Investor Presentaiton

Forecasts for FY2023 ■Crude Oil/Coal/Exchange Rate Crude Oil (Dubai) Crude Oil (Brent)* Australian Coal Spot Price * Exchange Rate (TTM) 5/9 Forecasts Revised [USD/bbl, USD/ton, JPY/USD] Assumptions Change Forecasts (from Oct.) 80.0 83.6 +3.6 +4.5% 85.0 85.0 83.2 (1.8) (2.1%) 86.5 170.0 175.3 +5.3 +3.1% 145.0 130.0 140.5 +10.5 +8.1% 140.0 *Brent prices and Australian coal spot prices are averages based on the calendar year (Jan-Dec). ■ Consolidated Income Statement(Summary) [\billions] 5/9 Forecasts Revised Forecasts Change Net Sales Operating Income Inventory impact 8,300.0 8.650.0 +350.0 +4.2% 140.0 250.0 +110.0 +78.6% (30.0) 45.0 +75.0 Equity Income 15.0 15.0 Operating Income 155.0 265.0 +110.0 +71.0% + Equity Income Excluding inventory impact 185.0 220.0 +35.0 +18.9% Ordinary Income 150.0 270.0 +120.0 +80.0% Extraordinary Income/Losses (8.0) (17.0) (9.0) Net Income Attributable to 100.0 180.0 +80.0 +80.0% Owners of the Parent Excluding inventory impact 120.0 150.0 +30.0 +25.0% idemitsu *Gross average method of inventory valuation Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. *"Inventory impact" represents the impact of inventory valuation and the reduction in book value of inventory assets 26 26

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