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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$1.56$1.56768,800
2025-12-30$1.52$1.52676,100
2025-12-29$1.52$1.521,576,200
2025-12-26$1.45$1.45640,200
2025-12-24$1.45$1.45401,000
2025-12-23$1.41$1.411,095,700
2025-12-22$1.45$1.451,113,400
2025-12-19$1.40$1.403,004,700
2025-12-18$1.39$1.391,296,800
2025-12-17$1.35$1.35641,000
2025-12-16$1.39$1.39853,600
2025-12-15$1.42$1.421,219,600
2025-12-12$1.49$1.491,474,100
2025-12-11$1.46$1.465,002,400
2025-12-10$1.30$1.30978,000
2025-12-09$1.28$1.282,353,000
2025-12-08$1.22$1.221,642,700
2025-12-05$1.22$1.221,355,400
2025-12-04$1.21$1.212,787,900
2025-12-03$1.14$1.142,416,700
2025-12-02$1.14$1.141,397,900
2025-12-01$1.23$1.231,215,500
2025-11-28$1.33$1.33569,500
2025-11-26$1.35$1.351,338,800
2025-11-25$1.28$1.28821,600
2025-11-24$1.28$1.281,359,100
2025-11-21$1.24$1.241,066,300
2025-11-20$1.20$1.202,114,200
2025-11-19$1.22$1.221,529,900
2025-11-18$1.27$1.271,709,400
2025-11-17$1.24$1.241,616,400
2025-11-14$1.24$1.241,648,000
2025-11-13$1.20$1.202,597,400
2025-11-12$1.34$1.342,700,800
2025-11-11$1.36$1.361,343,600
2025-11-10$1.31$1.311,712,400
2025-11-07$1.28$1.281,976,900
2025-11-06$1.30$1.302,363,400
2025-11-05$1.26$1.261,772,300
2025-11-04$1.32$1.322,687,700
2025-11-03$1.44$1.441,642,900
2025-10-31$1.47$1.474,420,500
2025-10-30$1.52$1.522,580,700
2025-10-29$1.55$1.556,823,900
2025-10-28$1.50$1.503,881,700
2025-10-27$1.50$1.503,726,700
2025-10-24$1.50$1.506,637,500
2025-10-23$1.47$1.477,621,300
2025-10-22$1.61$1.6148,992,900
2025-10-21$3.21$3.214,470,700
2025-10-20$3.31$3.311,166,400
2025-10-17$3.04$3.041,043,300
2025-10-16$3.22$3.221,757,400
2025-10-15$3.19$3.191,724,400
2025-10-14$2.99$2.99987,700
2025-10-13$3.04$3.041,163,700
2025-10-10$3.02$3.02866,000
2025-10-09$3.14$3.141,112,100
2025-10-08$3.08$3.081,021,200
2025-10-07$3.07$3.071,064,200
2025-10-06$3.18$3.18983,900
2025-10-03$3.32$3.322,591,000
2025-10-02$3.16$3.161,069,600
2025-10-01$3.00$3.001,028,300
2025-09-30$2.96$2.96964,900
2025-09-29$3.05$3.05555,900
2025-09-26$3.10$3.101,024,400
2025-09-25$2.93$2.931,095,000
2025-09-24$3.16$3.16576,200
2025-09-23$3.18$3.18949,200
2025-09-22$3.18$3.181,113,400
2025-09-19$3.03$3.032,304,800
2025-09-18$3.13$3.13708,600
2025-09-17$2.95$2.951,322,400
2025-09-16$2.76$2.76581,600
2025-09-15$2.96$2.96925,000
2025-09-12$2.75$2.756,128,200
2025-09-11$2.87$2.87436,400
2025-09-10$2.84$2.84867,700
2025-09-09$2.80$2.80674,000
2025-09-08$2.76$2.761,266,700
2025-09-05$3.01$3.011,658,200
2025-09-04$2.82$2.821,038,800
2025-09-03$2.79$2.791,557,500
2025-09-02$2.59$2.591,750,000
2025-08-29$2.35$2.35465,100
2025-08-28$2.39$2.39712,900
2025-08-27$2.40$2.40683,800
2025-08-26$2.36$2.36625,500
2025-08-25$2.34$2.34841,000
2025-08-22$2.52$2.521,343,900
2025-08-21$2.27$2.27677,900
2025-08-20$2.20$2.201,290,100
2025-08-19$2.16$2.161,404,300
2025-08-18$2.13$2.131,392,700
2025-08-15$2.25$2.251,610,700
2025-08-14$2.46$2.462,445,300
2025-08-13$2.18$2.181,549,500
2025-08-12$2.00$2.001,719,900
2025-08-11$2.23$2.234,210,200
2025-08-08$2.15$2.158,927,400
2025-08-07$1.46$1.46651,800
2025-08-06$1.43$1.43518,400
2025-08-05$1.56$1.56603,500
2025-08-04$1.55$1.55487,400
2025-08-01$1.45$1.45737,100
2025-07-31$1.49$1.49650,900
2025-07-30$1.60$1.60657,200
2025-07-29$1.61$1.61627,600
2025-07-28$1.76$1.761,221,500
2025-07-25$1.76$1.76297,000
2025-07-24$1.79$1.79357,500
2025-07-23$1.78$1.78367,300
2025-07-22$1.72$1.72390,500
2025-07-21$1.62$1.62409,200
2025-07-18$1.59$1.59301,400
2025-07-17$1.67$1.67366,200
2025-07-16$1.56$1.56321,100
2025-07-15$1.55$1.55297,200
2025-07-14$1.67$1.67233,700
2025-07-11$1.61$1.61254,300
