LONDON–(BUSINESS WIRE)– As Agent Bank, please be advised of the following rate determined on: 9/15/2026 Issue ¦ Westpac Banking Corporation Series 1595 GBP 250,000,000 FRN due March 2027 ISIN Number ¦ XS3323666373 ISIN Reference ¦ 332366637 Issue Nomin GBP ¦ 250000000 Period ¦ 6/22/2026 to 9/22/2026 Payment Date 9/22/2026 Number of Days ¦ 92 Rate ¦ 4.1478 Denomination GBP ¦ 100000 ¦ 250000000 ¦ Amount Payable per Denomination ¦ 1045.47 ¦ 2613675 ¦ Bank of New York