NZD/AUD FX rate for interim dividend

The foreign exchange rate used for Mercury’s FY2026 interim dividend paid to Australian investors in Australian Dollars (NZD/AUD) has been set at 0.8309. The dividend will be paid on 1 April 2026. Attached is an updated Appendix 3A.1 (Notification of Dividend / Distribution) disclosed on the ASX today. ENDS Howard Thomas General Counsel and Company Secretary Mercury NZ Limited For investor relations queries, please contact: Paul Ruediger Head of Business Performance & Investor Relations 027 517 3470 investor@mercury.co.nz For media inquiries, please contact: Catherine Morab Reputation and Social Impact Lead 027 210 5337 mercurycommunications@mercury.co.nz