Financial Results for Nine Months Ended December 31, 2023

II. Financial Results for the Nine Months Ended December 31, 2023 1-3Q FY3/24 Results (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 JAPEX 1-3Q FY3/23 (a) 1-3Q FY3/24 (a) Change 225,105 229,938 +4,833 +2% 63,888 62,745 (1,143) (2%) 38,742 39,868 +1,125 +3% 57,878 48,162 (9,716) (17%) 43,286 36,515 (6,771) (16%) 1-3Q FY3/23 (a) 1-3Q FY3/24 (a) Change USD/bbl 98.27 77.46 (20.81) USD/bbl 106.81 86.26 (20.55) JPY/USD 132.69 141.98 +9.29 Copyright 2024 Japan Petroleum Exploration Co., Ltd. (JAPEX) All Rights Reserved. 6

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