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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	No	No	No	No

Transaction Summary

Sold:	52,087 shares	Avg. Price: $1.34	Total Value: $69,713.24
Number of Shares After Transactions:	2,414,657 shares

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	2025-06-02	52,087	$1.34	2,414,657	No	4	S	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,972,875	Indirect	See footnote
Common Stock	652,500	Indirect	See footnote
Common Stock	652,500	Indirect	See footnote
Common Stock	652,500	Indirect	See footnote

Footnotes

The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $1.285 to $1.41. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff, the issuer, or any security holder of the issuer upon request.
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.