Alector's three largest insider shareholders as of May 30, 2026 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).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Terrance Mcguire | - | 0 | 10,853,817 | 13 Sep, 2023 |
| Robert King | Chief Development Officer | 550,871 | 0 | 04 Oct, 2022 |
| Mark Altmeyer | - | 69,950 | 0 | 12 Jun, 2025 |
| 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 |
| Calvin Yu | Vice President, Finance | 76,686 | 0 | 07 Jul, 2021 |
| Robert Paul | Chief Medical Officer | 234,319 | 0 | 11 Aug, 2021 |
| Kristine Yaffe | - | 95,409 | 0 | 23 Jun, 2025 |
| Gary Romano | Chief Medical Officer | 332,977 | 0 | 05 Mar, 2025 |
| Paula Hammond | - | 74,909 | 0 | 27 Aug, 2025 |
| Sara Kenkare-Mitra | President And Head Of Rd | 501,652 | 0 | 03 Dec, 2025 |
| Grace Wong-Sarad | Principal Accounting Officer | 104,645 | 0 | 17 Apr, 2026 |
| Neil Lindsay Berkley | Cfo Chief Business Officer | 399,260 | 0 | 13 Mar, 2026 |
* 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 |
| 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 |
| 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 |
| 02 Mar, 2026 | Neil Lindsay Berkley | Common Stock | D | 29,649 | $2.12 | 344,660 | D | S |
| 02 Mar, 2026 | Arnon Rosenthal | Common Stock | D | 81,864 | $2.12 | 2,338,176 | 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 | Neil Lindsay Berkley | Common Stock | D | 29,649 | $2.12 | 344,660 | D | S |
| 02 Mar, 2026 | Arnon Rosenthal | Common Stock | D | 81,864 | $2.12 | 2,338,176 | 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 | 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 |
| 03 Dec, 2025 | Neil Lindsay Berkley | Common Stock | D | 37,261 | $1.12 | 374,309 | D | S |
| 03 Dec, 2025 | Neil Lindsay Berkley | Common Stock | D | 37,261 | $1.12 | 374,309 | D | S |