AMSTERDAM, Feb 15 (Reuters) - ASML Holding NV, a top supplier of semiconductor manufacturing equipment, on Wednesday disclosed that it had recently discovered the "misappropriation" of confidential information by a now-dismissed employee in China.

"Based upon our initial findings, we do not believe that the misappropriation is material to our business," the company said in a statement, adding that it had informed relevant authorities of the incident. (Reporting by Toby Sterling; editing by Jason Neely)