Financial Results for Nine Months Ended December 31, 2023

II. Revised Financial Forecasts for the fiscal year ending March 31, 2024 FY3/24 Forecasts (Year-on-Year) Million Yen Net sales Gross profit Operating profit Ordinary profit Profit attributable to owners of parent Oil Price and Exchange Rate WTI Crude oil price (CIF) Exchange rate Copyright 2024 Japan Petroleum Exploration Co., Ltd. (JAPEX) All Rights Reserved. JAPEX FY3/23 (a) FY3/24 Revised (f) Change 336,492 330,700 (5,792) (2%) 96,111 84,200 (11,911) (12%) 62,085 50,700 (11,385) (18%) 83,130 59,100 (24,030) (29%) 67,394 45,000 (22,394) (33%) FY3/23 (a) FY3/24 Revised (f) Change USD/bbl 94.42 75.60 (18.82) USD/bbl 102.26 84.74 (17.52) JPY/USD 132.86 141.42 +8.56 17

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