2025-07-10$1.72$1.72710,600
2025-07-09$1.65$1.65565,300
2025-07-08$1.52$1.52455,300
2025-07-07$1.44$1.44306,500
2025-07-03$1.51$1.51233,300
2025-07-02$1.50$1.50422,500
2025-07-01$1.42$1.42439,700
2025-06-30$1.40$1.40680,000
2025-06-27$1.48$1.482,122,400
2025-06-26$1.50$1.50362,900
2025-06-25$1.49$1.49376,600
2025-06-24$1.49$1.49398,500
2025-06-23$1.38$1.38332,500
2025-06-20$1.47$1.47709,000
2025-06-18$1.46$1.46494,500
2025-06-17$1.52$1.52496,300
2025-06-16$1.51$1.51741,000
2025-06-13$1.54$1.54408,800
2025-06-12$1.62$1.62322,400
2025-06-11$1.63$1.63509,700
2025-06-10$1.59$1.59718,700
2025-06-09$1.44$1.44360,400
2025-06-06$1.49$1.49738,600
2025-06-05$1.41$1.41351,800
2025-06-04$1.55$1.55656,900
2025-06-03$1.48$1.48561,800
2025-06-02$1.38$1.381,065,700
2025-05-30$1.33$1.33412,700
2025-05-29$1.42$1.42638,200
2025-05-28$1.42$1.42952,200
2025-05-27$1.26$1.26667,200
2025-05-23$1.24$1.24954,600
2025-05-22$1.31$1.312,266,900
2025-05-21$1.25$1.251,255,300
2025-05-20$1.37$1.372,280,300
2025-05-19$1.27$1.27848,300
2025-05-16$1.22$1.221,807,300
2025-05-15$1.11$1.111,328,600
2025-05-14$1.07$1.073,168,700
2025-05-13$1.11$1.11921,100
2025-05-12$1.20$1.201,166,000
2025-05-09$1.17$1.171,411,300
2025-05-08$1.04$1.04753,700
2025-05-07$1.02$1.02693,400
2025-05-06$1.05$1.05918,400
2025-05-05$1.16$1.16696,400
2025-05-02$1.30$1.301,281,800
2025-05-01$1.22$1.221,607,200
2025-04-30$1.20$1.201,543,500
2025-04-29$1.13$1.13373,000
2025-04-28$1.16$1.16605,700
2025-04-25$1.14$1.14452,300
2025-04-24$1.18$1.18553,400
2025-04-23$1.16$1.161,703,600
2025-04-22$1.11$1.112,733,100
2025-04-21$0.97$0.97673,500
2025-04-17$0.92$0.92471,700
2025-04-16$0.98$0.98628,200
2025-04-15$1.08$1.081,060,300
2025-04-14$0.98$0.98481,900
2025-04-11$0.95$0.95565,700
2025-04-10$0.90$0.90460,800
2025-04-09$0.98$0.98858,800
2025-04-08$0.94$0.94644,200
2025-04-07$1.01$1.011,281,400
2025-04-04$1.02$1.02823,500
2025-04-03$1.09$1.09763,600
2025-04-02$1.18$1.18384,000
2025-04-01$1.16$1.16766,900
2025-03-31$1.23$1.23601,400
2025-03-28$1.29$1.29385,400
2025-03-27$1.33$1.33471,000
2025-03-26$1.30$1.30330,500
2025-03-25$1.29$1.29545,800
2025-03-24$1.37$1.37281,100
2025-03-21$1.35$1.35967,900
2025-03-20$1.30$1.30408,900
2025-03-19$1.33$1.33482,600
2025-03-18$1.30$1.30456,500
2025-03-17$1.38$1.38474,600
2025-03-14$1.45$1.45392,300
2025-03-13$1.43$1.43404,800
2025-03-12$1.51$1.51587,000
2025-03-11$1.40$1.40828,200
2025-03-10$1.39$1.39688,500
2025-03-07$1.44$1.44722,200
2025-03-06$1.58$1.58570,000
2025-03-05$1.55$1.55650,100
2025-03-04$1.46$1.461,401,400
2025-03-03$1.41$1.412,379,900
2025-02-28$1.64$1.642,412,800
2025-02-27$1.66$1.661,600,000
2025-02-26$1.72$1.72578,700
2025-02-25$1.77$1.77549,800
2025-02-24$1.78$1.78388,300
2025-02-21$1.87$1.87461,300
2025-02-20$1.86$1.86455,700
2025-02-19$1.83$1.83488,100
2025-02-18$1.76$1.76400,400
2025-02-14$1.70$1.70306,000
2025-02-13$1.67$1.67351,800
2025-02-12$1.64$1.64425,700
2025-02-11$1.61$1.61519,400
2025-02-10$1.65$1.65447,200
2025-02-07$1.75$1.75699,300
2025-02-06$1.79$1.79400,800
2025-02-05$1.84$1.84549,400
2025-02-04$1.71$1.71485,400
2025-02-03$1.64$1.64461,600
2025-01-31$1.66$1.66615,900
2025-01-30$1.72$1.72491,400
2025-01-29$1.64$1.64477,400
2025-01-28$1.70$1.70623,000
2025-01-27$1.74$1.74427,000
2025-01-24$1.79$1.79335,400
2025-01-23$1.81$1.81439,700
2025-01-22$1.78$1.78443,500
2025-01-21$1.73$1.73488,500
2025-01-17$1.71$1.71529,400
2025-01-16$1.68$1.68912,200
2025-01-15$1.68$1.68904,400
2025-01-14$1.64$1.64758,600
2025-01-13$1.79$1.791,259,400
2025-01-10$1.80$1.80750,000
2025-01-08$1.88$1.88617,600
2025-01-07$1.98$1.98749,300
2025-01-06$2.02$2.02827,200
2025-01-03$2.06$2.06937,400
2025-01-02$1.89$1.891,078,600