Live feed16:16:47·421dINSIDERFilingvia QuantisnowCEO & CHIEF SCIENTIFIC OFFICER Zhang Jack Y. covered exercise/tax liability with 8,179 shares, decreasing direct ownership by 0.23% to 2,502,801 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.AMPH· Amphastar Pharmaceuticals Inc.Health CareOriginal source