Grace Wong-Sarad plan to sell securities of Alector, Inc. under Form 144

Grace Wong-Sarad filed Form 144 to notify SEC of plan to sell 5239 units of Alector, Inc. securities around 2026-06-02, with aggregate market value of $10,844.73. The total outstanding units is 111026437.0. The amount planned to be sold represents 0.00% of total outstanding units; Recent transactions in past 3 months include: On 02/26/2026, sold 4079 units for $10197.50; On 03/02/2026, sold 8071 units for $17138.02; On 03/03/2026, sold 3367 units for $7012.02; On 03/10/2026, sold 1000 units for $2650.00; On 04/16/2026, sold 1820 units for $4823.00;