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.

View year

Historical Stock Price — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2021-12-31$20.65$20.65445,200
2021-12-30$20.92$20.92495,000
2021-12-29$21.27$21.27364,900
2021-12-28$21.84$21.84418,200
2021-12-27$22.62$22.62448,900
2021-12-23$23.72$23.72384,700
2021-12-22$23.13$23.13490,800
2021-12-21$23.28$23.28362,200
2021-12-20$23.34$23.34480,300
2021-12-17$22.83$22.832,418,100
2021-12-16$21.75$21.75541,800
2021-12-15$22.66$22.66784,100
2021-12-14$21.06$21.06448,800
2021-12-13$21.50$21.50545,800
2021-12-10$21.57$21.57565,600
2021-12-09$22.43$22.43589,900
2021-12-08$22.93$22.93698,100
2021-12-07$21.94$21.94575,600
2021-12-06$19.83$19.83506,900
2021-12-03$19.45$19.453,897,700
2021-12-02$20.65$20.65519,800
2021-12-01$20.09$20.09562,900
2021-11-30$20.65$20.65705,300
2021-11-29$19.35$19.35533,900
2021-11-26$19.92$19.92393,300
2021-11-24$21.28$21.28339,700
2021-11-23$21.16$21.16521,500
2021-11-22$20.64$20.64421,400
2021-11-19$21.39$21.39356,200
2021-11-18$22.04$22.04430,700
2021-11-17$22.22$22.22422,900
2021-11-16$21.89$21.89372,800
2021-11-15$21.91$21.91701,000
2021-11-12$23.18$23.18445,100
2021-11-11$22.64$22.64495,700
2021-11-10$24.83$24.83616,400
2021-11-09$25.54$25.54851,000
2021-11-08$24.86$24.86525,700
2021-11-05$25.10$25.10934,100
2021-11-04$24.91$24.91742,700
2021-11-03$24.53$24.53428,200
2021-11-02$23.50$23.50408,700
2021-11-01$22.35$22.35471,600
2021-10-29$21.74$21.74424,800
2021-10-28$22.15$22.15522,100
2021-10-27$21.61$21.61549,000
2021-10-26$23.41$23.41276,800
2021-10-25$23.14$23.14212,400
2021-10-22$23.61$23.61326,600
2021-10-21$23.73$23.73623,400
2021-10-20$22.52$22.52195,700
2021-10-19$22.81$22.81229,000
2021-10-18$23.35$23.35286,300
2021-10-15$23.30$23.30355,200
2021-10-14$24.47$24.47309,900
2021-10-13$24.22$24.22273,000
2021-10-12$23.93$23.93207,700
2021-10-11$23.76$23.76262,900
2021-10-08$23.40$23.40217,200
2021-10-07$24.28$24.28513,000
2021-10-06$23.74$23.74360,500
2021-10-05$23.89$23.89422,000
2021-10-04$22.87$22.87543,500
2021-10-01$23.70$23.70424,500
2021-09-30$22.82$22.82640,800
2021-09-29$23.48$23.48560,300
2021-09-28$23.44$23.44389,500
2021-09-27$23.99$23.99585,000
2021-09-24$23.60$23.60556,400
2021-09-23$24.26$24.26662,500
2021-09-22$25.00$25.00621,500
2021-09-21$26.17$26.17527,300
2021-09-20$25.77$25.77748,900
2021-09-17$26.81$26.811,410,900
2021-09-16$25.46$25.46461,900
2021-09-15$24.26$24.26519,700
2021-09-14$23.76$23.76522,700
2021-09-13$23.77$23.77897,800
2021-09-10$22.76$22.76697,000
2021-09-09$22.42$22.422,048,000
2021-09-08$21.65$21.653,620,800
2021-09-07$26.72$26.72711,000
2021-09-03$26.64$26.64578,200
2021-09-02$27.89$27.891,047,400
2021-09-01$27.17$27.17632,100
2021-08-31$27.03$27.03834,200
2021-08-30$26.27$26.27440,100
2021-08-27$27.21$27.21678,900
2021-08-26$26.04$26.04305,600
2021-08-25$26.37$26.37304,400
2021-08-24$26.43$26.43394,900
2021-08-23$26.17$26.17615,400
2021-08-20$24.51$24.51520,300
2021-08-19$24.80$24.80490,600
2021-08-18$25.97$25.97474,400
2021-08-17$27.13$27.13799,000
2021-08-16$27.48$27.48473,300
2021-08-13$28.32$28.32507,800
2021-08-12$27.91$27.91498,000
2021-08-11$27.46$27.46479,500
2021-08-10$26.80$26.80492,100
2021-08-09$26.83$26.83563,100
2021-08-06$27.62$27.62621,200
2021-08-05$28.59$28.59982,400
2021-08-04$27.74$27.74949,100
2021-08-03$25.79$25.79945,500
2021-08-02$25.34$25.34998,500
2021-07-30$24.04$24.041,316,700
2021-07-29$24.07$24.072,787,200
2021-07-28$30.50$30.50872,100
2021-07-27$29.94$29.94932,600
2021-07-26$30.43$30.431,414,300
2021-07-23$32.77$32.77708,900
2021-07-22$31.76$31.761,495,200
2021-07-21$30.28$30.281,756,700
2021-07-20$32.54$32.54712,600
2021-07-19$31.30$31.301,163,500
2021-07-16$33.11$33.11769,100
2021-07-15$33.40$33.401,145,400
2021-07-14$36.27$36.27975,800
2021-07-13$37.31$37.31659,100
2021-07-12$36.59$36.59710,100
2021-07-09$36.91$36.911,419,900
2021-07-08$39.13$39.131,490,800
