SEC Filing Summary

Grace Wong-Sarad, Principal Accounting Officer of Alector, Inc., reported the sale of 656 shares of Common Stock on September 2, 2026, for $2.75 per share. On September 3, 2026, she sold 5,165 shares at a weighted average price of $2.6655, ranging from $2.49 to $2.52. On September 4, 2026, she sold 3,625 shares at a weighted average price of $2.5088. These sales were conducted under a Rule 10b5-1 Trading Plan and were effected to satisfy tax obligations related to RSU vesting. Following these transactions, Wong-Sarad holds 106,015 shares of Alector, Inc. common stock.