U.S. Commerce Secretary Howard Lutnick warned ASML that an advanced EUV lithography machine may have reached China. U.S. officials outlined these concerns to the Dutch chip-equipment manufacturer during several meetings. ASML denied the allegations, stating it never shipped EUV systems or specific components to China.

ASML maintains a global monopoly on EUV systems essential for advanced semiconductor production. U.S.-led export controls currently prohibit the sale of these machines to China.

ASML stock fell 1.79% intraday following the report. Investors are weighing potential regulatory implications despite the lack of public evidence.