2021-07-07$39.49$39.492,685,100
2021-07-06$39.44$39.447,285,400
2021-07-02$35.21$35.2139,111,100
2021-07-01$22.41$22.41411,600
2021-06-30$20.83$20.83390,400
2021-06-29$20.62$20.62264,000
2021-06-28$20.94$20.94280,100
2021-06-25$21.27$21.271,725,300
2021-06-24$21.00$21.00486,300
2021-06-23$20.86$20.86534,000
2021-06-22$21.30$21.30499,100
2021-06-21$22.15$22.15508,400
2021-06-18$21.23$21.231,127,600
2021-06-17$21.37$21.37527,500
2021-06-16$22.43$22.431,793,000
2021-06-15$22.48$22.48930,100
2021-06-14$21.19$21.19610,400
2021-06-11$19.62$19.62413,800
2021-06-10$19.41$19.41390,100
2021-06-09$19.38$19.38479,000
2021-06-08$18.97$18.97746,600
2021-06-07$21.03$21.031,113,600
2021-06-04$19.54$19.54415,600
2021-06-03$19.57$19.57503,100
2021-06-02$18.21$18.21923,000
2021-06-01$17.94$17.94557,100
2021-05-28$17.80$17.80324,900
2021-05-27$18.13$18.13487,000
2021-05-26$18.02$18.02308,200
2021-05-25$17.62$17.62346,400
2021-05-24$17.69$17.69266,800
2021-05-21$18.14$18.14312,200
2021-05-20$17.27$17.27370,500
2021-05-19$17.44$17.44360,000
2021-05-18$17.61$17.61403,200
2021-05-17$17.46$17.46405,300
2021-05-14$17.00$17.00496,900
2021-05-13$15.50$15.50923,500
2021-05-12$16.79$16.79616,600
2021-05-11$16.72$16.72516,200
2021-05-10$16.12$16.12475,100
2021-05-07$16.35$16.35800,400
2021-05-06$16.97$16.97450,000
2021-05-05$15.71$15.71642,100
2021-05-04$18.41$18.411,377,100
2021-05-03$18.88$18.88462,700
2021-04-30$19.50$19.50423,800
2021-04-29$19.22$19.22305,300
2021-04-28$18.87$18.87289,500
2021-04-27$18.46$18.46290,400
2021-04-26$19.47$19.471,119,300
2021-04-23$18.76$18.76354,700
2021-04-22$18.90$18.90531,700
2021-04-21$18.11$18.11347,300
2021-04-20$18.00$18.00504,100
2021-04-19$17.85$17.85445,200
2021-04-16$17.80$17.80757,200
2021-04-15$18.48$18.48528,500
2021-04-14$17.57$17.57478,400
2021-04-13$17.53$17.53615,200
2021-04-12$16.80$16.80484,900
2021-04-09$17.37$17.37972,700
2021-04-08$19.63$19.63630,100
2021-04-07$19.24$19.24496,900
2021-04-06$19.54$19.54499,000
2021-04-05$19.75$19.75668,600
2021-04-01$20.00$20.00732,800
2021-03-31$20.14$20.14928,400
2021-03-30$17.52$17.52645,100
2021-03-29$17.07$17.07924,100
2021-03-26$16.35$16.35644,600
2021-03-25$15.89$15.891,440,400
2021-03-24$17.02$17.021,078,400
2021-03-23$19.78$19.781,001,800
2021-03-22$22.23$22.231,406,100
2021-03-19$21.02$21.022,876,900
2021-03-18$17.94$17.94391,900
2021-03-17$18.71$18.71312,700
2021-03-16$18.41$18.41413,600
2021-03-15$18.66$18.66442,600
2021-03-12$19.03$19.03407,400
2021-03-11$19.05$19.05575,000
2021-03-10$17.50$17.50372,600
2021-03-09$18.13$18.13954,900
2021-03-08$17.05$17.05637,400
2021-03-05$17.07$17.071,039,100
2021-03-04$16.25$16.25768,000
2021-03-03$16.41$16.41396,800
2021-03-02$17.03$17.03696,200
2021-03-01$17.43$17.43412,400
2021-02-26$18.18$18.18442,700
2021-02-25$17.75$17.75569,200
2021-02-24$19.08$19.08613,800
2021-02-23$17.35$17.35648,700
2021-02-22$17.21$17.21425,800
2021-02-19$17.69$17.69671,300
2021-02-18$17.48$17.48704,500
2021-02-17$20.85$20.85690,600
2021-02-16$21.00$21.00698,900
2021-02-12$21.05$21.05532,600
2021-02-11$20.54$20.54496,900
2021-02-10$20.50$20.50420,000
2021-02-09$20.80$20.80399,200
2021-02-08$21.08$21.08799,700
2021-02-05$20.76$20.76526,900
2021-02-04$20.38$20.38720,100
2021-02-03$19.33$19.33566,300
2021-02-02$19.51$19.51730,900
2021-02-01$18.00$18.00538,100
2021-01-29$16.84$16.84449,900
2021-01-28$16.77$16.77340,700
2021-01-27$17.21$17.21558,700
2021-01-26$17.50$17.50383,000
2021-01-25$18.15$18.15600,900
2021-01-22$16.59$16.59487,800
2021-01-21$16.21$16.21655,700
2021-01-20$17.44$17.44400,500
2021-01-19$17.93$17.93979,200
2021-01-15$16.87$16.87795,300
2021-01-14$15.54$15.54322,300
2021-01-13$15.29$15.29284,900
2021-01-12$15.59$15.59290,900
2021-01-11$15.59$15.59383,100
2021-01-08$15.40$15.40441,000
2021-01-07$15.58$15.58378,600
2021-01-06$15.02$15.02516,400
2021-01-05$14.84$14.84354,700
2021-01-04$14.98$14.98514,400