Financial Results for Nine Months Ended December 31, 2023

II. Revised Financial Forecasts for the fiscal year ending March 31, 2024 FY3/24 Forecasts (vs Nov. 10 Forecasts) Million Yen Net sales Gross profit Operating profit Ordinary profit Profit attributable to owners of parent Oil Price and Exchange Rate JAPEX Previous (f) Nov. 10, 2023 Revised (f) Feb. 9, 2024 Change 325,400 330,700 +5,300 +2% 83,800 84,200 +400 +0% 48,800 50,700 +1,900 +4% 57,000 59,100 +2,100 +4% 45,000 45,000 WTI Crude oil price (CIF) Exchange rate Previous (f) Nov. 10, 2023 Revised (f) Feb. 9, 2024 Change USD/bbl 77.46 75.60 (1.86) USD/bbl 84.35 84.74 +0.39 JPY/USD 139.51 141.42 +1.91 Copyright 2024 Japan Petroleum Exploration Co., Ltd. (JAPEX) All Rights Reserved. 12

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