Live feed16:22:15·422dINSIDERFilingvia QuantisnowSENIOR EVP, PRODUCTION CENTER Zhou Rong covered exercise/tax liability with 1,121 shares, decreasing direct ownership by 0.95% to 117,348 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.AMPH· Amphastar Pharmaceuticals Inc.Health CareOriginal source