Alector, Inc. — Director's Dealing 2021

Aug 9, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-07-02

Reporting Person: SCHELLER RICHARD H (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-07-02	Common Stock	S	9981	$31.14	Disposed	0	Direct
2021-08-05	Common Stock	M	56260	$10.14	Acquired	56260	Direct
2021-08-05	Common Stock	S	52868	$27.6413	Disposed	3392	Direct
2021-08-05	Common Stock	S	3392	$28.3022	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-08-05	Stock option (right to buy)	$10.14	M	56260	Disposed	2028-11-05	Common Stock (56260)	Direct

Footnotes

F1: The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan.

F2: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares purchased ranging from $27.17 to $27.94 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price set forth in footnotes (2) and (3) to this Form 4.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.23 to $28.48, inclusive.

F4: The shares subject to the option vest in 48 equal monthly installments beginning on November 22, 2018.