144 0001830755 XXXXXXXX LIVE 0000879407 Arrowhead Pharmaceuticals Inc. 177 E. Colorado Blvd Ste 700 Pasadena CA 91105 6263043400 James Hamilton Officer Common Merrill Lynch 75 Rockefeller Plaza Fl 2 New York NY 10019 10000 749997.6 140032190 04/23/2026 Nasdaq Common 01/04/2026 Compensation James Hamilton N 5708 01/04/2026 Compensation Common 01/04/2026 Compensation James Hamilton N 542 01/04/2026 Compensation Common 01/04/2026 Compensation James Hamilton N 1628 01/04/2026 Compensation Common 01/04/2026 Compensation James Hamilton N 2122 01/04/2026 Compensation N James Hamilton 177 E. Colorado Blvd Suite 700 Pasadena CA 91105 Common 03/05/2026 10000 641870.05 04/23/2026 James Hamilton