Live feed17:02:44·1221dINSIDERFilingvia QuantisnowSEC Form 4: Shinn Bryan Adair covered exercise/tax liability with 43,870 shares, decreasing direct ownership by 3% to 1,519,183 units (tax withholding)ByQuantisnow·Wall Street's wire, on your screen.SLCA· U.S. Silica Holdings Inc.IndustrialsOriginal source