Abraxas Petr. AXAS (RM) Helix Energy HLX (MWM) Sanchez Engy SN (RM) Anadarko APC (CM) Helmerich/Payne HP (DB) Sanchez Mid. SNMP (GV) Apache APA (CM) Hi-Crush Partners HCLP (MWM) Schlumberger SLB (DB) Archrock, Inc. AROC (DB) HighPoint Res. HPR (BC) Silverbow SBOW (RM) Baker Hughes BHGE (DB) Hornbeck Offsh HOS (DB) Smart Sand SND (MWM) Basic Energy BAS (DB) Independ. Cont. ICD (DB) Solaris Oilfield SOI (MWM) Berry Petrol. BRY (BC) Innospec Inc IOSP (RS) Southwestern SWN (CM) Bristow Grp BRS (DB) Jones Energy JONE (RM) SRC Energy SRCI (BC) Cabot Oil COG (CM) Key Energy Svcs. KEG (DB) Sundance SNDE (BC) Cactus, Inc. WHD (MWM) Kosmos Energy KOS (CM) Superior Engy SPN (DB) Callon Petl. CPE (RM) Lilis Energy Inc. LLEX (RM) TEAM Inc. TISI (MWM) Carrizo Oil CRZO (RM) Lonestar Res. LONE (RM) TechnipFMC plc FTI (MWM) Centennial Rs CDEV (BC) Mammoth Energy TUSK (DB) TETRA TTI (MWM) Chaparral CHAP (RM) Matador Res. MTDR (BC) Thermon Grp THR (MWM) Chart Industr GTLS (MWM) McDermott Intl. MDR (MWM) Tidewater TDW (RS) Chesapeake CHK (CM) Nabors Industries NBR (DB) Transocean RIG (GV) C&J Energy CJ (DB) National Oilwell NOV (MWM) Unit Corp. UNT (BC) CNX Midstr. CNXM (GV) Newfield Expl NFX (RM) US Silica Hld SLCA (MWM) Comstock CRK (RM) Newpark Res. NR (GV) Weatherford WFT (DB) Concho Res. CXO (CM) Noble Energy NBL (CM) Whiting Pet WLL (BC) Contango MCF (RM) Noble Corp. NE (GV) Wildhorse WRD (BC) Continental Rs CLR (BC) Noble Midstream NBLX (GV) WPX Ergy WPX (BC) Covia Holdings CVIA (MWM) Northern Oil NOG (BC) Core Lab. CLB (GV) Oasis Midstr. OMP (GV) Denbury DNR (CM) Oasis Petroleum OAS (RM) Devon DVN (CM) Oceaneering OII (DB) Diamond Off DO (GV) Oil States Int'l OIS (DB) Diamondback FANG (CM) Parker Drilling PKD (DB) Dril-Quip DRQ (MWM) Parsley Energy PE (CM) Earthstone ESTE (RM) Patterson-UTI PTEN (DB) Eclipse Res. ECR (RM) PDC Energy PDCE (BC) Eco-Stim ESES (DB) Penn Virginia PVAC (BC) Energen Corp EGN (CM) Pioneer Energy PES (DB) Ensco plc ESV (GV) Pioneer Natural PXD (CM) EOG Res. EOG (CM) Plains All Amer PAA (GV) EP Energy EPE (BC) Propetro Hld. PUMP (DB) Evolution Pet EPM (BC) QEP Resource QEP (BC) Flotek Industries FTK (GV) Quanta Srvs PWR (MWM) Forum Energy FET (MWM) Range Res. RRC (RM) Gardner Denver GDI (RS) Ranger Energy RNGR (DB) Goodrich Petr. GDP (RM) Resolute Engy REN (RM) Gulf Island GIFI (MWM) Rice Midstream RMP (GV) Gulfport Energy GPOR (RM) Roan Res. ROAN (RM) Halcon Res. HK (RM) Rowan RDC (GV) Halliburton HAL (DB) RPC Inc. RES (DB) .