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