A Decade After Losing 35% of Its Wafers, This Japanese Stock Is Back in the Quake Zone

Renesas Electronics stock has nearly returned to its pre-earthquake level, even as investors await confirmation that its Kawashiri factory restarted as planned. The Japanese chipmaker halted the Kumamoto plant after a magnitude 7.1 earthquake on July 28.

The comparison with 2016 is unusually direct. A quake at the same plant then affected 35% of its wafers and cut sales by an estimated ¥14 billion. Renesas now expects a faster recovery. The new quake tests whether a decade of resilience spending can prevent another earnings shock.

What Happened at the Kawashiri Factory

The quake struck at 16:27 local time, after Tokyo markets had closed. At Kawashiri, Renesas reported wall cracks, water leakage, and a temporary halt to its pure-water supply.

That last detail matters. Chip fabs rinse wafers with ultrapure water, so a break in supply can stop production even when power and the cleanroom hold.

Renesas said equipment and wafers still in production were under review. Its nearby Nishiki factory returned to pre-quake capacity on July 31.

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