LONDON–(BUSINESS WIRE)– As Agent Bank, please be advised of the following rate determined on: 10/9/2026 Issue ¦ Westpac Banking Corporation Series No 1538 USD 15,000,000 FRN Due in Jan 2034 ISIN Number ¦ XS2751583050 ISIN Reference ¦ 275158305 Issue Nomin USD ¦ 15000000 Period ¦ 7/20/2026 to 10/19/2026 Payment Date 10/19/2026 Number of Days ¦ 91 Rate ¦ 4.76252 Denomination USD ¦ 200000 ¦ 15000000 ¦ Amount Payable per Denomination ¦ 2407.72 ¦ 180579 ¦ Bank of New Y