TL;DR
ASML fell 6.5% after The Information reported a Shanghai company is mass-producing DUV lithography tools. China's share of ASML sales dropped to 14% in Q2 from 19% in Q1.
ASML shares fell as much as 6.5% in Amsterdam on Monday after The Information reported that a Shanghai-based company has begun mass-producing immersion deep ultraviolet lithography tools. The machines are the type that ASML has been restricted from selling to China under Dutch and US export controls. If the report is accurate, it represents exactly the outcome the controls were designed to prevent: China building the capability domestically because it can no longer buy it.
ASML did not immediately respond to a request for comment. China's contribution to ASML's net system sales fell to 14% in the second quarter from 19% in Q1. The declining share reflects both the tightening of export restrictions and the possibility that Chinese chipmakers are finding alternative supply. China was still ASML's biggest market earlier this year, but the relationship has been eroding quarter by quarter as the Dutch government, under US pressure, curtails shipments of its NXT:2050i and NXT:2100i systems.
DUV lithography is not cutting-edge by ASML's standards. The company's most advanced tools use extreme ultraviolet (EUV) technology, which China cannot replicate and has never been allowed to purchase. But DUV machines are sufficient to produce the chips used in the vast majority of electronics, from cars to smartphones to AI inference accelerators. A domestic Chinese DUV capability would undermine the commercial case for ASML's China sales without closing the technological gap at the frontier.
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The US wants to cut off China's chip equipment entirely, and the MATCH Act would force the Netherlands and Japan to align DUV restrictions with US rules within 150 days. If China can now build its own DUV tools, the leverage those restrictions provide diminishes. ASML's stock reaction reflects a market recalculating how much of the company's China revenue is at risk not from regulation, but from replacement. The export controls were supposed to slow China down. They may have given it a reason to build faster.