Alector, Inc. (ALEC) Insider Ownership

Historic Insider Ownership Trends

Alector's top three insider shareholders as of May 04, 2026 are Terrance Mcguire (Director, 10.85Mn shares), Terrance Mcguire (Director, 10.85Mn shares), Tillman U. Gerngross (Director, 2.64Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Terrance Mcguire - 0 10,853,817 13 Sep, 2023
Terrance Mcguire - 0 10,853,817 13 Sep, 2023
Tillman U. Gerngross - 2,644,319 0 15 Jun, 2023
Tillman U. Gerngross - 2,644,319 0 15 Jun, 2023
Arnon Rosenthal Chief Executive Officer 2,454,422 0 13 Mar, 2026
Arnon Rosenthal Chief Executive Officer 2,454,422 0 13 Mar, 2026
Arnon Rosenthal Chief Executive Officer 0 1,972,875 12 Nov, 2021
Arnon Rosenthal Chief Executive Officer 0 1,972,875 12 Nov, 2021
Robert King Chief Development Officer 550,871 0 04 Oct, 2022
Robert King Chief Development Officer 550,871 0 04 Oct, 2022
Sara Kenkare-Mitra President And Head Of Rd 501,652 0 03 Dec, 2025
Sara Kenkare-Mitra President And Head Of Rd 501,652 0 03 Dec, 2025
Neil Lindsay Berkley Cfo Chief Business Officer 399,260 0 13 Mar, 2026
Neil Lindsay Berkley Cfo Chief Business Officer 399,260 0 13 Mar, 2026
Gary Romano Chief Medical Officer 332,977 0 05 Mar, 2025
Gary Romano Chief Medical Officer 332,977 0 05 Mar, 2025
Marc Grasso Chief Financial Officer 296,072 0 04 Jun, 2025
Robert Paul Chief Medical Officer 234,319 0 11 Aug, 2021
Robert Paul Chief Medical Officer 234,319 0 11 Aug, 2021
David M. Wehner - 115,330 0 12 Jun, 2024
Grace Wong-Sarad Principal Accounting Officer 104,645 0 17 Apr, 2026
Louis J Jr Lavigne - 99,409 0 12 Jun, 2025
Kristine Yaffe - 95,409 0 23 Jun, 2025
Kristine Yaffe - 95,409 0 23 Jun, 2025
Richard H Scheller - 95,366 0 12 Jun, 2025
Elizabeth A. Garofalo - 89,950 0 12 Jun, 2025
Calvin Yu Vice President, Finance 76,686 0 07 Jul, 2021
Calvin Yu Vice President, Finance 76,686 0 07 Jul, 2021
Paula Hammond - 74,909 0 27 Aug, 2025
Paula Hammond - 74,909 0 27 Aug, 2025
Mark Altmeyer - 69,950 0 12 Jun, 2025
Errol B Desouza - 69,950 0 12 Jun, 2025
Mark Altmeyer - 69,950 0 12 Jun, 2025
Terrance Mcguire - 54,996 0 24 Aug, 2023
Terrance Mcguire - 54,996 0 24 Aug, 2023

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
16 Apr, 2026 Grace Wong-Sarad Common Stock D 1,820 $2.65 104,645 D S
15 Mar, 2026 Neil Lindsay Berkley Common Stock A 54,600 $0.00 399,260 D A
13 Mar, 2026 Arnon Rosenthal Common Stock A 116,246 $0.00 2,454,422 D A
13 Mar, 2026 Arnon Rosenthal Common Stock A 116,246 $0.00 2,454,422 D A
15 Mar, 2026 Neil Lindsay Berkley Common Stock A 54,600 $0.00 399,260 D A
10 Mar, 2026 Grace Wong-Sarad Common Stock D 1,000 $2.65 106,465 D S
02 Mar, 2026 Arnon Rosenthal Common Stock D 81,864 $2.12 2,338,176 D S
03 Mar, 2026 Grace Wong-Sarad Common Stock D 3,367 $2.08 107,465 D S
02 Mar, 2026 Arnon Rosenthal Common Stock D 81,864 $2.12 2,338,176 D S
02 Mar, 2026 Neil Lindsay Berkley Common Stock D 29,649 $2.12 344,660 D S
02 Mar, 2026 Grace Wong-Sarad Common Stock D 8,071 $2.12 110,832 D S
02 Mar, 2026 Neil Lindsay Berkley Common Stock D 29,649 $2.12 344,660 D S
26 Feb, 2026 Grace Wong-Sarad Common Stock D 4,079 $2.50 118,903 D S
05 Dec, 2025 Grace Wong-Sarad Common Stock D 4,753 $1.21 122,982 D S
03 Dec, 2025 Neil Lindsay Berkley Common Stock D 37,261 $1.12 374,309 D S
03 Dec, 2025 Sara Kenkare-Mitra Common Stock D 41,687 $1.12 501,652 D S
03 Dec, 2025 Neil Lindsay Berkley Common Stock D 37,261 $1.12 374,309 D S
03 Dec, 2025 Arnon Rosenthal Common Stock D 104,347 $1.12 2,420,040 D S
03 Dec, 2025 Sara Kenkare-Mitra Common Stock D 41,687 $1.12 501,652 D S
03 Dec, 2025 Arnon Rosenthal Common Stock D 104,347 $1.12 2,420,040 D S