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