Investor Presentaiton

Topics Affecting Progress on the Medium-term Plan (1/4) Progress on the Medium-term Plan Commenced cooperation toward mass production of all-solid-state batteries for BEVS with Toyota ✓ Working together in developing mass production technology of solid electrolytes, improving productivity and establishing a supply chain ✓ Seeking the successful commercialization of all-solid-state batteries in 2027-28, followed by full-scale mass production TOYOTA Fidemitsu H2 NH3 Picture of joint press conference (Link to our disclosure document) https://www.idemitsu.com/en/content/100043691.pdf idemitsu Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 32 32

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