Form 4 Filing for Elizabeth A. Garofalo

Elizabeth A. Garofalo, a director at Alector, Inc., acquired 28,700 shares of Common Stock and was granted an option to purchase 9,450 shares of Common Stock on June 17, 2026. The restricted stock units (RSUs) for the Common Stock vest on the earlier of June 17, 2027, or the date of the Issuer's next annual meeting. The stock 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. Both transactions were reported as direct acquisitions with a transaction price of $0.00.