Live feed16:09:59·812dINSIDERFilingvia QuantisnowUssery James Derek sold $650,062 worth of shares (46,433 units at $14.00), decreasing direct ownership by 21% to 174,772 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.SLCA· U.S. Silica Holdings Inc.IndustrialsOriginal source