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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1653087	Alector Inc.	ALEC	Biological Products, (No Disgnostic Substances) (2836)	462702363

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1757964	Robert Paul	C/O Alector, Inc. 131 Oyster Point Blvd, Suite 600 South San Francisco CA 94080	Chief Medical Officer	No	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
Common Stock	Acquisiton	2021-02-09	17,091	$8.16	230,810	No	4	M	Direct
Common Stock	Acquisiton	2021-02-09	2,084	$10.14	232,894	No	4	M	Direct
Common Stock	Disposition	2021-02-09	19,175	$20.81	213,719	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2021-02-09	17,091	$0.00	17,091	$8.16
Common Stock	Employee Stock Option (right to buy)	Disposition	2021-02-09	2,084	$0.00	2,084	$10.14

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
217,450		2028-07-02	No	4	M	Direct
60,417		2028-11-06	No	4	M	Direct

Footnotes

The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan adopted on May 28, 2020.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.45 to $21.05, inclusive.
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.
One-fourth (1/4th) of the shares subject to the option vested on November 1, 2019 and one forty-eighth (1/48th) of the shares vest monthly thereafter.