AE adams resources & energy, inc. AMEX Oil Refining/Marketing ARLP alliance resource partners, l.p. - common units representing limited partnership interests NASDAQ Coal Mining AR antero resources corporation NYSE Oil & Gas Production APA apa corporation NYSE Oil & Gas Production ARCH arch resources, inc. class a NYSE Coal Mining BLDP ballard power systems, inc. - common shares NASDAQ Industrial Machinery/Components BRN barnwell industries, inc. AMEX Oil & Gas Production BTE baytex energy corp common shares NYSE Oil & Gas Production BSM black stone minerals, l.p. common units representing limited partner interests AMEX Oil & Gas Production BP bp p.l.c. NYSE Integrated oil Companies BPT bp prudhoe bay royalty trust NYSE Integrated oil Companies BC brunswick corporation NYSE Industrial Machinery/Components BWXT bwx technologies, inc. NYSE Industrial Machinery/Components CRC california resources corporation AMEX Oil & Gas Production CPE callon petroleum company NYSE Oil & Gas Production CLMT calumet, inc NASDAQ Integrated oil Companies CEI camber energy, inc. NYSE Oil & Gas Production CNQ canadian natural resources limited NYSE Oil & Gas Production CVE cenovus energy inc NYSE Oil & Gas Production CHK chesapeake energy corporation NYSE Oil & Gas Production CHKR chesapeake granite watr NYSE Oil & Gas Production CVX chevron corporation NYSE Integrated oil Companies CYD china yuchai international limited NYSE Industrial Machinery/Components CKX ckx lands, inc. AMEX Oil & Gas Production CNX cnx resources corporation NYSE Coal Mining CRK comstock resources, inc. NYSE Oil & Gas Production CNXC concentrix corporation NYSE Coal Mining COP conocophillips NYSE Integrated oil Companies CLB core laboratories inc. NYSE Oilfield Services/Equipment CPG crescent point energy corporation ordinary shares (canada) NYSE Oil & Gas Production CRT cross timbers royalty trust NYSE Oil & Gas Production CAPL crossamerica partners lp common units representing limited partner interests NYSE Oil Refining/Marketing CCLP csi compressco lp - common units NASDAQ Oilfield Services/Equipment CMI cummins inc. NYSE Industrial Machinery/Components CVI cvr energy inc. NYSE Integrated oil Companies DWSN dawson geophysical company NASDAQ Oil & Gas Production DKL delek logistics partners, l.p. common units representing limited partner interests NYSE Natural Gas Distribution DK delek us holdings, inc. NYSE Integrated oil Companies DVN devon energy corporation NYSE Oil & Gas Production DO diamond offshore drilling, inc. NYSE Oil & Gas Production FANG diamondback energy, inc. NASDAQ Oil & Gas Production DNOW dnow inc. NYSE Metal Fabrications DMLP dorchester minerals, l.p. - common units representing limited partnership interests NASDAQ Oil & Gas Production DRQ dril-quip, inc. NYSE Metal Fabrications EC ecopetrol s.a. american depositary shares NYSE Oil & Gas Production EMR emerson electric company NYSE Consumer Electronics/Appliances ENB enbridge inc NYSE Natural Gas Distribution ERF enerplus corporation NYSE Oil & Gas Production E eni s.p.a. NYSE Oil & Gas Production ENSV enservco corp AMEX Oilfield Services/Equipment