Sumco Corporation (3436.T) fair value

ACCE thesis

Sumco makes polished silicon wafers, the bare substrates that chipmakers etch into logic and memory devices, and it is one of only a handful of companies with the crystal-growth and polishing know-how to supply leading-edge customers at scale. The structural case rests on that concentration: wafer supply is an oligopoly with high qualification barriers, so pricing and volume tend to follow the capacity cycle rather than the spot market. The near-term question is whether the current downturn in wafer demand bottoms before the forward multiple (48.5x) has to compress further, given that gross margin has fallen to 9.3% and operating margin is negative at -2.7%. Revenue is still growing 10.4%, but a negative ROE of -4.1% means the business is not yet earning its cost of capital through the trough. This is a name where the thesis depends on the timing of the wafer cycle, so it merits a deeper look at capacity utilization and customer inventory levels before any view on earnings recovery.