Alector, Inc. — Director's Dealing 2021

Mar 10, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-03-09

Reporting Person: Paul Robert (Chief Medical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-03-09	Common Stock	M	17092	$8.16	Acquired	230811	Direct
2021-03-09	Common Stock	M	2083	$10.14	Acquired	232894	Direct
2021-03-09	Common Stock	S	19175	$18.1176	Disposed	213719	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-03-09	Employee Stock Option (right to buy)	$8.16	M	17092	Disposed	2028-07-02	Common Stock (17092)	Direct
2021-03-09	Employee Stock Option (right to buy)	$10.14	M	2083	Disposed	2028-11-06	Common Stock (2083)	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 $18.00 to $18.36, 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: One forty-eighth (1/48th) of the shares subject to the option vested on August 2, 2018, and one forty-eighth (1/48th) of the shares subject to the option vest monthly thereafter.

F4: One-fourth (1/4th) of the shares subject to the option vested on November 1, 2019 and one forty-eighth (1/48th) of the shares vest monthly thereafter.