Applied Materials Inc., the largest US maker of chipmaking machinery, slid in late trading following a report that it faces a US criminal investigation for allegedly violating export restrictions to China.

The company is being probed by the Justice Department over dealings with China’s biggest chipmaker, Semiconductor Manufacturing International Corp., according to Reuters. The department is looking at whether Applied Materials sold hundreds of millions of dollars of equipment without the proper licenses, the news outlet reported, citing unidentified people familiar with the situation.