Investor Presentaiton

Key Topics Trends in Petroleum Demand and Sales ✓ Demand for core products, particularly gasoline, has stabilized after recovery from reduction under COVID-19 ✓ Jet fuel demand has remained on a recovery trend since FY2020 FY2020 FY2021 FY2022 2Q FY2023 Core products 94.6% 98.6% 100.9% 98.0% Gasoline 90.4% 99.6% 101.3% 98.5% Jet fuel 54.2% 126.0% 136.8% 108.3% *Idemitsu sales growth rate (y-o-y) ■ Situation of Nghi Son Refinery in Vietnam ✓ Almost break-even at the operating profit level in 1H; forecasting positive profits for the full fiscal year ✓ Regular maintenance was completed as planned; anticipating earnings improvement in the next fiscal year due to enhanced productivity, etc. ✓ Continuing constructive discussions between sponsors to pursue further earnings improvement idemitsu Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 15

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