Arnon Rosenthal plan to sell securities of Alector, Inc. under Form 144

Arnon Rosenthal filed Form 144 to notify SEC of plan to sell 67572 units of Alector, Inc. securities around 2026-06-02, with aggregate market value of $139,874.04. The total outstanding units is 111026437.0. The amount planned to be sold represents 0.06% of total outstanding units; Recent transactions in past 3 months include: On 03/02/2026, sold 81864 units for $173825.38;