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Appendix Tuna, Indonesia: significant resource potential ■ Premier 50 per cent¹ interest, operator ■ Premier discovered Tuna in 2014 ■ 104 mmboe gross 2C resource, as per RISC CPR IRR 28% VIETNAM PremierOil Vung Tau NCS Pipeline Chim Sáo Gas Export- 12W Chim Sáo / Dua to Vung Tau ■ Farm down to Zarubezhneft subject to govt approval ■ 2021 two appraisal wells (Premier carried) ■ WHP tied back to FPSO; gas pipeline to Vietnam <3 years payback Natuna Sea Block A MALAYSIA MOU signed for sale of Tuna gas to Vietnam - 115 mmscfd for 5 years; 300 BCF commitment - Gas pricing of 12% Brent ($7/9/mmbtu floor/cap) ■ First gas targeted for 2025 $555m net FCF (2026-2029) Indicative production profile kboepd (net¹) Singapore 'WNTS to Singapore 540km Shuttle Tanker Tuna FPSO Current field development plan 1Reflects post farm down equity November 2020 Sales Gas Pipeline Tuna Wellhead Platform Infield Flowines And Umbilical Future Prospects And Leads 15 10 5 Kakap Tuna discovery INDONESIA VIETNAM MALAYSIA KALIMANTAN ■ Oil Gas !!!!! 0 2025 2026 2027 2028 2029 2030 P23

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