Investor Presentaiton

Segment Information [Basic Chemicals] YoY-¥2.2bn (2Q FY22: ¥14.2bn 2Q FY23: ¥12.0bn) ✓ Decreased as a result of sales volume reduction and cost increase due to shut down maintenance Product margin was unchanged in total [USD/ton] Product 2Q FY22 2Q FY23 Change Price Margin Price Margin Price Margin PX 1,174 379 1,051 427 (122) +48 MX 1,103 308 957 333 (145) +25 SM 1,295 500 1,030 406 (265) (95) [Functional Materials] YoY+¥4.8bn (2Q FY22: \8.6bn 2Q FY23: ¥13.4bn) ✓ Lubricants: Increased due to reversal of negative time-lag impact from the previous FY ✓ Performance chemicals: Decreased due to reversal of soaring market prices in some products in the previous FY ✓ Electronic materials: Decreased due to reduced sales volume resulting from current weak demand for Smartphones and OLED-TVS [Power/Renewable Energy] YoY+\2.4bn (2Q FY22: -¥2.9bn ➡2Q FY23: -¥0.4bn) ✓ Power: Improved mainly due to initiatives towards sales within self generation ✓ Solar: Improved due to cost reductions based on structural reforms and sales expansion of solar panels for self-consumption model idemitsu Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 21

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