Harbour Energy : Report on payments to governments for the financial year ended 31 December 2025

About this update from Harbour Energy Plc

HARBOUR ENERGY PLC ("Harbour" or the "Company") Report on Payments to Governments for the year ended 31 December 2025 Harbour today provides information in accordance with DTR 4.3A in respect of payments made by the Company to governments for the year ended 31 December 2025 and in compliance with The Reports on Payments to Governments Regulations 2014 (SI 2014/3209). This information, together with the basis of preparation, can also be found on pages 205 to 206 of the 2025 Annual Report and Financial Statements which is available to download at: harbourenergy.com/investors/ Payments by Licence Licence and hub/ company level Production entitlements Production entitlements Income taxes Royalties: cash only Dividends Bonus payments Licence fees Infrastructure improvement payments Total Country mmbbls $ million $ million $ million $ million $ million $ million $ million $ million Norway Corporate 0 0 1,901 0 0 0 0 0 1,901 PL211 0 0 0 0 0 0 1 0 1 PL211CS 0 0 0 0 0 0 1 0 1 PL248F 0 0 0 0 0 0 1 0 1 PL435 0 0 0 0 0 0 1 0 1 PL836S 0 0 0 0 0 0 1 0 1 PL248N 0 0 0 0 0 0 1 0 1 PL248G 0 0 0 0 0 0 1 0 1 PL211 + PL435 0 0 0 0 0 0 (1) 0 (1) Total 0 0 1,901 0 0 0 6 0 1,907 United Kingdom Central North Sea 0 0 0 0 0 0 10 0 10 Southern North Sea 0 0 (11) 0 0 0 3 0 (8) Corporate 0 0 1,516 0 0 0 0 0 1,516 Total 0 0 1,505 0 0 0 13 0 1,518 Germany Hemsbunde 0 0 0 3 0 0 0 0 3 Emlichheim 0 0 0 2 0 0 0 0 2 Volkersen 0 0 0 12 0 0 0 0 12 Mittelplate/Dieksand 0 0 0 51 0 0 0 0 51 Boetersen 0 0 0 1 0 0 0 0 1 Weissenmoor 0 0 0 2 0 0 0 0 2 Soehlingen 0 0 0 1 0 0 0 0 1 Staffhorst 0 0 0 1 0 0 0 0 1 Other projects 0 0 1 0 0 0 0 0 1 Total 0 0 1 73 0 0 0 0 74 Mexico Ogarrio 0 0 0 18 0 0 1 0 19 Total 0 0 0 18 0 0 1 0 19 Argentina Cuenca Austral 0 0 0 49 0 8 0 0 57 Neuquen 0 0 0 16 0 0 0 0 16 Corporate 0 0 25 0 0 0 0 0 25 Total 0 0 25 65 0 8 0 0 98 Egypt Disouq 1 36 0 0 0 0 0 0 36 East Damanhur 0 7 0 0 0 0 0 0 7 Total 1 43 0 0 0 0 0 0 43 Libya Area 58 0 26 0 0 0 0 0 0 26 Total 0 26 0 0 0 0 0 0 26 Indonesia Natuna Sea Block A 1 44 7 0 0 0 0 0 51 Total 1 44 7 0 0 0 0 0 51 Vietnam Chim Sáo 0 2 0 0 0 0 0 0 2 Corporate 0 0 15 4 0 0 0 0 19 Total 0 2 15 4 0 0 0 0 21 Total Group 2 115 3,454 160 0 8 20 0 3,757 Payments by Government Government Production entitlements Production entitlements Income taxes Royalties: cash only Dividends Bonus payments Licence fees Infrastructure improvement payments Total Country mmbbls $ million $ million $ million $ million $ million $ million $ million $ million Norway The Norwegian Tax Administration (Skatteetaten) 0 0 1,901 0 0 0 0 0 1,901 Norwegian Offshore Directorate 0 0 0 0 0 0 6 0 6 Total 0 0 1,901 0 0 0 6 0 1,907 United Kingdom HM Revenue & Customs 0 0 1,505 0 0 0 0 0 1,505 North Sea Transition Authority 0 0 0 0 0 0 13 0 13 Total 0 0 1,505 0 0 0 13 0 1,518 Germany Landesamt für Bergbau, Energie & Geologie; Hannover/Niedersachsen 0 0 0 22 0 0 0 0 22 Landesamt für Bergbau, Energie & Geologie Schleswig Holstein 0 0 0 51 0 0 0 0 51 Samtgemeinde Barnstorf 0 0 1 0 0 0 0 0 1 Total 0 0 1 73 0 0 0 0 74 Mexico Fondo Mexicano del Petróleo para la Estabilización y el Desarrollo (FMP) 0 0 0 18 0 0 0 0 18 Servicio de Administración Tributaria (SAT) 0 0 0 0 0 0 1 0 1 Total 0 0 0 18 0 0 1 0 19 Argentina Ministerio de Energía y Minería 0 0 0 41 0 0 0 0 41 Dirección Provincial de Rentas/Provincia del Neuquén 0 0 0 16 0 0 0 0 16 Agencia de Recaudación Fueguina/Provincia de Tierra del Fuego 0 0 0 8 0 8 0 0 16 Administración Federal de Ingresos Públicos 0 0 25 0 0 0 0 0 25 Total 0 0 25 65 0 8 0 0 98 Egypt Egyptian Natural Gas Holding Company (EGAS) 1 43 0 0 0 0 0 0 43 Total 1 43 0 0 0 0 0 0 43 Libya NOC Tripoli 0 26 0 0 0 0 0 0 26 Total 0 26 0 0 0 0 0 0 26 Indonesia SKK Migas 1 44 0 0 0 0 0 0 44 Directorate General of Taxes 0 0 7 0 0 0 0 0 7 Total 1 44 7 0 0 0 0 0 51 Vietnam Petro Vietnam 0 2 0 0 0 0 0 0 2 HCM Tax Department 0 0 15 2 0 0 0 0 17 Vung Tau Customs office 0 0 0 2 0 0 0 0 2 Total 0 2 15 4 0 0 0 0 21 Total Group 2 115 3,454 160 0 8 20 0 3,757 Enquiries: Harbour Energy plc Tel: 020 7730 1111 Elizabeth Brooks, SVP Investor Relations

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