Live feed16:25:04·861dINSIDERFilingvia QuantisnowUssery James Derek covered exercise/tax liability with 8,535 shares and was granted 43,953 shares, increasing direct ownership by 22% to 193,596 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.SLCA· U.S. Silica Holdings Inc.IndustrialsOriginal source