Form 4 Filing for Paula Hammond

Paula Hammond, a director at Alector, Inc., acquired 28,700 shares of Common Stock and was granted 9,450 stock options 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 options vest in 12 equal monthly installments starting July 17, 2026, with full vesting on the one-year anniversary of the grant date or the next annual meeting date. Both transactions were reported as direct acquisitions (Code A) with a price of $0.00. Following these transactions, Hammond directly owns 103,609 shares of Common Stock.