Alector, Inc. announced that Tillman Gerngross, Ph.D. informed of his resignation as Chairperson of the Company's board of directors, effective June 13, 2023, and his resignation as a director of the Board, effective June 15, 2023. Dr. Gerngross resigned for personal reasons and not as a result of any disagreement with the Company on any matter relating to the Company's operations, policies, or practices. The Company thanks Dr. Gerngross for his dedicated service as a director and wishes him the best in his future endeavors.