Rigaku Holdings Corporation — AI supply-chain exposure

Rigaku is a Japanese instrumentation maker specialising in X-ray technology — metrology, diffraction and inspection tools that measure the thickness, composition and crystalline structure of thin films. Inside a fab, those measurements are how engineers confirm that each deposited layer landed within spec, which places Rigaku among the process-control equipment that sits alongside the big deposition and lithography systems.

Its structural role is tied to yield — the share of chips on a wafer that come out working. As transistors shrink and layer stacks grow taller, the tolerance for error narrows, and manufacturing blind, without film-level X-ray inspection, becomes untenable. Rigaku is a specialist supplier rather than a chokepoint, one vendor among several in metrology, but its niche makes it quietly exposed to every leading-edge node that adds more layers to measure.