Alector, Inc. — Director's Dealing 2019

May 14, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2019-05-10

Reporting Person: Gerngross Tillman U. (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-05-10	Stock Option (right to buy)	$20.05	A	20000	Acquired	2029-05-09	Common Stock (20000)	Direct

Footnotes

F1: One twelfth (1/12th) of the shares subject to the option shall vest each month after the date of grant, provided that the option will vest in full on the earlier of (i) the twelve (12) month anniversary of the date of grant, or (ii) the date of the next regularly scheduled annual meeting of the Issuer's stockholders, in each case subject to the Reporting Person continuing to be a service provider through each applicable vesting date. The shares subject to the option will become fully vested and exercisable immediately prior to a change in control, subject to the Reporting Person continuing to be a service provider.