6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

August 12, 2025

Commission File Number 1-10167

WESTPAC BANKING CORPORATION

(Translation of registrant’s name into English)

275 KENT STREET, SYDNEY, NEW SOUTH WALES 2000, AUSTRALIA

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports

under cover of Form 20-F or Form 40-F.

Form 20-F x                         Form 40-F ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Incorporation by Reference

The information contained in this Report on Form 6-K, excluding the information set forth in Exhibit 1, shall be incorporated by reference in the prospectuses relating to the Registrant’s securities contained in the Registrant’s Registration Statements on Form F-3 (File Nos. 333-283007 and 333-283008), as such prospectuses may be amended or supplemented from time to time.

Appointment of Chief Executive,Consumer

Westpac today announced the appointment of Carolyn McCann to the position of Chief Executive, Consumer, effective immediately.

Ms McCann brings almost thirty years of corporate experience, including two decades in the banking and insurance industries and more than a decade at Westpac. She has been Acting Chief Executive, Consumer since May 12, 2025. Previously, she was Group Executive, Customer and Corporate Services, responsible for Westpac’s operations, scams and fraud prevention, customer collections and hardship, property resilience, corporate affairs and marketing.

Index to Exhibits

Disclosure regarding forward-looking statements

The information contained in this Report on Form 6-K contains statements that constitute “forward-looking statements” within the meaning of section 21E of the U.S. Securities Exchange Act of 1934.

Forward-looking statements are statements that are not historical facts. Forward-looking statements appear in a number of places in this Report and include statements regarding our current intent, belief or expectations with respect to our business and operations, macro and micro economic and market conditions, results of operations and financial condition and performance, capital adequacy and liquidity and risk management, including, without limitation, future loan loss provisions and financial support to certain borrowers, forecasted economic indicators and performance metric outcomes, indicative drivers, climate- and other sustainability- related statements, commitments, targets, projections and metrics, and other estimated and proxy data.

Words such as ‘will’, ‘may’, ‘expect’, ‘intend’, ‘seek’, ‘would’, ‘should’, ‘could’, ‘continue’, ‘plan’, ‘estimate’, ‘anticipate’, ‘believe’, ‘probability’, ‘indicative’, ‘risk’, ‘aim’, ‘outlook’, ‘forecast’, ‘assumption’, ‘projection’, ‘target’, ‘goal’, ‘guidance’, ‘objective’, ‘ambition’ or other similar words, are used to identify forward-looking statements. These statements reflect our current views on future events and are subject to change, certain known and unknown risks, uncertainties and assumptions and other factors which are, in many instances, beyond our control (and the control of our officers, employees, agents and advisors), and have been made based on management’s current expectations or beliefs concerning future developments and their potential effect upon Westpac.

Forward-looking statements may also be made, verbally or in writing, by members of Westpac’s management or Board in connection with this Report. Such statements are subject to the same limitations, uncertainties, assumptions and disclaimers set out in this Report.

There can be no assurance that future developments or performance will align with our expectations or that the effect of future developments on us will be those anticipated. Actual results could differ materially from those we expect or which are expressed or implied in forward-looking statements, depending on various factors including, but not limited to, those described in the section titled ‘Risk factors’ in Westpac’s 2025 Interim Financial Report on Form 6-K filed with the U.S. Securities and Exchange Commission. When relying on forward-looking statements to make decisions with respect to us, investors and others relying on information in this Report should carefully consider such factors and other uncertainties and events.

Except as required by law, we assume no obligation to revise or update any forward-looking statements in this Report, whether from new information, future events, conditions or otherwise, after the date of this Report.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit 1

12 August 2025

Appointment of Chief Executive, Consumer

Westpac today announced the appointment of Carolyn McCann to the position of Chief Executive, Consumer, effective immediately.

Ms McCann brings almost thirty years of corporate experience, including two decades in the banking and insurance industries and more than a decade at Westpac. She has been Acting Chief Executive, Consumer since 12 May 2025. Previously, she was Group Executive, Customer and Corporate Services, responsible for Westpac’s operations, scams and fraud prevention, customer collections and hardship, property resilience, corporate affairs and marketing.

“Carolyn is an outstanding executive and I’ve seen firsthand her ability to engage and galvanise high-performing teams to deliver results,” said Westpac CEO Anthony Miller.

“Under Carolyn’s leadership, Westpac’s operations teams have dramatically improved customer outcomes, including mortgage processes, where decision times have been reduced from twelve to five days. Scam protection has been significantly upgraded with market leading solutions reducing losses by 40 per cent, and complaints handling processes have been transformed.

“Carolyn has brought these outstanding leadership skills to the Consumer role, where she leads a team of highly experienced retail banking executives as well as our superb employees across the country. Carolyn’s drive, vision and determination will be an asset to the bank in this role.

“With the right mix of experience, professionalism, teamwork and energy, we now have the team in place to lead Westpac and I’m excited for what we can achieve together.”

For further information:

This document has been authorised for release by Tim Hartin, Company Secretary.