FAQs on reported JSR acquisition developments

This report addresses investors' FAQs on reported JSR acquisition developments. Bloomberg reported on September 18 that Mitsubishi Chemical and Mitsui Chemicals are the final candidates to acquire JSR. On synergies: Mitsubishi Chemical handles polymers, a raw material for photoresists; its subsidiary Gelest handles precursors for dry-type MOR used in EUV, and in July 2022 Gelest, Lam Research and Entegris announced an EUV precursors partnership. JSR and Lam Research had disputed MOR-related patents since October 2022, but in September 2025 JSR withdrew its patent challenge and agreed to a cross-license covering MOR and other areas;