NASDAQ:ALEC | Historical Stock Price | 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.

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Historical Stock Price — 2020

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2020-12-31$15.13$15.13517,900——
2020-12-30$15.28$15.28353,800——
2020-12-29$15.30$15.30440,000——
2020-12-28$15.47$15.47477,800——
2020-12-24$15.34$15.34209,300——
2020-12-23$16.34$16.34790,700——
2020-12-22$16.70$16.70831,700——
2020-12-21$15.86$15.86707,800——
2020-12-18$15.78$15.782,375,500——
2020-12-17$15.68$15.68636,900——
2020-12-16$14.86$14.86529,900——
2020-12-15$15.24$15.24523,100——
2020-12-14$15.08$15.08746,800——
2020-12-11$14.47$14.47414,600——
2020-12-10$15.04$15.04578,000——
2020-12-09$14.86$14.86679,800——
2020-12-08$15.23$15.23678,000——
2020-12-07$14.09$14.09645,600——
2020-12-04$14.55$14.55539,400——
2020-12-03$13.66$13.66523,600——
2020-12-02$13.87$13.87438,400——
2020-12-01$13.56$13.56723,400——
2020-11-30$13.11$13.11790,700——
2020-11-27$13.29$13.29259,800——
2020-11-25$13.29$13.29376,400——
2020-11-24$13.23$13.23805,100——
2020-11-23$13.07$13.07717,400——
2020-11-20$12.63$12.63382,000——
2020-11-19$12.35$12.35463,500——
2020-11-18$12.09$12.09756,300——
2020-11-17$13.08$13.08691,800——
2020-11-16$12.73$12.73707,700——
2020-11-13$12.87$12.87628,100——
2020-11-12$12.69$12.69702,100——
2020-11-11$12.06$12.06617,700——
2020-11-10$12.30$12.30802,800——
2020-11-09$12.01$12.01706,300——
2020-11-06$11.37$11.37657,600——
2020-11-05$11.44$11.44788,100——
2020-11-04$11.33$11.331,536,400——
2020-11-03$9.98$9.98527,400——
2020-11-02$9.66$9.66969,100——
2020-10-30$9.41$9.41527,500——
2020-10-29$9.53$9.531,072,500——
2020-10-28$9.71$9.71875,800——
2020-10-27$9.96$9.961,116,000——
2020-10-26$9.81$9.81860,300——
2020-10-23$9.49$9.49434,300——
2020-10-22$9.48$9.48614,700——
2020-10-21$9.41$9.41673,600——
2020-10-20$9.40$9.40816,200——
2020-10-19$9.69$9.69826,600——
2020-10-16$10.29$10.29821,900——
2020-10-15$9.69$9.691,212,200——
2020-10-14$10.02$10.02856,500——
2020-10-13$10.60$10.60905,100——
2020-10-12$10.50$10.501,064,500——
2020-10-09$10.12$10.12772,400——
2020-10-08$10.29$10.29725,000——
2020-10-07$10.53$10.53969,400——
2020-10-06$10.30$10.301,360,700——
2020-10-05$10.82$10.822,064,400——
2020-10-02$10.12$10.12987,700——
2020-10-01$10.24$10.241,594,300——
2020-09-30$10.54$10.541,380,700——
2020-09-29$10.80$10.801,023,200——
2020-09-28$10.99$10.991,016,600——
2020-09-25$11.29$11.29673,700——
2020-09-24$11.18$11.18800,000——
2020-09-23$11.22$11.22769,200——
2020-09-22$12.43$12.43678,300——
2020-09-21$12.49$12.49953,000——
2020-09-18$14.07$14.075,284,200——
2020-09-17$14.10$14.10559,500——
2020-09-16$14.14$14.14711,600——
2020-09-15$14.03$14.03580,200——
2020-09-14$13.70$13.70780,100——
2020-09-11$13.00$13.00399,400——
2020-09-10$12.57$12.57795,300——
2020-09-09$13.00$13.00448,300——
