TOK expands Koriyama photoresist capacity as AI chip demand rises

TOK's Koriyama photoresist expansion is not a capacity play—it is a strategic lock on pricing power in the AI materials arms race. AI accelerators demand 40-60% more lithography steps per wafer than conventional CPUs, and High-NA nodes push purity and defect-density requirements for positive-tone resists to exponential levels. The bottleneck is shifting from equipment to materials. Geographically, Koriyama sits deliberately far from Taiwan, China and mainland coastal fabs, layered with post-Fukushima radiation monitoring. TOK is engineering geographic redundancy. Meanwhile, the US CHIPS Act funnels subsidies into equipment and fabrication, leaving the materials layer almost entirely unsubsidized—handing Japanese suppliers structural pricing leverage. Competitively, JSR and Shin-Etsu will likely mirror this expansion within 2025, while Entegris accelerates its US-based pilot line to fracture the Japanese duopoly. TOK's window is roughly 12-18 months before parity erodes. The 12-24 month tail: simultaneous ramp of 2nm GAA and HBM4 stacking will push photoresist consumption past historical peaks. New capacity takes 18-24 months to qualify. A structural shortage in H2 2026 is probable. TOK is not chasing demand—it is pre-positioning to set the price.