Company: WEBNF
Filing Date: 2025-06-26
Form Type: 424B5
Source: 0001104659-25-062718
Chunk: 62

Company: WESTPAC BANKING CORP
Filing Date: 2025-06-26
Form: 424B5
Chunk 62
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 | ​ | ​ | ​               | ​ | 0.7097 | ​ | ​ | ​ | ​    | ​ | 0.7598 | ​ | ​ | ​ | ​   | ​ | 0.6437 | ​ | ​ |
| 2023           | ​ | ​ | ​             | ​ | 0.6451 | ​ | ​ | ​ | ​               | ​ | 0.6651 | ​ | ​ | ​ | ​    | ​ | 0.7102 | ​ | ​ | ​ | ​   | ​ | 0.6219 | ​ | ​ |
| 2024           | ​ | ​ | ​             | ​ | 0.6934 | ​ | ​ | ​ | ​               | ​ | 0.6620 | ​ | ​ | ​ | ​    | ​ | 0.6934 | ​ | ​ | ​ | ​   | ​ | 0.6290 | ​ | ​ |
| 2025(2)        | ​ | ​ | ​             | ​ | 0.6455 | ​ | ​ | ​ | ​               | ​ | 0.6349 | ​ | ​ | ​ | ​    | ​ | 0.6895 | ​ | ​ | ​ | ​   | ​ | 0.5980 | ​ | ​ |

(1) The average of the noon buying rates on the last day of each month or portion thereof during the period. (2) Through June 20, 2025. Regulations in Australia restrict or prohibit payments, transactions and dealings with assets having a proscribed connection with certain countries or named individuals or entities subject to international sanctions or associated with terrorism.

S-36

TABLE OF CONTENTS

### VALIDITY OF SECURITIES
King & Wood Mallesons, our Australian counsel, will provide an opinion to the effect that we have duly authorized the issuance of the notes. Additionally, the validity of the notes under New York law will be passed upon for us by our New York counsel, Debevoise & Plimpton LLP, New York, New York. The validity of the notes under New York law will be passed upon for the Underwriters by their United States counsel, Sidley Austin LLP, New York, New York.

### EXPERTS
The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control Over Financial Reporting) incorporated