Exhibit 31.3

CERTIFICATIONS PURSUANT TO RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Malte Peters, certify that:

I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K/A of HOOKIPA Pharma Inc.; and

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.

Date: April 30, 2025		/s/ Malte Peters
		Malte Peters
		Chief Executive Officer
		(Principal Executive Officer)