PBR petroleo brasileiro s.a. petrobras ads NYSE Oil & Gas Production PBT permian basin royalty trust NYSE Oil & Gas Production PDS precision drilling corporation NYSE Oil & Gas Production PED pedevco corp. AMEX Oil & Gas Production PHX phx minerals inc. NYSE Oil & Gas Production PNRG primeenergy resources corporation NASDAQ Oil & Gas Production PTEN patterson-uti energy, inc. NASDAQ Oil & Gas Production REI ring energy, inc. AMEX Oil & Gas Production RIG transocean ltd (switzerland) NYSE Oil & Gas Production RRC range resources corporation NYSE Oil & Gas Production SBR sabine royalty trust NYSE Oil & Gas Production SD sandridge energy, inc. NYSE Oil & Gas Production SDRL seadrill limited common shares NYSE Oil & Gas Production SJT san juan basin royalty trust NYSE Oil & Gas Production SM sm energy company NYSE Oil & Gas Production SN sharkninja, inc. ordinary shares NYSE Oil & Gas Production SSL sasol ltd. american depositary shares NYSE Oil & Gas Production TPL texas pacific land corporation NYSE Oil & Gas Production TTI tetra technologies, inc. NYSE Oil & Gas Production USEG u.s. energy corp. NASDAQ Oil & Gas Production VET vermilion energy inc. common (canada) NYSE Oil & Gas Production VNOM viper energy partners lp - common unit NASDAQ Oil & Gas Production VOC voc energy trust units of beneficial interest NYSE Oil & Gas Production WRD weride inc. - american depositary shares NYSE Oil & Gas Production WTI w&t offshore, inc. NYSE Oil & Gas Production AE adams resources & energy, inc. AMEX Oil Refining/Marketing CAPL crossamerica partners lp common units representing limited partner interests NYSE Oil Refining/Marketing GEL genesis energy, l.p. common units NYSE Oil Refining/Marketing GLP global partners lp global partners lp common units representing limited partner interests NYSE Oil Refining/Marketing MMLP martin midstream partners l.p. - common units representing limited partnership interests NASDAQ Oil Refining/Marketing NGL ngl energy partners lp common units representing limited partner interests NYSE Oil Refining/Marketing SUN sunoco lp common units representing limited partner interests NYSE Oil Refining/Marketing CLB core laboratories n.v. NYSE Oilfield Services/Equipment ENSV enservco corp AMEX Oilfield Services/Equipment FI fiserv, inc. NYSE Oilfield Services/Equipment HAL halliburton company NYSE Oilfield Services/Equipment HLX helix energy solutions group, inc. NYSE Oilfield Services/Equipment NCSM ncs multistage holdings, inc. NASDAQ Oilfield Services/Equipment NGS natural gas services group, inc. NYSE Oilfield Services/Equipment NOA north american construction group ltd. common shares (no par) NYSE Oilfield Services/Equipment OII oceaneering international, inc. NYSE Oilfield Services/Equipment PUMP propetro holding corp. NASDAQ Oilfield Services/Equipment RCON recon technology, ltd. - class a ordinary shares NASDAQ Oilfield Services/Equipment RES rpc, inc. NYSE Oilfield Services/Equipment SEMG semgroup NYSE Oilfield Services/Equipment SLB slb limited common shares NYSE Oilfield Services/Equipment TUSK mammoth energy services, inc. NASDAQ Oilfield Services/Equipment WTTR select energy services, inc. class a NYSE Oilfield Services/Equipment