ASML shares slide on a report that China has begun mass producing DUV lithography tools

Shares in the Dutch group ASML, the world's largest maker of chipmaking lithography machines, fell about 8.4 percent in Amsterdam on Monday, 27 July 2026, making it the heaviest drag on Europe's technology sector.

The decline followed a report that a Shanghai based, state backed company has begun mass producing immersion deep ultraviolet (DUV) lithography tools. According to the report, the company plans to build about five systems this year and around 20 in 2027, well below the 131 immersion DUV systems ASML produced last year. Investors nonetheless read the news as an early sign of domestic substitution taking hold in China.