Company: WEBNF
Filing Date: 2025-06-26
Form Type: 424B5
Source: 0001104659-25-062718
Chunk: 3

Company: WESTPAC BANKING CORP
Filing Date: 2025-06-26
Form: 424B5
Chunk 3
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 ​ | ​    | ​ | 19 | ​ | ​ |
| PLAN OF DISTRIBUTION (CONFLICTS OF INTEREST)                            | ​ | ​ | ​    | ​ | 29 | ​ | ​ |
| WHERE YOU CAN FIND MORE INFORMATION                                     | ​ | ​ | ​    | ​ | 31 | ​ | ​ |
| INCORPORATION OF INFORMATION WE FILE WITH THE SEC                       | ​ | ​ | ​    | ​ | 31 | ​ | ​ |
| ENFORCEABILITY OF FOREIGN JUDGMENTS IN AUSTRALIA                        | ​ | ​ | ​    | ​ | 32 | ​ | ​ |
| CURRENCY OF PRESENTATION AND EXCHANGE RATES                             | ​ | ​ | ​    | ​ | 32 | ​ | ​ |
| VALIDITY OF SECURITIES                                                  | ​ | ​ | ​    | ​ | 33 | ​ | ​ |
| EXPERTS                                                                 | ​ | ​ | ​    | ​ | 33 | ​ | ​ |
| LIMITATION ON INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM’S LIABILITY | ​ | ​ | ​    | ​ | 34 | ​ | ​ |

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TABLE OF CONTENTS

### IMPORTANT NOTICES
You should rely only on information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus and any free writing prospectus with respect to the offering of the notes filed by us with the Securities and Exchange Commission, which we refer to as the SEC. We have not, and the underwriters have not, authorized anyone to provide you with different or additional information. If anyone provides you with different, additional or inconsistent information, you should not rely on it. You should assume that the information in this prospectus supplement, the accompanying prospectus and any free writing prospectus with respect to the offering of the notes filed by us with the SEC and the documents incorporated by reference herein and therein is only accurate as of the respective dates of such documents. Our business, financial condition, results of operations and prospects may have changed since those dates.

We are offering to sell, and are seeking offers to buy, the notes only in jurisdictions where offers and sales of the notes are permitted. The distribution of this prospectus supplement and the accompanying prospectus and the offering of the notes in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement and the accompanying prospectus must inform themselves about and observe any restrictions relating to the offering of