Alector, Inc. ($ALEC) Insider Transactions

Last updated: 2026-03-14 11:58 UTC | Total transactions: 149

In the last 12 months, insiders at Alector, Inc. ($ALEC) filed 149 transactions with the SEC: 0 open-market purchases totaling $0 and 63 sales totaling $9,153,334. Net insider sentiment: net selling.

Alector, Inc. operates in the Biological products, (no disgnostic substances) industry (Life sciences sector).

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Recent Insider Transactions

Transaction Date Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
March 13, 2026 Rosenthal Arnon Chief Executive Officer A Common Stock 116246 $0.00 6,384,797.0000 109,151,472 1.85% 0.11%
March 15, 2026 Berkley Neil Lindsay CFO & Chief Business Officer A Common Stock 54600 $0.00 399,260.0000 109,151,472 15.84% 0.05%
March 10, 2026 Wong-Sarad Grace Principal Accounting Officer S Common Stock 1000 $2.65 106,465.0000 109,151,472 0.93% 0.00%
March 2, 2026 Wong-Sarad Grace Principal Accounting Officer S Common Stock 8071 $2.12 110,832.0000 109,151,472 6.79% 0.01%
March 2, 2026 Rosenthal Arnon Chief Executive Officer S Common Stock 81864 $2.12 6,268,551.0000 109,151,472 1.29% 0.08%
March 2, 2026 Berkley Neil Lindsay CFO & Chief Business Officer S Common Stock 29649 $2.12 344,660.0000 109,151,472 7.92% 0.03%
March 3, 2026 Wong-Sarad Grace Principal Accounting Officer S Common Stock 3367 $2.08 107,465.0000 109,151,472 3.04% 0.00%
Feb. 26, 2026 Wong-Sarad Grace Principal Accounting Officer S Common Stock 4079 $2.50 118,903.0000 109,151,472 3.32% 0.00%
Dec. 5, 2025 Wong-Sarad Grace Principal Accounting Officer S Common Stock 4753 $1.21 122,982.0000 109,151,472 3.72% 0.00%
Dec. 3, 2025 Kenkare-Mitra Sara President and Head of R&D S Common Stock 41687 $1.12 501,652.0000 109,151,472 7.67% 0.04%
Dec. 3, 2025 Berkley Neil Lindsay Chief Bus Ofcr & Interim CFO S Common Stock 37261 $1.12 374,309.0000 109,151,472 9.05% 0.03%
Dec. 3, 2025 Wong-Sarad Grace Principal Accounting Officer S Common Stock 8056 $1.12 127,735.0000 109,151,472 5.93% 0.01%
Dec. 3, 2025 Rosenthal Arnon Chief Executive Officer S Common Stock 104347 $1.12 6,350,415.0000 109,151,472 1.62% 0.10%
Nov. 10, 2025 Berkley Neil Lindsay Chief Bus Ofcr & Interim CFO A Common Stock 65000 $0.00 411,570.0000 109,151,472 18.76% 0.06%
Nov. 10, 2025 Rosenthal Arnon Chief Executive Officer A Employee Stock Option (right to buy) 522500 $0.00 522,500.0000 109,151,472 9999.99% 0.48%
Nov. 10, 2025 Rosenthal Arnon Chief Executive Officer A Common Stock 174167 $0.00 6,454,762.0000 109,151,472 2.77% 0.16%
Nov. 10, 2025 Wong-Sarad Grace Principal Accounting Officer A Employee Stock Option (right to buy) 48535 $0.00 48,535.0000 109,151,472 9999.99% 0.04%
Nov. 10, 2025 Wong-Sarad Grace Principal Accounting Officer A Common Stock 32343 $0.00 135,791.0000 109,151,472 31.26% 0.03%
Nov. 10, 2025 Berkley Neil Lindsay Chief Bus Ofcr & Interim CFO A Employee Stock Option (right to buy) 195000 $0.00 195,000.0000 109,151,472 9999.99% 0.18%
Sept. 2, 2025 Rosenthal Arnon Chief Executive Officer S Common Stock 51562 $2.50 6,280,595.0000 99,085,888 0.81% 0.05%
Sept. 2, 2025 Kenkare-Mitra Sara President and Head of R&D S Common Stock 23638 $2.50 543,339.0000 99,085,888 4.17% 0.02%
Sept. 2, 2025 Berkley Neil Lindsay Principal Financial Officer S Common Stock 15842 $2.50 346,570.0000 99,085,888 4.37% 0.02%
