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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1653087	Alector Inc.	ALEC	Biological Products, (No Disgnostic Substances) (2836)	822933343

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1757770	Arnon Rosenthal	C/O Alector, Inc. 131 Oyster Point Blvd, Suite 600 South San Francisco CA 94080	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2021-11-10	55,000	$25.00	2,027,875	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-11-11	55,000	$25.00	1,972,875	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	652,500	Indirect	See footnote
Common Stock	652,500	Indirect	See footnote
Common Stock	652,500	Indirect	See footnote
Common Stock	1,455,226	Direct

Footnotes

The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan.
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.
The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.