| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Wong-Sarad Grace | Principal Accounting Officer | C/O ALECTOR, INC., 131 OYSTER POINT BLVD., SUITE 600, SOUTH SAN FRANCISCO | /s/ Grace Wong-Sarad | 08 Dec 2025 | 0002074667 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ALEC | Common Stock | Sale | $5,751 | -4,753 | -3.7% | $1.21 | 122,982 | 05 Dec 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 5, 2025. |