Sept. 2, 2025 Wong-Sarad Grace Principal Accounting Officer S Common Stock 5910 $2.50 103,448.0000 99,085,888 5.40% 0.01%
Aug. 26, 2025 Hammond Paula Not found S Common Stock 14000 $2.36 74,909.0000 99,085,888 15.75% 0.01%
July 1, 2025 Kenkare-Mitra Sara President and Head of R&D A Employee Stock Option (right to buy) 18250 $0.00 18,250.0000 99,085,888 9999.99% 0.02%
July 1, 2025 Rosenthal Arnon Chief Executive Officer A Employee Stock Option (right to buy) 45700 $0.00 45,700.0000 99,085,888 9999.99% 0.05%
July 1, 2025 Rosenthal Arnon Chief Executive Officer A Common Stock 137125 $0.00 6,482,157.0000 99,085,888 2.16% 0.14%
July 1, 2025 Kenkare-Mitra Sara President and Head of R&D A Common Stock 54725 $0.00 566,977.0000 99,085,888 10.68% 0.06%
July 1, 2025 Berkley Neil Lindsay Principal Financial Officer A Employee Stock Option (right to buy) 18000 $0.00 18,000.0000 99,085,888 9999.99% 0.02%
June 20, 2025 Yaffe Kristine Not found S Common Stock 1000 $1.44 95,409.0000 99,085,888 1.04% 0.00%
June 11, 2025 Altmeyer Mark Not found A Common Stock 28700 $0.00 69,950.0000 99,085,888 69.58% 0.03%
June 11, 2025 Hammond Paula Not found A Common Stock 28700 $0.00 88,909.0000 99,085,888 47.67% 0.03%
June 11, 2025 Hammond Paula Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 Yaffe Kristine Not found A Common Stock 28700 $0.00 96,409.0000 99,085,888 42.39% 0.03%
June 11, 2025 Yaffe Kristine Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 GAROFALO ELIZABETH A. Not found A Common Stock 28700 $0.00 89,950.0000 99,085,888 46.86% 0.03%
June 11, 2025 GAROFALO ELIZABETH A. Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 SCHELLER RICHARD H Not found A Common Stock 28700 $0.00 95,366.0000 99,085,888 43.05% 0.03%
June 11, 2025 SCHELLER RICHARD H Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 LAVIGNE LOUIS J JR Not found A Common Stock 28700 $0.00 109,961.0000 99,085,888 35.32% 0.03%
June 11, 2025 LAVIGNE LOUIS J JR Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 DESOUZA ERROL B Not found A Common Stock 28700 $0.00 69,950.0000 99,085,888 69.58% 0.03%
June 11, 2025 DESOUZA ERROL B Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 11, 2025 Altmeyer Mark Not found A Stock Option (right to buy) 9450 $0.00 9,450.0000 99,085,888 9999.99% 0.01%
June 2, 2025 GRASSO MARC Chief Financial Officer S Common Stock 16488 $1.34 296,072.0000 99,085,888 5.28% 0.02%
June 2, 2025 Kenkare-Mitra Sara President and Head of R&D S Common Stock 23890 $1.34 512,252.0000 99,085,888 4.46% 0.02%
June 2, 2025 Rosenthal Arnon Chief Executive Officer S Common Stock 52087 $1.34 6,345,032.0000 99,085,888 0.81% 0.05%
May 2, 2025 SCHELLER RICHARD H Not found A Common Stock 15833 $0.00 66,666.0000 99,085,888 31.15% 0.02%
March 3, 2025 GRASSO MARC Chief Financial Officer S Common Stock 18091 $1.47 312,560.0000 99,085,888 5.47% 0.02%
March 3, 2025 Kenkare-Mitra Sara President and Head of R&D S Common Stock 29073 $1.47 536,142.0000 99,085,888 5.14% 0.03%
March 3, 2025 Rosenthal Arnon Chief Executive Officer S Common Stock 40330 $1.47 6,397,119.0000 99,085,888 0.63% 0.04%
March 3, 2025 Romano Gary Chief Medical Officer S Common Stock 16306 $1.47 332,977.0000 99,085,888 4.67% 0.02%
Dec. 2, 2024 Romano Gary Chief Medical Officer S Common Stock 14892 $2.52 349,283.0000 0 4.09% 0.00%
