Financials & Filings Third Quarter 2017 Financial Results Show all 2020 Q3 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended September 30, 2020 Amphastar Third Quarter Earnings Call Form 10-Q Q2 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended June 30, 2020 Amphastar Second Quarter Earnings Call Form 10-Q Q1 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended March 31, 2020 Amphastar First Quarter Earnings Call Form 10-Q 2019 Q4 Amphastar Pharmaceuticals Reports Financial Results for the Three Months and Full Year Ended December 31, 2019 Amphastar Fourth Quarter Earnings Call Form 10-K Q3 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended September 30, 2019 Amphastar Third Quarter Earnings Call Form 10-Q Q2 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended June 30, 2019 Amphastar Second Quarter Earnings Call Form 10-Q Q1 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended March 31, 2019 Amphastar First Quarter Earnings Call Form 10-Q 2018 Q4 Amphastar Pharmaceuticals Reports Financial Results for the Three Months and Full Year Ended December 31, 2018 Amphastar Fourth Quarter Earnings Call Form 10-K Q3 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended September 30, 2018 Amphastar Third Quarter Earnings Call Form 10-Q Q2 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended June 30, 2018 Amphastar Second Quarter Earnings Call Form 10-Q Q1 Amphastar Pharmaceuticals Reports Financial Results for the Three Months Ended March 31, 2018 Amphastar First Quarter Earnings Call Form 10-Q Proxy Statements Filing date View Apr 08,2015 View HTML 0001171843-15-001880.pdf 0001171843-15-001880.xls 0001171843-15-001880.rtf Apr 22,2016 View HTML 0001297184-16-000003.pdf 0001297184-16-000003.xls 0001297184-16-000003.rtf Form 10-K Filing date View Mar 26,2015 View HTML 0001171843-15-001654.pdf 0001171843-15-001654.xls 0001171843-15-001654.rtf EX-101.INS - XBRL INSTANCE DOCUMENT Mar 15,2016 View HTML 0001558370-16-004146.pdf 0001558370-16-004146.xls 0001558370-16-004146.rtf EX-101.INS - EX-101.INS Form 10-Q Filing date View Aug 13,2014 View HTML 0001171843-14-003951.pdf 0001171843-14-003951.xls 0001171843-14-003951.rtf EX-101.INS - XBRL INSTANCE DOCUMENT Nov 13,2014 View HTML 0001171843-14-005537.pdf 0001171843-14-005537.xls 0001171843-14-005537.rtf EX-101.INS - XBRL INSTANCE DOCUMENT