Type	Name	Date
Underwriting agreement	Underwriting Agreement, by and among Seattle Genetics, Inc. and J.P. Morgan Securities LLC, SVB Leerink LLC and Goldman Sachs & Co. LLC, as representatives of the several underwriters named therein	07/24/2019
Underwriting agreement	Underwriting Agreement	02/02/2011

Type	Name	Date
By-Laws	Amended and Restated Bylaws of Seagen Inc	11/18/2022
By-Laws	Amended and Restated Bylaws of Seagen Inc	11/18/2022
By-Laws	Amended and Restated Bylaws of Seagen Inc	04/15/2022
By-Laws	Amended and Restated Bylaws of Seattle Genetics, Inc	01/16/2020

Type	Name	Date
Equity incentive plans	Seattle Genetics, Inc. Amended and Restated 2007 Equity Incentive Plan	05/26/2010

Type	Name	Date
Merger agreement	Agreement and Plan of Merger, by and among Seagen Inc., Pfizer Inc. and Aris Merger Sub, Inc	03/13/2023
Merger agreement	Agreement and Plan of Merger, by and among Seattle Genetics, Inc., Valley Acquisition Sub, Inc. and Cascadian Therapeutics, Inc	01/31/2018