Dec. 2, 2024 GRASSO MARC Chief Financial Officer S Common Stock 16489 $2.52 330,651.0000 0 4.75% 0.00%
Dec. 2, 2024 Rosenthal Arnon Chief Executive Officer S Common Stock 52172 $2.52 6,437,449.0000 0 0.80% 0.00%
Dec. 2, 2024 Kenkare-Mitra Sara President and Head of R&D S Common Stock 26500 $2.52 565,215.0000 0 4.48% 0.00%
Aug. 2, 2024 SCHELLER RICHARD H Not found A Common Stock 15833 $0.00 50,833.0000 0 45.24% 0.00%
Oct. 1, 2024 Romano Gary Chief Medical Officer A Common Stock 184380 $0.00 364,175.0000 0 102.55% 0.00%
Oct. 1, 2024 Rosenthal Arnon Chief Executive Officer A Common Stock 610500 $0.00 6,489,621.0000 0 10.38% 0.00%
Oct. 1, 2024 Kenkare-Mitra Sara President and Head of R&D A Common Stock 300000 $0.00 591,715.0000 0 102.84% 0.00%
Oct. 1, 2024 GRASSO MARC Chief Financial Officer A Common Stock 216400 $0.00 347,140.0000 0 165.52% 0.00%
Sept. 3, 2024 Kenkare-Mitra Sara President and Head of R&D S Common Stock 13926 $4.88 291,715.0000 0 4.56% 0.00%
Sept. 3, 2024 GRASSO MARC Chief Financial Officer S Common Stock 7297 $4.88 130,740.0000 0 5.29% 0.00%
Sept. 3, 2024 Rosenthal Arnon Chief Executive Officer S Common Stock 26499 $4.88 5,879,121.0000 0 0.45% 0.00%
Sept. 3, 2024 Romano Gary Chief Medical Officer S Common Stock 8478 $4.88 179,795.0000 0 4.50% 0.00%
Aug. 22, 2024 SCHELLER RICHARD H Not found S Common Stock 44250 $5.16 35,000.0000 0 55.84% 0.00%
Aug. 12, 2024 Hammond Paula Not found S Common Stock 10500 $5.06 60,209.0000 0 14.85% 0.00%
Aug. 12, 2024 Yaffe Kristine Not found S Common Stock 5000 $5.06 67,709.0000 0 6.88% 0.00%
June 12, 2024 LAVIGNE LOUIS J JR Not found A Common Stock 35000 $0.00 81,261.0000 0 75.66% 0.00%
June 12, 2024 SCHELLER RICHARD H Not found A Common Stock 35000 $0.00 79,250.0000 0 79.10% 0.00%
June 12, 2024 GAROFALO ELIZABETH A. Not found A Common Stock 35000 $0.00 61,250.0000 0 133.33% 0.00%
June 12, 2024 Yaffe Kristine Not found A Common Stock 35000 $0.00 72,709.0000 0 92.82% 0.00%
June 12, 2024 Hammond Paula Not found A Common Stock 35000 $0.00 70,709.0000 0 98.01% 0.00%
June 12, 2024 Wehner David M. Not found A Common Stock 35000 $0.00 115,330.0000 0 43.57% 0.00%
June 3, 2024 GRASSO MARC Chief Financial Officer S Common Stock 6920 $4.80 138,037.0000 0 4.77% 0.00%
June 3, 2024 Kenkare-Mitra Sara President and Head of R&D S Common Stock 13206 $4.80 305,641.0000 0 4.14% 0.00%
June 3, 2024 Romano Gary Chief Medical Officer S Common Stock 8040 $4.80 188,273.0000 0 4.10% 0.00%
June 3, 2024 Rosenthal Arnon Chief Executive Officer S Common Stock 25135 $4.80 5,905,620.0000 0 0.42% 0.00%
May 29, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 98533 $0.00 9,853,817.0000 0 0.99% 0.00%
May 29, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 500000 $0.00 9,853,817.0000 0 4.83% 0.00%
May 29, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 98533 $0.00 9,952,350.0000 0 1.00% 0.00%
April 30, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 98533 $0.00 10,353,817.0000 0 0.94% 0.00%
April 30, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 98533 $0.00 10,452,350.0000 0 0.95% 0.00%
April 30, 2024 Polaris Venture Management Co. VI, L.L.C. Not found J Common Stock 500000 $0.00 10,353,817.0000 0 4.61% 0.00%
March 19, 2024 Altmeyer Mark Not found A Stock Option (right to buy) 19420 $0.00 19,420.0000 0 9999.99% 0.00%
