Form of Proxy

ALECTOR, INC.

Notes

BD Client Code:

Client Name:

Number of Shares Held in a BD Nominee Company:

No.	Proposition		For	Against	Abstain
1	DIRECTOR Arnon Rosenthal, Ph.D.
2	DIRECTOR Paula Hammond, Ph.D.
3	Ratification of the appointment of Ernst & Young, LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2025.
4	Advisory vote on executive compensation.