 RANCHO CUCAMONGA, CA ACCESSWIRE March 3, 2022 Amphastar Pharmaceuticals, Inc. NASDAQ:AMPH announced that the Company will release results for its fourth quarter of 2021 ended December 31, 2021, after the market closes on Thursday, March 10th, 2022, and will hold a conference call to discuss its financial results at 2:00 p.m. Pacific Time. 