A reported dispute between U.S. officials and ASML has put one of the world’s most important chipmaking tools back at the center of the AI supply chain debate. The issue is narrow but consequential: whether an extreme ultraviolet lithography machine, known as an EUV system, may have ended up in China despite export controls.
ASML rejects that idea. The company says no EUV machine is in China and that none has ever been there. U.S. officials, according to Bloomberg, say they have evidence involving EUV-related components and transport equipment, but they have not made that evidence public.
What the U.S. is reportedly alleging
According to Bloomberg, U.S. Commerce Secretary Howard Lutnick has raised the concern in a series of recent meetings with senior ASML executives. The concern is that one of ASML’s EUV systems may have reached China.
That would matter because ASML has been barred from selling EUV machines to China since the first Trump administration. The machines are central to printing the most advanced semiconductor patterns, and there is no second supplier for EUV lithography systems.
Senior administration officials told Bloomberg they have evidence that ASML shipped EUV-related components and transport equipment to China. But they have repeatedly declined to show that evidence to Bloomberg, and apparently to ASML as well. The Commerce Department did not answer Bloomberg’s questions about whether it has evidence that an actual EUV system is on Chinese soil.
Why ASML sits at the center of advanced chips
ASML is a Dutch company, but its role in the global AI buildout is unusually large. It makes the only machines capable of EUV lithography, the process used to print the tiny circuit patterns required for the most advanced chips.
Those tools matter to the companies behind today’s cutting-edge processors. Every advanced processor made by TSMC, including chips for Nvidia and Apple, depends on ASML tools. The company spent roughly two decades and untold billions developing that capability.
The result is a rare kind of industrial position: ASML has a monopoly over one of the key production steps for the most advanced semiconductors. That has helped make it Europe’s most valuable public company, with a market capitalization trading in the neighborhood of $700 billion as of this week, supported by strong AI-driven demand for chips.
ASML’s defense rests on tracking and access controls
ASML CEO Christophe Fouquet said six weeks ago that the company tracks every machine it has ever shipped. According to his account, those systems are either in active use with monitored customers or have been dismantled and returned to ASML.
Fouquet also described an internal firewall built years ago. Employees who can access EUV technology, documentation, and training are separated from those who cannot. ASML’s China-based staff are kept outside that EUV access group by design.
His broader argument is technical as well as procedural. He said ASML could build an EUV system because 80% of it already came from decades of prior knowledge, while the truly new challenge, generating EUV light itself, took 20 years. In that framing, reverse-engineering a machine is not realistic if the machine was never available in the first place.
The China business creates its own tension
ASML does sell older-generation deep ultraviolet tools, known as DUV systems, to China. Fouquet described that business as a protective calculation rather than a loophole. The idea is to keep a generational gap while still allowing permitted sales.
The commercial stakes are substantial. ASML expects roughly 20% of its 2026 revenue to come from already-permitted sales to China. A breach involving EUV would risk that business and the company’s standing in European industry.
That does not settle the allegation. The government has not made its evidence public, and the company’s denial does not by itself prove the concern is wrong. For now, the core facts are that U.S. officials are pressing the issue, ASML says the machine is not there, and the public has not seen evidence of an actual EUV system in China.
Policy pressure is building around lithography
The dispute is unfolding alongside broader pressure on the future of lithography. The Commerce Department, under Lutnick’s leadership, agreed late last year to put up to $150 million of taxpayer money into xLight, a startup working on next-generation light-source technology.
xLight’s CEO has said the company sees itself as a future partner to ASML rather than a rival. Its hardware is meant to plug into ASML’s machines, not replace them. When that framing was put to Fouquet in May, he was polite but unconvinced, making clear that ASML does not view xLight’s technology as necessary to preserve its lead.
Nothing public connects that investment to Lutnick’s scrutiny of ASML. Still, the overlap is notable: a federal official is examining a monopoly while his agency has money committed to a startup working near the core of that monopoly’s technology.
xLight is not the only outside bet. Peter Thiel has backed Substrate, a separate startup pursuing EUV-rival technology and aiming more directly at competition with ASML than xLight says it intends.
Congress may also widen the fight. Bloomberg notes that a bipartisan bill moving through Congress would go beyond EUV by calling for an effective ban on all ASML DUV shipments to China. Those less advanced lithography tools account for roughly a fifth of ASML’s expected 2026 revenue. The bill cleared a key committee in April, and the Trump administration has not taken a formal position on it.
The immediate question is factual: did an EUV system, or meaningful EUV-related equipment, reach China? The larger issue is strategic. ASML’s machines sit at the point where AI demand, export controls, China policy, and the economics of semiconductor manufacturing all meet.