Live feed16:01:41·1192dINSIDERFilingvia QuantisnowSEC Form 4: Layton Mark E. covered exercise/tax liability with 36,375 shares, decreasing direct ownership by 8% to 418,985 units to satisfy withholding taxByQuantisnow·Wall Street's wire, on your screen.TUSK· Mammoth Energy Services Inc.EnergyOriginal source