Company: ARWR
Filing Date: 2025-01-29
Form Type: ARS
Source: 0001628280-25-002866
Chunk: 144

Company: ARROWHEAD PHARMACEUTICALS, INC.
Filing Date: 2025-01-29
Form: ARS
Chunk 144
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 has duly caused this report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized. Dated: November 26, 2024 ARROWHEAD PHARMACEUTICALS, INC. By: /s/ Christopher Anzalone Christopher Anzalone Chief Executive Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report on Form 10-K has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated: Signature Title Date /s/ Christopher Anzalone Chief Executive Officer, President and Director (Principal Executive Officer) November 26, 2024 Christopher Anzalone /s/ Kenneth A. Myszkowski Chief Financial Officer (Principal Financial and Accounting Officer) November 26, 2024 Kenneth A. Myszkowski /s/ Douglass Given Director, Chairman of the Board of Directors November 26, 2024 Douglass Given /s/ Mauro Ferrari Director November 26, 2024 Mauro Ferrari /s/ Michael S. Perry Director November 26, 2024 Michael S. Perry /s/ William Waddill Director November 26, 2024 William Waddill /s/ Adeoye Olukotun Director November 26, 2024 Adeoye Olukotun /s/ Victoria Vakiener Director November 26, 2024 Victoria Vakiener /s/ Hongbo Lu Director November 26, 2024 Hongbo Lu 81

Exhibit 21.1 Subsidiary Jurisdiction Arrowhead Madison Inc. Delaware Arrowhead Australia Pty Ltd Australia

Exhibit 31.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO RULE 13a-14(a) OR RULE 15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 I, Christopher Anzalone, Chief Executive Officer of Arrowhead Pharmaceuticals, Inc., certify that: 1. I have reviewed this Annual Report on Form 10-K of Arrowhead Pharmaceuticals, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included