Alector, Inc. — Director's Dealing 2021

Feb 11, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-02-09

Reporting Person: Paul Robert (Chief Medical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-09	Common Stock	M	17091	$8.16	Acquired	230810	Direct
2021-02-09	Common Stock	M	2084	$10.14	Acquired	232894	Direct
2021-02-09	Common Stock	S	19175	$20.8112	Disposed	213719	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-09	Employee Stock Option (right to buy)	$8.16	M	17091	Disposed	2028-07-02	Common Stock (17091)	Direct
2021-02-09	Employee Stock Option (right to buy)	$10.14	M	2084	Disposed	2028-11-06	Common Stock (2084)	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 $20.45 to $21.05, inclusive.

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.