Louis J. Lavigne Jr. Receives 28,700 RSUs and 9,450 Stock Options at Alector, Inc.

This Form 4 filing reports equity awards granted to Louis J. Lavigne Jr., a director of Alector, Inc. On June 17, 2026, Lavigne received 28,700 restricted stock units (RSUs) representing shares of common stock, which vest on the earlier of June 17, 2027 or the date of the company's next annual meeting of stockholders. He also received 9,450 stock options with an exercise price of $0, expiring June 16, 2036, which vest in 12 monthly installments beginning July 17, 2026, or earlier upon the company's next annual meeting. Following these awards, Lavigne directly holds 128,109 shares and indirectly holds 10,552 shares through Lavrite, LLC. The filing was signed by Grace Wong-Sarad via power of attorney on June 17, 2026.