Alector, Inc. — Director's Dealing 2021

Nov 8, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-11-04

Reporting Person: Rosenthal Arnon (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-11-04	Common Stock	S	55000	$25.00	Disposed	2247875	Indirect
2021-11-04	Common Stock	S	15000	$25.00	Disposed	697500	Indirect
2021-11-04	Common Stock	S	15000	$25.00	Disposed	697500	Indirect
2021-11-04	Common Stock	S	15000	$25.00	Disposed	697500	Indirect
2021-11-05	Common Stock	S	55000	$25.00	Disposed	2192875	Indirect
2021-11-05	Common Stock	S	15000	$25.00	Disposed	682500	Indirect
2021-11-05	Common Stock	S	15000	$25.00	Disposed	682500	Indirect
2021-11-05	Common Stock	S	15000	$25.00	Disposed	682500	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1455226	Direct

Footnotes

F1: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan.

F2: The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee.

F3: The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

F4: The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

F5: The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.