Live feed18:16:22·37dINSIDERFilingvia QuantisnowSENIOR EVP, PRODUCTION CENTER Zhou Rong covered exercise/tax liability with 1,225 shares, decreasing direct ownership by 0.71% to 171,554 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.AMPH· Amphastar Pharmaceuticals Inc.Health CareOriginal source