Publication of supplementary prospectus by Westpac Securities NZ Limited and Westpac New Zealand Limited

The following supplementary prospectus has been approved by the Financial Conduct Authority and is available for viewing:

Supplementary prospectus dated 5 May 2026 (the "Supplement") to the Base Prospectus dated 24 November 2025 (the "Base Prospectus"), relating to the U.S.$15,000,000,000 Programme for the Issuance of Debt Instruments established by Westpac Securities NZ Limited unconditionally and irrevocably guaranteed by Westpac New Zealand Limited.

To view the Supplement in full, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/0869D_1-2026-5-5.pdf

A copy of the Supplement has been submitted to the National Storage Mechanism and will shortly be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

For further information, please contact:

Andrew Akerman
Westpac Securities NZ Limited (London Branch)

Level 2 2 Gresham Street,

London EC2V 7AD

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Supplement and the Base Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Base Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Base Prospectus is not addressed.  Prior to relying on the information contained in the Base Prospectus, you must ascertain from the Base Prospectus whether or not you are part of the intended addressees of the information contained therein.

This publication does not constitute an offering of debt instruments (the "Instruments") or the guarantee (the "Guarantee") thereof, and is not for distribution in or into the United States.  The Instruments and the Guarantee of the Instruments have not been and will not be registered under the United States Securities Act of 1933 as amended (the "Securities Act") or any relevant securities laws of any state of the United States and, subject to certain exceptions, the Instruments may not be offered, sold or delivered in the United States or to, or for the account or benefit of, U.S. persons, as such terms are defined in Regulation S under the Securities Act.  Instruments (and the Guarantee thereof) in bearer form are subject to U.S. tax law requirements and may not be offered, sold or delivered within the United States or its possessions or to a U.S. person, except in certain transactions permitted by U.S. tax regulations.  Terms used in the preceding sentence have the meanings given to them by the U.S. Internal Revenue Code and regulations thereunder.  There will be no public offering of the Instruments or the Guarantee of the Instruments in the United States.

Your right to access this service is conditional upon complying with the above requirement.  In particular, your accessing this service will constitute your representation that you are not in the United States and you are not a U.S. person within the meaning of Regulation S under the Securities Act and the U.S. Internal Revenue Code and regulations thereunder.

END