Investor Presentaiton

[USD/bbl] 120.0 Operating Environment Dubai Crude Australian Coal Oil Price [USD/ton] 450.0 Spot Price FY2023 FY2022 420.0 420.7 [JPY/USD] Exchange Rate (USD) 150.0 390.0 110.0 145.0 144.6 376.8 379.5 108.1 360.0 330.0 137.4 138.4 100.0 140.0 300.0 96.9 270.0 263.7 90.0 86.7 84.8 210.0 135.0 247.8 240.0 80.0 177.8 180.0 80.3 160.7 150.0 70.0 4 5 6 7 8 9 10 11 12 1 2 3 idemitsu 141.6 132.3 130.0 129.6 147.8 120.0 125.0 1 2 3 4 5 6 7 8 9 10 11 12 4 5 6 7 8 9 10 11 12 1 2 3 Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 16

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