Live feed17:04:36·1214dINSIDERFilingvia QuantisnowSEC Form 4: Ussery James Derek covered exercise/tax liability with 7,522 shares, decreasing direct ownership by 5% to 158,178 units to satisfy tax liabilityByQuantisnow·Wall Street's wire, on your screen.SLCA· U.S. Silica Holdings Inc.IndustrialsOriginal source