Live feed16:11:55·860dINSIDERFilingvia QuantisnowUssery James Derek was granted 52,160 shares and covered exercise/tax liability with 24,551 shares, increasing direct ownership by 14% to 221,205 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.SLCA· U.S. Silica Holdings Inc.IndustrialsOriginal source