Layer 6 · 4186 — Tokyo Ohka Kogyo (TOK)
Live: price not surfaced (needs manual check on Yahoo 4186.T) JPY · Earnings (last): Q1 2026 — rev surprise +5.90%, EPS beat consensus; guide neutral · Next earnings: 2026-05-13 (release reference; verify on next report) · Conviction: 4/10
Bottleneck context
TOK is one of three Japanese photoresist majors (with JSR and Shin-Etsu Chemical) and one of the few EUV photoresist suppliers globally. EUV photoresist is the chemistry layer that enables sub-7nm patterning — without it, the AI logic node ramp stops. Real bottleneck, real moat. Feb 2026 partnership with Irresistible Materials extends the EUV roadmap, and Q1 revenue beat by 5.9% confirms underlying franchise health.
Why Tier C
The problem is competitive intensity at the EUV layer itself — JSR, Shin-Etsu and Fujifilm all serve the same TSMC/Samsung/Intel customer set, and customer share is closely guarded. With the price not surfaced in our refresh, we cannot underwrite valuation, and a neutral guide direction suggests management does not expect the next leg to come from EUV mix in the next quarter. Decent franchise, no near-term catalyst, no verified price — exactly the C-tier setup.
Watch trigger
Next print shows EUV resist disclosed as > 25% of revenue AND price surfaces below ~JPY 11,000 for an acceptable entry.
Position guidance
No position. Verify price first; reassess on next earnings.