2020-09-08$12.48$12.48426,900——
2020-09-04$12.41$12.41729,000——
2020-09-03$12.66$12.66635,100——
2020-09-02$12.35$12.351,010,500——
2020-09-01$12.41$12.41553,000——
2020-08-31$12.92$12.92447,600——
2020-08-28$12.75$12.75303,800——
2020-08-27$12.68$12.68406,900——
2020-08-26$12.56$12.56461,500——
2020-08-25$13.26$13.26731,400——
2020-08-24$12.81$12.81611,200——
2020-08-21$12.34$12.34693,300——
2020-08-20$12.99$12.99595,100——
2020-08-19$13.00$13.00615,000——
2020-08-18$12.96$12.961,293,100——
2020-08-17$14.04$14.04869,200——
2020-08-14$13.45$13.451,169,300——
2020-08-13$13.70$13.70834,300——
2020-08-12$13.53$13.531,277,300——
2020-08-11$14.35$14.351,096,500——
2020-08-10$14.53$14.53699,600——
2020-08-07$14.85$14.851,186,100——
2020-08-06$15.16$15.161,071,800——
2020-08-05$14.57$14.571,257,100——
2020-08-04$15.02$15.02875,500——
2020-08-03$15.48$15.481,508,600——
2020-07-31$15.67$15.671,394,600——
2020-07-30$16.78$16.782,145,100——
2020-07-29$16.31$16.317,834,100——
2020-07-28$21.34$21.34788,500——
2020-07-27$23.37$23.37940,900——
2020-07-24$22.18$22.18505,400——
2020-07-23$22.29$22.29357,100——
2020-07-22$22.73$22.73554,500——
2020-07-21$21.38$21.38830,100——
2020-07-20$23.71$23.71584,900——
2020-07-17$23.51$23.51578,200——
2020-07-16$22.55$22.55691,600——
2020-07-15$22.80$22.80863,400——
2020-07-14$22.50$22.50581,200——
2020-07-13$22.55$22.55381,100——
2020-07-10$23.30$23.30342,500——
2020-07-09$24.05$24.05487,400——
2020-07-08$24.29$24.29433,400——
2020-07-07$23.51$23.51502,300——
2020-07-06$22.78$22.781,094,300——
2020-07-02$23.81$23.81348,800——
2020-07-01$24.96$24.96655,200——
2020-06-30$24.44$24.441,065,300——
2020-06-29$23.50$23.50731,300——
2020-06-26$24.29$24.292,852,500——
2020-06-25$28.27$28.27792,000——
2020-06-24$29.41$29.41621,100——
2020-06-23$31.02$31.021,042,900——
2020-06-22$30.20$30.20568,000——
2020-06-19$30.58$30.581,561,000——
2020-06-18$31.12$31.12382,600——
2020-06-17$31.90$31.90601,000——
2020-06-16$30.25$30.25885,000——
2020-06-15$29.75$29.75855,800——
2020-06-12$29.28$29.28401,600——
2020-06-11$29.05$29.05433,700——
2020-06-10$31.18$31.18322,200——
2020-06-09$31.07$31.07444,900——
2020-06-08$30.88$30.88344,300——
2020-06-05$29.99$29.99405,000——
2020-06-04$30.31$30.31361,800——
2020-06-03$30.56$30.56463,400——
2020-06-02$32.90$32.90566,900——
2020-06-01$33.11$33.11569,200——
2020-05-29$32.70$32.70966,700——
2020-05-28$31.47$31.47510,500——
2020-05-27$32.74$32.74566,800——
2020-05-26$31.64$31.64612,900——
2020-05-22$33.10$33.10493,400——
2020-05-21$31.61$31.61559,200——
2020-05-20$30.60$30.60331,400——
2020-05-19$28.81$28.81336,900——
2020-05-18$28.33$28.33384,900——
2020-05-15$27.70$27.70556,800——
2020-05-14$26.84$26.84725,700——
2020-05-13$30.07$30.07648,500——
2020-05-12$28.24$28.24391,500——
2020-05-11$29.09$29.09287,500——
2020-05-08$27.24$27.24231,600——
2020-05-07$27.44$27.44254,900——
