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 Elizabeth G. M.D.
2	DIRECTOR Errol De Souza, Ph.D.
3	DIRECTOR Kristine Yaffe, M.D.
4	Ratification of the appointment of Ernst & Young, LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2026.
5	Advisory vote on executive compensation.