NASDAQ:ALEC | Stock Price History | Alector, 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
2019-02-07 to 2026-09-04
Data captured

Stock Price Chart

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

$0.86$1.86$4.03$8.75$18.96$41.092019-02-072026-08-27

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$2.5949,162
2026-09-03$2.74290,515
2026-09-02$2.45194,965
2026-09-01$2.2330,949
2026-08-31$2.3442,497
2026-08-28$2.3834,456
2026-08-27$2.39$2.39706,900$2.4086,960
2026-08-26$2.46$2.46995,500$2.3887,952
2026-08-25$2.36$2.36557,300$2.3436,656
2026-08-24$2.30$2.30738,100$2.3751,317
2026-08-21$2.36$2.36728,100$2.2179,403
2026-08-20$2.26$2.26662,200$2.4956,531
2026-08-19$2.43$2.433,755,600$2.26147,786
2026-08-18$2.21$2.214,774,000$2.0869,932
2026-08-17$2.05$2.05913,800$1.9790,864
2026-08-14$1.96$1.96649,000$2.0173,597
2026-08-13$2.04$2.041,294,800$2.12106,024
2026-08-12$2.15$2.15786,200$2.0545,348
2026-08-11$2.09$2.095,543,300$1.67362,414
2026-08-10$1.69$1.69805,600$1.7637,178
2026-08-07$1.78$1.781,247,000$1.8385,470
2026-08-06$1.83$1.835,704,400$1.49451,409
2026-08-05$1.49$1.49392,300$1.5636,817
2026-08-04$1.54$1.54407,200$1.5631,889
2026-08-03$1.51$1.51359,900$1.4740,349
2026-07-31$1.51$1.51548,300$1.6169,443
2026-07-30$1.62$1.62453,200$1.5231,003
2026-07-29$1.52$1.52307,900$1.5124,762
2026-07-28$1.52$1.52342,800$1.5136,865
2026-07-27$1.51$1.51229,000$1.5121,675
2026-07-24$1.48$1.48325,300$1.4629,173
2026-07-23$1.49$1.49607,100$1.5358,741
2026-07-22$1.53$1.53333,300$1.5435,208
2026-07-21$1.54$1.54499,600$1.4539,358
2026-07-20$1.43$1.43463,900$1.4854,546
2026-07-17$1.50$1.50500,200
2026-07-16$1.47$1.47713,500
2026-07-15$1.50$1.50719,600
2026-07-14$1.39$1.39529,700
2026-07-13$1.51$1.51775,700
2026-07-10$1.61$1.61597,200
2026-07-09$1.64$1.64589,200
2026-07-08$1.83$1.83643,800
2026-07-07$1.93$1.93416,200
2026-07-06$1.94$1.94588,500
2026-07-02$2.06$2.06394,000
2026-07-01$2.01$2.01368,500
2026-06-30$2.01$2.01609,400
2026-06-29$2.08$2.08544,200
2026-06-26$1.86$1.863,845,400
2026-06-25$1.85$1.852,828,200
2026-06-24$1.79$1.79510,400
2026-06-23$1.83$1.83854,000
2026-06-22$1.78$1.781,592,800
2026-06-18$1.75$1.751,108,400
2026-06-17$1.56$1.56496,000
2026-06-16$1.54$1.54712,000
2026-06-15$1.48$1.48629,600
2026-06-12$1.53$1.53263,800
2026-06-11$1.57$1.57428,200
2026-06-10$1.52$1.52428,800
2026-06-09$1.63$1.63439,500
2026-06-08$1.64$1.64667,800
2026-06-05$1.64$1.64364,300
2026-06-04$1.81$1.81449,400
2026-06-03$1.78$1.781,691,700
2026-06-02$1.95$1.951,561,000
2026-06-01$2.07$2.07705,800
2026-05-29$2.16$2.16993,200
2026-05-28$2.15$2.151,300,400
2026-05-27$2.21$2.21462,400
2026-05-26$2.19$2.19480,600
2026-05-22$2.21$2.21328,100
2026-05-21$2.21$2.21929,700
2026-05-20$2.12$2.12898,500
2026-05-19$2.11$2.11790,400
2026-05-18$2.12$2.12814,500
2026-05-15$2.16$2.161,104,600
2026-05-14$2.30$2.30783,200
2026-05-13$2.15$2.15459,100
2026-05-12$2.16$2.16437,300
2026-05-11$2.05$2.05389,100
2026-05-08$2.10$2.10720,500
2026-05-07$2.44$2.44276,500
2026-05-06$2.57$2.57470,600
2026-05-05$2.57$2.57361,200
2026-05-04$2.51$2.51447,500
2026-05-01$2.36$2.36420,300
2026-04-30$2.37$2.37713,200
2026-04-29$2.30$2.30369,000
2026-04-28$2.39$2.39297,100
2026-04-27$2.35$2.35592,900
2026-04-24$2.41$2.41320,600
2026-04-23$2.43$2.43303,400
2026-04-22$2.45$2.451,421,400
2026-04-21$2.46$2.46298,700
2026-04-20$2.71$2.71324,900
2026-04-17$2.57$2.57343,100
2026-04-16$2.55$2.55561,000
2026-04-15$2.58$2.58538,400