Bank of America reiterates Buy on ASML, calling the stock's 6% drop over Chinese DUV lithography competition an overreaction to the chipmaker's

A Shanghai-based company has begun making immersion DUV lithography machines, The Information reported. ASML shares dropped 6.5%. China's share of ASML sales fell to 14%.

ASML stock tumbled on a report of competition emerging in China. It was among the biggest losers on the Philadelphia semiconductor index.