Officer Sale of Shares for Tax Obligations

Grace Wong-Sarad, Principal Accounting Officer at Alector, Inc., reported the sale of 5,709 shares of Common Stock on June 2, 2026, for an average price of $1.9742 per share, resulting in 98,936 shares held post-transaction. On June 3, 2026, an additional 3,475 shares were sold at an average price of $1.8828, leaving 95,461 shares. These sales were executed to cover tax obligations related to vested restricted stock units and were conducted under a Rule 10b5-1 Trading Plan. The prices reported are weighted averages, with actual sale prices ranging from $1.86 to $2.08.