Investor Presentaiton

Product market price Styrene Monomer-Naphtha (price and spread) [Price :USD/ton] 1,600 SM spread -Naptha 1,400 1,200 -SM 1,000 800 600 400 200 0 Apr-19 Apr-20 Apr-21 Apr-22 idemitsu [Spread USD/ton] 800 700 600 500 400 300 200 100 0 Apr-23 Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 55 59

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