The US can block exports of American chipmaking tools, but it does not make all the tools that matter. The world’s only maker of EUV lithography machines is ASML in the Netherlands. Japan’s Tokyo Electron is a top supplier of the coating, etching and deposition systems found in every advanced fab. Without the Netherlands and Japan on board, US equipment controls on China would leak badly. Both countries did sign on, starting in 2023.

A report that a Chinese state-backed company has begun manufacturing deep ultraviolet lithography machines took ASML down more than seven percent, Applied Materials down six and a half, and Lam Research down seven. By the time Korean markets opened, Samsung Electronics was off more than eleven percent, SK Hynix more than twelve, and the KOSPI more than nine. The sequence looks like one story propagating outward from a single headline. It is at least two stories, and the market priced them as if they were the same one.