Key Product
EUV photoresist, compound semiconductors
Supplies To
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Sumitomo Chemical is a key supplier of EUV photoresist — the light-sensitive material applied to wafers during EUV lithography that defines the patterns of transistors and interconnects. The EUV photoresist market is highly concentrated among a small number of Japanese and Belgian suppliers, with Sumitomo holding a significant share. The company also manufactures compound semiconductors and specialty chemicals used throughout the chipmaking process. Japan's role as the dominant supplier of photoresist gives it significant leverage in semiconductor supply chain diplomacy, and Sumitomo's materials are present in the production of virtually every leading-edge AI chip.