Arnon Rosenthal - 03 Mar 2023 Form 4 Insider Report for Alector, Inc. (ALEC)

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALEC	Common Stock	Award	$0	+42,990	+2.6%	$0.000000	1,671,536	03 Mar 2023	Direct	F1
transaction	ALEC	Common Stock	Sale	$94,428	-15,186	-0.91%	$6.22	1,656,350	17 Mar 2023	Direct	F2
holding	ALEC	Common Stock						1,972,875	03 Mar 2023	See footnote	F3
holding	ALEC	Common Stock						652,500	03 Mar 2023	See footnote	F4
holding	ALEC	Common Stock						652,500	03 Mar 2023	See footnote	F5
holding	ALEC	Common Stock						652,500	03 Mar 2023	See footnote	F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	The reported shares are represented by restricted stock units, or RSUs, all of which were fully vested on the grant date.
F2	The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of RSUs.
F3	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.
F4	The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
F5	The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
F6	The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.