PBR petroleo brasileiro s.a.- petrobras NYSE Oil & Gas Production PBT permian basin royalty trust NYSE Oil & Gas Production PBA pembina pipeline corp. ordinary shares (canada) NYSE Oil & Gas Production PED pedevco corp. AMEX Oil & Gas Production BTU peabody energy corporation NYSE Coal Mining PBF pbf energy inc. class a NYSE Integrated oil Companies PTEN patterson-uti energy, inc. NASDAQ Oil & Gas Production PARR par pacific holdings, inc. AMEX Oil & Gas Production OIS oil states international, inc. NYSE Metal Fabrications OII oceaneering international, inc. NYSE Oilfield Services/Equipment OXY occidental petroleum corporation NYSE Oil & Gas Production OBE obsidian energy ltd. NYSE Oil & Gas Production NS nustar energy l.p. common units NYSE Natural Gas Distribution NOV nov inc. NYSE Metal Fabrications NOG northern oil and gas, inc. AMEX Oil & Gas Production NRT north european oil royality trust NYSE Oil & Gas Production NOA north american construction group ltd. common shares (no par) NYSE Oilfield Services/Equipment NE noble corporation plc a ordinary shares NYSE Oil & Gas Production NGL ngl energy partners lp common units representing limited partner interests NYSE Oil Refining/Marketing NR newpark resources, inc. NYSE Metal Fabrications GBR new concept energy, inc AMEX Oil & Gas Production NCSM ncs multistage holdings, inc. NASDAQ Oilfield Services/Equipment NRP natural resource partners lp limited partnership NYSE Coal Mining NGS natural gas services group, inc. NYSE Oilfield Services/Equipment NBR nabors industries ltd. NYSE Oil & Gas Production MVO mv oil trust units of beneficial interests NYSE Oil & Gas Production MUR murphy oil corporation NYSE Oil & Gas Production MPLX mplx lp common units representing limited partner interests NYSE Natural Gas Distribution MGEE mge energy inc. NASDAQ Electric Utilities: Central MXC mexco energy corporation AMEX Oil & Gas Production MTR mesa royalty trust NYSE Oil & Gas Production MTDR matador resources company NYSE Oil & Gas Production MMLP martin midstream partners l.p. - common units representing limited partnership interests NASDAQ Oil Refining/Marketing MARPS marine petroleum trust - units of beneficial interest NASDAQ Oil & Gas Production MPC marathon petroleum corporation NYSE Integrated oil Companies MRO marathon oil corporation NYSE Oil & Gas Production TUSK mammoth energy services, inc. NASDAQ Oilfield Services/Equipment LGCY legacy education inc. NASDAQ Oil & Gas Production KOS kosmos energy ltd. common shares (de) NYSE Oil & Gas Production PHG koninklijke philips n.v. ny registry shares NYSE Consumer Electronics/Appliances KRP kimbell royalty partners common units representing limited partner interests NYSE Oil & Gas Production ISRL israel acquisitions corp NASDAQ Oil & Gas Production ICD independence contract drilling, inc. NYSE Oil & Gas Production IMO imperial oil limited AMEX Integrated oil Companies IPWR ideal power inc. NASDAQ Industrial Machinery/Components HUSA houston american energy corporation AMEX Oil & Gas Production HOLI hollysys automation technologies, ltd. NASDAQ Industrial Machinery/Components HESM hess midstream lp class a representing limited partner interests NYSE Oil & Gas Production HES hess corporation NYSE Integrated oil Companies HP helmerich & payne, inc. NYSE Oil & Gas Production