March 19, 2024 DESOUZA ERROL B Not found A Common Stock 41250 $0.00 41,250.0000 0 9999.99% 0.00%
March 19, 2024 DESOUZA ERROL B Not found A Stock Option (right to buy) 19420 $0.00 19,420.0000 0 9999.99% 0.00%
March 19, 2024 Altmeyer Mark Not found A Common Stock 41250 $0.00 41,250.0000 0 9999.99% 0.00%
March 4, 2024 Romano Gary Chief Medical Officer S Common Stock 6001 $6.92 196,313.0000 0 2.97% 0.00%
March 4, 2024 Kenkare-Mitra Sara President and Head of R&D S Common Stock 10169 $6.92 318,847.0000 0 3.09% 0.00%
March 4, 2024 GRASSO MARC Chief Financial Officer S Common Stock 5716 $6.92 144,957.0000 0 3.79% 0.00%
March 4, 2024 Rosenthal Arnon Chief Executive Officer S Common Stock 18837 $6.92 5,930,755.0000 0 0.32% 0.00%
July 15, 2023 SCHELLER RICHARD H Not found A Common Stock 8541 $0.00 44,250.0000 0 23.92% 0.00%
Dec. 4, 2023 Rosenthal Arnon Chief Executive Officer S Common Stock 23831 $5.56 5,949,592.0000 0 0.40% 0.00%
Dec. 5, 2023 GAROFALO ELIZABETH A. Not found G Common Stock 9459 $0.00 26,250.0000 0 26.49% 0.00%
Dec. 4, 2023 Romano Gary Chief Medical Officer S Common Stock 5035 $5.56 202,314.0000 0 2.43% 0.00%
Dec. 4, 2023 Kenkare-Mitra Sara President and Head of R&D S Common Stock 12519 $5.56 329,016.0000 0 3.67% 0.00%
Dec. 4, 2023 GRASSO MARC Chief Financial Officer S Common Stock 4574 $5.56 150,673.0000 0 2.95% 0.00%
Oct. 1, 2023 GRASSO MARC Chief Financial Officer A Employee Stock Option (right to buy) 41000 $0.00 41,000.0000 0 9999.99% 0.00%
Oct. 1, 2023 Romano Gary Chief Medical Officer A Common Stock 108000 $0.00 207,349.0000 0 108.71% 0.00%
Oct. 1, 2023 Romano Gary Chief Medical Officer A Employee Stock Option (right to buy) 36000 $0.00 36,000.0000 0 9999.99% 0.00%
Oct. 1, 2023 GRASSO MARC Chief Financial Officer A Common Stock 123000 $0.00 155,247.0000 0 381.43% 0.00%
Oct. 1, 2023 Kenkare-Mitra Sara President and Head of R&D A Common Stock 163600 $0.00 341,535.0000 0 91.94% 0.00%
Oct. 1, 2023 Kenkare-Mitra Sara President and Head of R&D A Employee Stock Option (right to buy) 54500 $0.00 54,500.0000 0 9999.99% 0.00%
Oct. 1, 2023 Rosenthal Arnon Chief Executive Officer A Common Stock 397600 $0.00 5,973,423.0000 0 7.13% 0.00%
Oct. 1, 2023 Rosenthal Arnon Chief Executive Officer A Employee Stock Option (right to buy) 132500 $0.00 132,500.0000 0 9999.99% 0.00%
Sept. 11, 2023 Polaris Venture Management Co. VI, L.L.C. TenPercentOwner S Common Stock 500000 $6.00 10,853,817.0000 0 4.40% 0.00%
Sept. 11, 2023 MCGUIRE TERRANCE Director S Common Stock 500000 $6.00 10,948,212.0000 0 4.37% 0.00%
Sept. 5, 2023 Rosenthal Arnon Chief Executive Officer S Common Stock 5647 $5.19 5,575,823.0000 0 0.10% 0.00%
Sept. 5, 2023 Kenkare-Mitra Sara President and Head of R&D S Common Stock 6214 $5.19 177,935.0000 0 3.37% 0.00%
Sept. 5, 2023 Romano Gary Chief Medical Officer S Common Stock 2771 $5.19 99,349.0000 0 2.71% 0.00%
Sept. 5, 2023 GRASSO MARC Chief Financial Officer S Common Stock 1114 $5.19 32,247.0000 0 3.34% 0.00%
Aug. 22, 2023 MCGUIRE TERRANCE Director J Common Stock 13133 $0.00 94,395.0000 0 16.16% 0.00%
Aug. 22, 2023 Polaris Venture Management Co. VI, L.L.C. TenPercentOwner J Common Stock 98533 $0.00 11,353,817.0000 0 0.86% 0.00%
Aug. 22, 2023 Polaris Venture Management Co. VI, L.L.C. TenPercentOwner J Common Stock 500000 $0.00 11,353,817.0000 0 4.22% 0.00%
