313,924,200
2025-03-26$1.39$1.394,010,700
2025-03-25$1.41$1.414,686,500
2025-03-24$1.48$1.487,421,000
2025-03-21$1.46$1.468,654,400
2025-03-20$1.41$1.418,560,000
2025-03-19$1.56$1.567,681,400
2025-03-18$1.59$1.5916,800,400
2025-03-17$1.65$1.6546,898,900
2025-03-14$1.36$1.3620,614,100
2025-03-13$1.14$1.143,527,000
2025-03-12$1.20$1.203,962,600
2025-03-11$1.18$1.184,061,700
2025-03-10$1.18$1.185,671,800
2025-03-07$1.29$1.293,071,200
2025-03-06$1.29$1.295,389,900
2025-03-05$1.40$1.403,686,500
2025-03-04$1.38$1.3810,584,500
2025-03-03$1.30$1.308,834,100
2025-02-28$1.38$1.386,738,900
2025-02-27$1.35$1.356,371,900
2025-02-26$1.49$1.494,750,900
2025-02-25$1.46$1.469,295,900
2025-02-24$1.62$1.626,964,500
2025-02-21$1.71$1.718,818,000
2025-02-20$1.89$1.896,703,200
2025-02-19$1.91$1.9111,346,400
2025-02-18$1.92$1.928,860,700
2025-02-14$1.95$1.956,505,100
2025-02-13$2.03$2.037,578,500
2025-02-12$1.96$1.967,039,700
2025-02-11$1.92$1.928,568,800
2025-02-10$2.00$2.0011,699,700
2025-02-07$2.04$2.0423,781,800
2025-02-06$1.90$1.9010,655,100
2025-02-05$1.90$1.909,213,800
2025-02-04$1.93$1.936,538,200
2025-02-03$1.82$1.828,524,500
2025-01-31$1.98$1.9812,371,300
2025-01-30$1.96$1.967,813,900
2025-01-29$2.04$2.049,600,600
2025-01-28$2.08$2.089,263,600
2025-01-27$2.21$2.2111,314,900
2025-01-24$2.30$2.3015,433,000
2025-01-23$2.41$2.4110,773,800
2025-01-22$2.38$2.3815,821,000
2025-01-21$2.44$2.4420,441,000
2025-01-17$2.24$2.2423,292,800
2025-01-16$2.54$2.5438,384,500
2025-01-15$2.35$2.3547,847,700
2025-01-14$2.03$2.0333,151,000
2025-01-13$1.93$1.9332,634,200
2025-01-10$2.65$2.6531,970,200
2025-01-08$2.64$2.6450,559,500
2025-01-07$3.50$3.5035,527,400
2025-01-06$4.10$4.1062,943,100
2025-01-03$4.29$4.29198,520,000
2025-01-02$4.26$4.26104,616,600