Company: WEBNF
Filing Date: 2025-06-26
Form Type: 424B5
Source: 0001104659-25-062718
Chunk: 1

Company: WESTPAC BANKING CORP
Filing Date: 2025-06-26
Form: 424B5
Chunk 1
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 rate notes, and the floating rate notes will constitute a separate series of Senior Debt Securities described in the accompanying prospectus. In some jurisdictions, regulatory authorities have adopted or published laws, regulations or guidance that limit or prohibit the offer or sale of securities such as these notes to certain types of investors. By purchasing, or making or accepting an offer to purchase, these notes from us and/or the underwriters in the United States, each prospective investor represents, warrants, agrees with and undertakes to us and to each underwriter that it qualifies as a “qualified institutional buyer” as defined in Rule 144A of the Securities Act of 1933, as amended, which we refer to as the Securities Act. See “Plan of Distribution” in the accompanying prospectus. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense. Investing in the notes involves risks. To read about certain factors you should consider before investing in the notes, see “Forward-Looking Statements” on page S-vand “Risk Factors” beginning on page S- 6of this prospectus supplement, and the risk factors set forth in our U.S. Interim Financial Results Announcement for the half-year ended March 31, 2025 filed with the Securities and Exchange Commission on Form 6-K, dated May 6, 2025, which we refer to as our 2025 U.S. Interim Results Announcement, and which is incorporated by reference in this prospectus supplement and the accompanying prospectus. The notes are not protected accounts or deposit liabilities of Westpac Banking Corporation for the purposes of the Banking Act 1959 of Australia, which we refer to as the Australian Banking Act, or any other purpose. Neither the notes, nor any obligations of Westpac Banking Corporation under the notes, are insured by the United States Federal Deposit Insurance Corporation, covered under the Australian Financial Claims Scheme, or guaranteed or insured by any other governmental agency or instrumentality of the United States, Australia or any other jurisdiction.

| ​                                     | ​ | ​ | Per FixedRate Note |   |          |   | ​ | ​ | Total for FixedRate Notes | ​ | ​ | Per FloatingRate Note |   |          |   | ​ | ​ | Total for FloatingRate Notes | ​ |
| Public Offering Price(1)              | ​ | ​ | ​                  | ​ |