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).
| 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.
| 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 |