LONDON–(BUSINESS WIRE)– As Agent Bank, please be advised of the following rate determined on: 11/13/2026 Issue ¦ Westpac Banking Corporation Series No 1581 GBP 255,000,000 FRN due November 2026 ISIN Number ¦ XS3236034131 ISIN Reference ¦ 323603413 Issue Nomin GBP ¦ 255000000 Period ¦ 8/20/2026 to 11/20/2026 Payment Date 11/20/2026 Number of Days ¦ 92 Rate ¦ 4.1212 Denomination GBP ¦ 100000 ¦ 255000000 ¦ Amount Payable per Denomination ¦ 1038.77 ¦ 2648863.5 ¦ Bank