2020-05-06$27.02$27.02361,300——
2020-05-05$28.08$28.08508,300——
2020-05-04$25.66$25.66268,400——
2020-05-01$24.18$24.18295,700——
2020-04-30$24.72$24.72440,600——
2020-04-29$28.14$28.14333,000——
2020-04-28$25.84$25.84292,300——
2020-04-27$26.40$26.40262,500——
2020-04-24$25.32$25.32424,100——
2020-04-23$24.01$24.01310,600——
2020-04-22$24.87$24.87338,900——
2020-04-21$23.92$23.92199,700——
2020-04-20$25.12$25.12382,200——
2020-04-17$24.28$24.28444,200——
2020-04-16$22.49$22.49769,200——
2020-04-15$22.26$22.26354,000——
2020-04-14$23.49$23.49477,100——
2020-04-13$23.01$23.01305,700——
2020-04-09$23.30$23.30850,400——
2020-04-08$23.37$23.37641,500——
2020-04-07$22.90$22.90465,900——
2020-04-06$23.43$23.43448,400——
2020-04-03$21.90$21.90317,300——
2020-04-02$22.75$22.75389,900——
2020-04-01$21.87$21.87466,000——
2020-03-31$24.13$24.13798,200——
2020-03-30$24.50$24.50347,600——
2020-03-27$22.76$22.76400,900——
2020-03-26$24.75$24.75504,600——
2020-03-25$23.45$23.45519,900——
2020-03-24$24.40$24.40389,200——
2020-03-23$23.81$23.81510,600——
2020-03-20$29.31$29.311,453,200——
2020-03-19$27.89$27.89685,500——
2020-03-18$25.04$25.04947,600——
2020-03-17$28.18$28.18691,200——
2020-03-16$23.18$23.18674,500——
2020-03-13$24.73$24.73653,100——
2020-03-12$21.09$21.09594,100——
2020-03-11$24.92$24.92452,900——
2020-03-10$27.02$27.02308,700——
2020-03-09$26.13$26.13388,900——
2020-03-06$29.10$29.10425,400——
2020-03-05$29.45$29.45539,400——
2020-03-04$31.34$31.34751,200——
2020-03-03$28.20$28.20495,500——
2020-03-02$28.41$28.41604,500——
2020-02-28$27.48$27.48950,400——
2020-02-27$25.90$25.90984,900——
2020-02-26$27.41$27.41427,400——
2020-02-25$27.39$27.39396,100——
2020-02-24$27.35$27.35988,000——
2020-02-21$30.47$30.47356,400——
2020-02-20$29.88$29.88481,000——
2020-02-19$29.86$29.86578,600——
2020-02-18$28.99$28.99562,100——
2020-02-14$30.00$30.00510,500——
2020-02-13$29.52$29.52496,300——
2020-02-12$30.26$30.26433,800——
2020-02-11$30.00$30.00971,500——
2020-02-10$29.26$29.261,811,400——
2020-02-07$35.28$35.281,527,200——
2020-02-06$34.47$34.47739,900——
2020-02-05$33.71$33.711,143,700——
2020-02-04$30.18$30.181,287,000——
2020-02-03$28.19$28.19611,500——
2020-01-31$27.94$27.94833,800——
2020-01-30$28.17$28.173,526,100——
2020-01-29$25.94$25.94697,400——
2020-01-28$24.59$24.59690,700——
2020-01-27$25.73$25.73914,800——
2020-01-24$24.55$24.55662,100——
2020-01-23$23.28$23.28988,200——
2020-01-22$22.93$22.93412,100——
2020-01-21$21.99$21.99339,300——
2020-01-17$21.38$21.38568,400——
2020-01-16$19.89$19.89328,700——
2020-01-15$18.91$18.91383,500——
2020-01-14$18.44$18.44301,800——
2020-01-13$17.72$17.72328,200——
2020-01-10$18.53$18.53246,200——
2020-01-09$18.90$18.90827,000——
2020-01-08$18.22$18.22246,900——
2020-01-07$16.57$16.57228,500——
2020-01-06$16.42$16.42210,700——
2020-01-03$16.25$16.25242,900——
2020-01-02$16.58$16.58194,200——