144 0001250379 XXXXXXXX LIVE 0000879407 Arrowhead Pharmaceuticals 001-38042 177 E Colorado Boulevard Suite 700 Pasadena CA 91105 6267888035 Michael Perry Director common Merrill Lynch

75 Rockefeller Plaza New York NY 10019

16250 991129.29 135809558 12/05/2025 NASDAQ COMMON 05/14/2020 COMPENSATION ISSUER N 16250 05/14/2020 COMPENSATION Y 12/05/2025 Michael Perry