Form 4 Filing by Richard H. Scheller

Richard H. Scheller, a director at Alector, Inc., reported a transaction on June 17, 2026. He acquired 28,700 shares of Common Stock, represented by restricted stock units (RSUs) that vest on June 17, 2027, or the date of the Issuer's next annual meeting of stockholders. The acquisition price was $0.00 per share. Following this transaction, Scheller owns 134,899 shares of Common Stock directly. Additionally, Scheller was granted a stock option to buy 9,450 shares of Common Stock at an exercise price of $0.00. This option vests in 12 equal monthly installments starting July 17, 2026, or fully vests on the earlier of the one-year anniversary of the grant date or the date of the Issuer's next annual meeting of stockholders. After this, he owns 9,450 shares subject to the option.