Alector, Inc. — Director's Dealing 2021

Mar 24, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2021-03-22

Reporting Person: Paul Robert (Chief Medical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-03-22	Common Stock	M	30000	$8.16	Acquired	243719	Direct
2021-03-22	Common Stock	S	24490	$22.8502	Disposed	219229	Direct
2021-03-22	Common Stock	S	5510	$23.5525	Disposed	213719	Direct
2021-03-23	Common Stock	M	13800	$8.16	Acquired	227519	Direct
2021-03-23	Common Stock	S	13800	$22.21	Disposed	213719	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-03-22	Employee Stock Option (right to buy)	$8.16	M	30000	Disposed	2028-07-02	Common Stock (30000)	Direct
2021-03-22	Employee Stock Option (right to buy)	$8.16	M	13800	Disposed	2028-07-02	Common Stock (13800)	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 sale price reported in column 4 of Table I represents the weighted average sale price of the shares purchased ranging from $22.41 to $23.38 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 within the ranges 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 $23.44 to $23.97, inclusive.

F4: 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.