144/A 0000950170-23-043091 0001361966 XXXXXXXX LIVE 0001060736 Seagen Inc. 000-32405 21823 30th Dr. SE Bothell WA 98021 (425)-527-4000 Vaughn B. Himes Officer Common Stock ETRADE FINANCIAL CORPORATION

3 EDISON DRIVE Alpharetta GA 30005

2725 528292.68 187697935 08/16/2023 NASDAQ Common Stock 08/15/2023 Vesting of Restricted Stock Units Issuer N 1649 08/15/2023 Compensation Common Stock 08/15/2023 Vesting of Restricted Stock Units Issuer N 2180 08/15/2023 Compensation Common Stock 08/15/2023 Vesting of Restricted Stock Units Issuer N 3004 08/15/2023 Compensation N Vaughn B. Himes

21823 30th Drive SE Bothell WA 98021

Common Stock 06/07/2023 16215 3166570.6 The sales reported on this Form 144 are being effected pursuant to written agreements governing the terms of restricted stock units granted to the filer, which include plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) to satisfy tax obligations arising out of the vesting of such stock units (the "Sell-to-Cover Trading Arrangement"). The written agreement adopted September 21, 2022 provides that, if the filer is in possession of material, nonpublic information as of the date of grant of such stock units, then the Sell-to-Cover Trading Arrangement becomes a binding contract as of the first date thereafter on which the filer is not in possession of material, nonpublic information. 08/16/2023 11/03/2020 11/02/2021 09/21/2022 /s/ Jessica Nielsen Causey For: Vaughn B. Himes