PTTEP Operations Overview

Results - Net Income Impressive recurring net income curbed by oil price hedging loss Q2/21 on Q1/21 (QoQ) Unit: million USD 376 222 94 349 282 Q1/21 Q2/21 -127 Recurring NI Non recurring NI -Net Income 6M2021 on 6M2020 (YTD) Unit: million USD 598 409 418 631 6M2020 Recurring NI 6M2021 Non recurring NI -33 Net Income Recurring (+67 MMUSD or +24%) +16% Mainly from Oman Block 61 Sales Volume and Sabah H $ Average Selling Price +4% Higher liquid price Recurring (+213 MMUSD or +51%) +20% $ Increase from Gulf of Thailand, Sales Volume Sabah H, and Oman Block 61 Average Selling Price -10% +3% Higher liquid price offset with lower gas price ◉-3% $ Lower unit costs Non-recurring (-221 MMUSD or ->100%) Higher oil price hedging loss in Q2, and realization of gain from bargain purchase offset with exploration asset write-off in Q1 $ Lower unit costs Non-recurring (-24 MMUSD or ->100%) Higher oil price hedging loss offset with a gain from bargain purchase in 2021 17 PTTEP Energy Partner of Choice

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