Alector, Inc. (ALEC) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, Alector's top three insider holders are Terrance Mcguire (Director, 10.85Mn shares), Venture Management Co. Vi, L.L.C. Polaris (TenPercentOwner, 9.85Mn 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
Venture Management Co. Vi, L.L.C. Polaris 0 9,853,817 31 May, 2024
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 0 1,972,875 12 Nov, 2021
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
Neil Lindsay Berkley Cfo Chief Business Officer 399,260 0 13 Mar, 2026
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
David M. Wehner 115,330 0 12 Jun, 2024
Grace Wong-Sarad Principal Accounting Officer 106,465 0 12 Mar, 2026
Shehnaaz Suliman President And Coo 102,598 0 14 Dec, 2021
Louis J Jr Lavigne 99,409 0 12 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
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
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
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
10 Mar, 2026 Grace Wong-Sarad Common Stock D 1,000 $2.65 106,465 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
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 Arnon Rosenthal Common Stock D 104,347 $1.12 2,420,040 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 Grace Wong-Sarad Common Stock D 8,056 $1.12 127,735 D S
10 Nov, 2025 Neil Lindsay Berkley Common Stock A 65,000 $0.00 411,570 D A
10 Nov, 2025 Arnon Rosenthal Common Stock A 174,167 $0.00 2,524,387 D A
10 Nov, 2025 Grace Wong-Sarad Common Stock A 32,343 $0.00 135,791 D A
10 Nov, 2025 Grace Wong-Sarad Employee Stock Option (right to buy) A 48,535 $0.00 48,535 D A
10 Nov, 2025 Neil Lindsay Berkley Employee Stock Option (right to buy) A 195,000 $0.00 195,000 D A
10 Nov, 2025 Arnon Rosenthal Employee Stock Option (right to buy) A 522,500 $0.00 522,500 D A
02 Sep, 2025 Grace Wong-Sarad Common Stock D 5,910 $2.50 103,448 D S