Alector, Inc. — Director's Dealing 2021

Jul 6, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-07-01

Reporting Person: Paul Robert (Chief Medical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-07-01	Common Stock	S	26726	$22.2302	Disposed	246993	Direct
2021-07-02	Common Stock	M	17326	$17.15	Acquired	264319	Direct
2021-07-02	Common Stock	S	30000	$31.14	Disposed	234319	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-07-02	Employee Stock Option (right to buy)	$17.15	M	17326	Disposed	2029-11-06	Common Stock (17326)	Direct

Footnotes

F1: The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan adopted on May 28, 2020.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.49, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

F3: The shares subject to the option vest in 48 equal monthly installments beginning on December 6, 2019.