Investor Presentaiton

Growing set of attractive, international growth projects... ...with the potential to materially add to our reserves and production and diversify our portfolio overtime Mexico: Zama c.95 mmboe 2C ■ 12.4% non-operated interest ■ FDP approved FEED planned for 2024 ahead of potential Final Investment Decision Harbour Energy Norway Indicative reserve additions mmboe ■ Small gas discovery at Ametyst Drilling at Ringhorne ongoing 519 Mexico Zama Active efforts ■ 50% operated interest Indonesia: Tuna ■ Initial plan of development approved Progress impacted by EU/UK sanctions c.55 mmboe 2C to mature into 2P Kan 361 Tuna Layaran Mexico: Block 30 c.30 mmboe 2C ■ 30% non-operated interest ■ Kan-1 discovery in April 2023 ■ Kan appraisal plan approved; drilling expected H2 2024 Indonesia: Andaman c.130 mmboe 2C ■ Play opening Timpan-1 gas discovery (2022) Significant discovery at Layaran-1 (2023) ■ Low gas saturation at Halwa; Gayo small discovery (2024) Drilling Tangkulo prospect next Harbour Energy | Investor Presentation Indonesia Timpan J-Area RF UK infill Other UK UK YE 2023 2P reserves YE 2023 2C resources 15

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