[["DCP Midstream Partners LP",29],["DCP Midstream Partners, LP",5],["ConocoPhillips Co.",4],["National Interstate Corp.",4],["Questar Corporation",4],["Duke Energy Corp.",3],["Enbridge Inc.",3],["Kaiser-Francis Oil Co.",3],["Marathon Oil Corp.",3],["Phillips 66",3],["Apache Corp.",2],["Atmos Energy Corporation",2],["Burlington Stores Inc.",2],["Chesapeake Energy Corporation",2],["Chevron Corp.",2],["Dow Chemical Co.",2],["Duke Energy Corporation",2],["Dynegy Inc.",2],["EQT Corp.",2],["Enterprise Products Partners LP",2],["FMC Corp.",2],["Hilcorp Energy Co.",2],["Noble Energy Inc.",2],["OGE Energy Corp.",2],["PG\u0026E Corporation",2],["Public Service Co. of New Mexico",2],["Royal Dutch Shell PLC",2],["Southern California Gas Co.",2],["Southern Star Central Gas Pipeline Inc.",2],["Southwestern Energy Co.",2],["Valero Energy Corp.",2],["Williams Companies Inc",2],["APA Corp.",1],["Abraxas Petroleum Corp.",1],["Altria Group Inc.",1],["Anadarko Petroleum Corp.",1],["Automotive Rentals Inc.",1],["BAE Systems PLC",1],["Ball Corp.",1],["Black Elk Energy LLC",1],["Cabot Oil \u0026 Gas Corp.",1],["Cameron International Corporation",1],["Cash America International, Inc.",1],["Chaparral Energy Inc.",1],["Cimarex Energy Co.",1],["Citation Oil \u0026 Gas Corp.",1],["Clayton Williams Energy, Inc.",1],["Columbus McKinnon Corporation",1],["Cox Operating LLC",1],["DaVita Inc.",1],["Devon Energy Corp.",1],["EOG Resources Inc.",1],["Enbridge Energy Partners LP",1],["Energen Corporation",1],["Ensco PLC",1],["Exterran Corp.",1],["Exxon Mobil Corp.",1],["Foster Wheeler AG.",1],["GameStop Corp.",1],["Goodrich Petroleum Corporation",1],["Hess Corp.",1],["Hunt Oil Co.",1],["INTECSEA Inc.",1],["Intel Corp.",1],["Kinder Morgan Inc.",1],["Knight-Swift Transportation Holdings Inc.",1],["Lincoln Property Company",1],["Marek Brothers Systems Inc.",1],["McCarthy Holdings",1],["Mewbourne Oil Co. Inc.",1],["Mitsubishi Caterpillar Forklift America Inc.",1],["Mphasis Ltd.",1],["National American Insurance Co.",1],["National Oilwell Varco Inc.",1],["Ovintiv Inc.",1],["Penn Virginia",1],["Pioneer Natural Resources Co.",1],["Pride International Inc.",1],["Quanta Services Inc.",1],["Ravago SA",1],["Reliant Energy Retail Holdings LLC",1],["Sabine Oil \u0026 Gas Corp.",1],["Samson Resources Corp.",1],["Schlumberger Ltd.",1],["Southeastern Freight Lines Inc.",1],["Subsea 7 SA",1],["TechnipFMC PLC",1],["Toshiba Corp.",1],["Total SA",1],["Waste Management Inc.",1]]