 RANCHO CUCAMONGA, Calif., March 08, 2021 GLOBE NEWSWIRE -- Amphastar Pharmaceuticals, Inc. NASDAQ: AMPH announced that the Company will release results for its fourth quarter of 2020 ended December 31, 2020, after the market closes on Monday, March 15th, 2021, and will hold a conference call to discuss its financial results at 2:00 p.m. Pacific Time. 