Facility

TOK Koriyama Plant (Fukushima) — EUV/ArF

Operated by Tokyo Ohka Kogyo (TOK)JP · Fukushima Prefecturemanufacturing

Tokyo Ohka Kogyo primary EUV and ArF photoresist manufacturing plant in Koriyama City, Fukushima Prefecture. Major ¥200B+ expansion underway; new building operational H2 2026 (will be TOK's largest plant). Suspended after April 20, 2026 magnitude 7.7 earthquake; 4-8 week resumption estimate. Combined with Shin-Etsu Shirakawa, Fukushima region disruptions represent ~25% of global advanced photoresist capacity at risk from a single seismic event. Source: https://www.trendforce.com/news/2026/04/21/news-kioxia-tel-and-photoresist-makers-in-focus-after-magnitude-7-7-japan-earthquake-supply-chain-impact-mixed/

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