144 0001486672 XXXXXXXX LIVE 0000879407 ARROWHEAD PHARMACEUTICALS, INC. 001-38042 177 E COLORADO BLVD SUITE 700 PASADENA CA 91105 626-696-4702 Myszkowski Kenneth Allen Officer Common Merrill Lynch

75 Rockefeller Plz 2nd Flr New York NY 10019

10000 196877.46 124434442 01/07/2025 NASDAQ Common 01/04/2025 Compensation Ken Myszkowski N 10000 01/07/2025 Compensation N Ken Myszkowski

177 E Colorado Blvd Ste. 700 Pasadena CA 91105

Common 01/06/2025 27167 538565.20 01/07/2025 Ken Myszkowski