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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
1757799	Calvin Yu	C/O Alector, Inc. 131 Oyster Point Blvd, Suite 600 South San Francisco CA 94080	Vice President, Finance	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	Explanation
Common Stock	Acquisiton	2020-02-04	13,541	$8.16	188,835	No	4	M	Direct
Common Stock	Disposition	2020-02-04	63,541	$30.04	125,294	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	Stock Option (right to buy)	Disposition	2020-02-04	13,541	$0.00	13,541	$8.16

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
36,459		2028-07-01	No	4	M	Direct

Footnotes

The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan.
The sale price reported in column 4 of Table I represents the weighted average sale price of the shares purchased ranging from $30.00 to $30.11 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.
One forty-eighth (1/48th) of the shares subject to the option vested on August 2, 2018, and an additional one forty-eighth (1/48th) of the shares subject to the option shall vest each month thereafter.