AE adams resources & energy, inc. AMEX Oil Refining/Marketing BRN barnwell industries, inc. AMEX Oil & Gas Production BSM black stone minerals, l.p. common units representing limited partner interests AMEX Oil & Gas Production CKX ckx lands, inc. AMEX Oil & Gas Production CRC california resources corporation AMEX Oil & Gas Production ENSV enservco corp AMEX Oilfield Services/Equipment EPM evolution petroleum corporation, inc. AMEX Oil & Gas Production GBR new concept energy, inc AMEX Oil & Gas Production GTE gran tierra energy inc. AMEX Oil & Gas Production HUSA houston american energy corporation AMEX Oil & Gas Production IMO imperial oil limited AMEX Integrated oil Companies MXC mexco energy corporation AMEX Oil & Gas Production NOG northern oil and gas, inc. AMEX Oil & Gas Production PARR par pacific holdings, inc. AMEX Oil & Gas Production PED pedevco corp. AMEX Oil & Gas Production REI ring energy, inc. AMEX Oil & Gas Production SDPI superior drilling products, inc. AMEX Metal Fabrications SNMP evolve transition infrastructure lp common units representing class b limited liability company interests AMEX Oil & Gas Production ARLP alliance resource partners, l.p. - common units representing limited partnership interests NASDAQ Coal Mining BLDP ballard power systems, inc. - common shares NASDAQ Industrial Machinery/Components CCLP csi compressco lp - common units NASDAQ Oilfield Services/Equipment CLMT calumet, inc NASDAQ Integrated oil Companies DMLP dorchester minerals, l.p. - common units representing limited partnership interests NASDAQ Oil & Gas Production DWSN dawson geophysical company NASDAQ Oil & Gas Production FANG diamondback energy, inc. NASDAQ Oil & Gas Production GPOR gulfport energy corporation common shares NASDAQ Oil & Gas Production HNRG hallador energy company NASDAQ Coal Mining HOLI hollysys automation technologies, ltd. NASDAQ Industrial Machinery/Components IPWR ideal power inc. NASDAQ Industrial Machinery/Components ISRL israel acquisitions corp NASDAQ Oil & Gas Production LGCY legacy education inc. NASDAQ Oil & Gas Production MARPS marine petroleum trust - units of beneficial interest NASDAQ Oil & Gas Production METC ramaco resources, inc. NASDAQ Coal Mining MGEE mge energy inc. NASDAQ Electric Utilities: Central MMLP martin midstream partners l.p. - common units representing limited partnership interests NASDAQ Oil Refining/Marketing NCSM ncs multistage holdings, inc. NASDAQ Oilfield Services/Equipment PFIE profire energy, inc. NASDAQ Metal Fabrications PLUG plug power, inc. NASDAQ Industrial Machinery/Components PNRG primeenergy resources corporation NASDAQ Oil & Gas Production PTEN patterson-uti energy, inc. NASDAQ Oil & Gas Production PUMP propetro holding corp. NASDAQ Oilfield Services/Equipment RCON recon technology, ltd. - class a ordinary shares NASDAQ Oilfield Services/Equipment TELL tellurian inc. NASDAQ Oil & Gas Production TPIC tpi composites, inc. NASDAQ Industrial Machinery/Components TUSK mammoth energy services, inc. NASDAQ Oilfield Services/Equipment USEG u.s. energy corp. NASDAQ Oil & Gas Production VNOM viper energy, inc. - class a NASDAQ Oil & Gas Production VTNR vertex energy, inc NASDAQ Integrated oil Companies WPRT westport fuel systems inc - common shares NASDAQ Industrial Machinery/Components WWD woodward, inc. NASDAQ Industrial Machinery/Components