Aug. 22, 2023 Polaris Venture Management Co. VI, L.L.C. TenPercentOwner J Common Stock 98533 $0.00 11,452,350.0000 0 0.87% 0.00%
Aug. 22, 2023 MCGUIRE TERRANCE Director J Common Stock 500000 $0.00 11,408,813.0000 0 4.20% 0.00%
Aug. 22, 2023 MCGUIRE TERRANCE Director J Common Stock 6429 $0.00 94,395.0000 0 7.31% 0.00%
Aug. 22, 2023 MCGUIRE TERRANCE Director J Common Stock 98533 $0.00 153,549.0000 0 179.10% 0.00%
Aug. 22, 2023 MCGUIRE TERRANCE Director J Common Stock 98533 $0.00 54,996.0000 0 64.18% 0.00%
June 14, 2023 GAROFALO ELIZABETH A. Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 LAVIGNE LOUIS J JR Not found A Common Stock 26250 $0.00 46,261.0000 0 131.18% 0.00%
June 14, 2023 Gerngross Tillman U. Not found A Common Stock 26250 $0.00 2,644,319.0000 0 1.00% 0.00%
June 14, 2023 Gerngross Tillman U. Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 MCGUIRE TERRANCE Not found A Common Stock 26250 $0.00 11,928,650.0000 0 0.22% 0.00%
June 14, 2023 MCGUIRE TERRANCE Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 Wehner David M. Not found A Common Stock 26250 $0.00 80,330.0000 0 48.54% 0.00%
June 14, 2023 Wehner David M. Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 Yaffe Kristine Not found A Common Stock 26250 $0.00 35,709.0000 0 277.51% 0.00%
June 14, 2023 Yaffe Kristine Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 LAVIGNE LOUIS J JR Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 SCHELLER RICHARD H Not found A Common Stock 26250 $0.00 35,709.0000 0 277.51% 0.00%
June 14, 2023 SCHELLER RICHARD H Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 Hammond Paula Not found A Stock Option (right to buy) 12360 $0.00 12,360.0000 0 9999.99% 0.00%
June 14, 2023 GAROFALO ELIZABETH A. Not found A Common Stock 26250 $0.00 35,709.0000 0 277.51% 0.00%
June 14, 2023 Hammond Paula Not found A Common Stock 26250 $0.00 35,709.0000 0 277.51% 0.00%
June 2, 2023 Kenkare-Mitra Sara President and Head of R&D S Common Stock 4092 $6.90 184,149.0000 0 2.17% 0.00%
June 2, 2023 Rosenthal Arnon Chief Executive Officer S Common Stock 5255 $6.90 5,581,470.0000 0 0.09% 0.00%
June 2, 2023 Romano Gary Chief Medical Officer S Common Stock 2617 $6.90 102,120.0000 0 2.50% 0.00%
June 2, 2023 GRASSO MARC Chief Financial Officer S Common Stock 1050 $6.90 33,361.0000 0 3.05% 0.00%
March 17, 2023 Rosenthal Arnon Chief Executive Officer S Common Stock 15186 $6.22 5,586,725.0000 0 0.27% 0.00%
March 3, 2023 Rosenthal Arnon Chief Executive Officer A Common Stock 42990 $0.00 5,601,911.0000 0 0.77% 0.00%
Dec. 2, 2022 Romano Gary Chief Medical Officer S Common Stock 2145 $8.71 107,975.0000 0 1.95% 0.00%
March 2, 2023 Rosenthal Arnon Chief Executive Officer S Common Stock 5849 $8.32 5,558,921.0000 0 0.11% 0.00%
March 2, 2023 GRASSO MARC Chief Financial Officer S Common Stock 1291 $8.32 34,411.0000 0 3.62% 0.00%
March 2, 2023 Kenkare-Mitra Sara President and Head of R&D S Common Stock 10124 $8.32 188,241.0000 0 5.10% 0.00%
March 2, 2023 Romano Gary Chief Medical Officer S Common Stock 3238 $8.32 104,737.0000 0 3.00% 0.00%
Sept. 10, 2021 Yaffe Kristine Director M Common Stock 2000 $18.10 2,000.0000 0 9999.99% 0.00%
Sept. 10, 2021 Yaffe Kristine Director M Stock Option (right to buy) 2000 $0.00 38,000.0000 0 5.00% 0.00%