US officials claim ASML's most advanced EUV lithography tool may have ended up in China, a potential violation of export controls; ASML denies the allegation. The dispute puts ASML's critical export licenses and its relationship with US regulators at the center of attention, with meaningful downside risk if the claim is substantiated.
ASML's own commercial logic is a strong structural defense — the company's entire revenue model depends on US export license cooperation, making a deliberate violation deeply irrational, and management's flat denial adds credibility in the absence of US evidence made public.
If US authorities have physical or intelligence evidence of an EUV tool in China, even an inadvertent chain-of-custody breach could trigger a BIS review of ASML's export privileges, a risk that is not yet priced into the stock given the lack of a visible sell-off catalyst so far.