Companies covered: Natural Gas Services Group, Inc. (NYSE:NGS), Exxon Mobil Corporation (NYSE:XOM), Chevron Corporation (NYSE:CVX), Valero Energy Corporation (NYSE:VLO), PBF Energy Inc. (NYSE:PBF), HollyFrontier Corporation (NYSE:HFC), Anadarko Petroleum Corporation (NYSE:APC), Devon Energy Corporation (NYSE:DVN), SM Energy Company (NYSE:SM), PDC Energy, Inc. (NASDAQ:PDCE), Cenovus Energy Inc (NYSE:CVE), Trecora Resources (NYSE:TREC), Marathon Oil Corporation (NYSE:MRO), ConocoPhillips (NYSE:COP), Occidental Petroleum Corporation (NYSE:OXY), BP p.l.c. (NYSE:BP), YPF Sociedad Anonima (NYSE:YPF), Petroleo Brasileiro S.A.- Petrobras (NYSE:PBR), Hess Corporation (NYSE:HES), Murphy Oil Corporation (NYSE:MUR), Halliburton Company (NYSE:HAL), Baker Hughes (NYSE:BKR), General Electric Company (NYSE:GE), Schlumberger N.V. (NYSE:SLB), FMC Technologies, Inc. (NYSE:FTI), AKER SOLUTIONS ASA NK1,08 (FRA:1AKA), National Oilwell Varco, Inc. (NYSE:NOV), SEVENTY SEVEN ENER COM USD0.01 (OTCMKTS:SVNT), Patterson-UTI Energy, Inc. (NASDAQ:PTEN), Key Energy Services, Inc. (NYSE:KEG), Basic Energy Services, Inc. (NYSE:BAS), Weatherford International plc (NYSE:WFT), Superior Energy Services, Inc. (NYSE:SPN), Mammoth Energy Services Inc (NASDAQ:TUSK), U.S. Silica Holdings, Inc. (NYSE:SLCA), Fairmount Santrol Holdings Inc (NYSE:FMSA), Hi-Crush Partners LP (NYSE:HCLP), Smart Sand Inc (NASDAQ:SND), Targa Resources Corp. (NYSE:TRGP), Summit Midstream Partners, LP (NYSE:SMLP), Antero Resources Corporation (NYSE:AR), Tesla Motors, Inc. (NASDAQ:TSLA), Williams Companies, Inc. (The) (NYSE:WMB), TransCanada Corporation (NYSE:TRP), Sunoco Logistics Partners LP (NYSE:SXL), Plains All American Pipeline, L.P. (NYSE:PAA), ENERGY TRANSFER PARTNERS (NYSE:ETP), Antero Midstream Partners LP (NYSE:AM), RPC, Inc. (NYSE:RES), Transocean Ltd. (NYSE:RIG), Diamond Offshore Drilling, Inc. (OTCMKTS:DOFSQ), ENSCO plc (NYSE:ESV), Noble Energy Inc. (NYSE:NBL), Precision Drilling Corporation (NYSE:PDS)
