COMPANIES IN THIS INDUSTRY

ALY – ALLIS CHALMERS ENERGY INC.
APY – APERGY CORP
AROC – Archrock, Inc.
AUSPF – AUSTRAL PACIFIC ENERGY LTD (Foreign)
BAS – Basic Energy Services, Inc.
BHGE – Baker Hughes, a GE company
BHI – BAKER HUGHES INC
BJS – BJ SERVICES CO
BOLT – TELEDYNE BOLT INC
BRS – Bristow Group Inc
CAM – CAMERON INTERNATIONAL CORP
CCLP – CSI Compressco LP
CELP – Cypress Energy Partners, L.P.
CGG – CGG
CJ – C&J Energy Services, Inc
CJES1 – C&J ENERGY SERVICES, INC.
CJESQ – C&J ENERGY SERVICES, INC.
CKH – SEACOR Holdings, Inc.
CLB – Core Laboratories N.V.
COD – CHILES OFFSHORE INC
CPX – COMPLETE PRODUCTION SERVICES, INC.
CRR – Carbo Ceramics, Inc.
DEEPQ – SUPERIOR OFFSHORE INTERNATIONAL INC.
DENR – DISCOVERY ENERGY CORP.
DNOW – NOW Inc.
DRQ – Dril-Quip, Inc.
DUNR – DUNE ENERGY INC
DVR – CAL DIVE INTERNATIONAL, INC.
DWSN – Dawson Geophysical Company
DWSN1 – DAWSON GEOPHYSICAL CO
EGEO – EAGLE GEOPHYSICAL INC
EMES – Emerge Energy Services LP
ENSV – ENSERVCO Corporation
ERCI – ERC INDUSTRIES INC
ESES – Eco-Stim Energy Solutions, Inc.
EXTN – Exterran Corporation
EXXIQ – ENERGY XXI LTD
FESLQ – FORBES ENERGY SERVICES LTD.
FET – Forum Energy Technologies, Inc.
FI – Frank's International N.V.
FMSA – Fairmount Santrol Holdings Inc.
FRAC – Keane Group, Inc.
FTI – TechnipFMC plc
FTI1 – FMC TECHNOLOGIES INC
FTK – Flotek Industries, Inc.
FTSI – FTS International, Inc.
GEGSQ – GLOBAL GEOPHYSICAL SERVICES INC
GEOR – GEOPETRO RESOURCES CO
GEOS – Geospace Technologies Corporation
GIFI – Gulf Island Fabrication, Inc.
GLBL1 – GLOBAL INDUSTRIES LTD
GLF – GulfMark Offshore, Inc.
GLFMQ – GULFMARK OFFSHORE INC
GRP1 – GRANT PRIDECO INC
HAL – Halliburton Company
HLX – Helix Energy Solutions Group, Inc.
HOFF – HORIZON OFFSHORE INC
HOS – Hornbeck Offshore Services
HSOG – HOME STAKE OIL & GAS CO
HYDL – HYDRIL CO
IIR – IRI INTERNATIONAL CORP
IO – Ion Geophysical Corporation
KEG – Key Energy Services, Inc.
KOG – KODIAK OIL & GAS CORP
LBRT – Liberty Oilfield Services Inc.
MARPS – Marine Petroleum Trust
MDR – McDermott International, Inc.
MRC – MRC Global Inc.
MTRX – Matrix Service Company
NCSM – NCS Multistage Holdings, Inc.
NESCQ – NUVERRA ENVIRONMENTAL SOLUTIONS, INC.
NGS – Natural Gas Services Group, Inc.
NINE – Nine Energy Service, Inc.
NOA – North American Energy Partners, Inc.
NOV – National Oilwell Varco, Inc.
NR – Newpark Resources, Inc.
OII – Oceaneering International, Inc.
OIS – Oil States International, Inc.
OMNI – OMNI ENERGY SERVICES CORP
PDR – PENDARIES PETROLEUM LTD
PDRT – PARTICLE DRILLING TECHNOLOGIES INC
PDS – Precision Drilling Corporation
PESC – POOL ENERGY SERVICES CO
PFIE – Profire Energy, Inc.
PKD – Parker Drilling Company
PRB1 – BLACK RAVEN ENERGY, INC.
PRS – PURE RESOURCES INC
PUMP – ProPetro Holding Corp.
PVX – PROVIDENT ENERGY LTD (Foreign)
QES – Quintana Energy Services Inc.
QSEP – QS ENERGY, INC.
RCON – Recon Technology, Ltd.
RES – RPC, Inc.
RNGR – Ranger Energy Services, Inc.
SAEX – SAExploration Holdings, Inc.
SARAQ – SARATOGA RESOURCES INC
SCSWF – SUBSEA 7 S.A. (Foreign)
SDPI – Superior Drilling Products, Inc.
SELA – SEITEL INC
SHDN – SHERIDAN ENERGY INC
SII – SMITH INTERNATIONAL INC
SLB – Schlumberger N.V.
SLPHQ – SULPHCO INC
SOI – Solaris Oilfield Infrastructure, Inc.
SPN – Superior Energy Services, Inc.
SSE – SEVENTY SEVEN ENERGY INC.
SVSSF – SEVEN SEAS PETROLEUM INC
SWSI – SUPERIOR WELL SERVICES, INC
SXCL – STEEL EXCEL INC.
TCMS – TRANSCOASTAL MARINE SERVICES INC
TDW – Tidewater Inc.
TEGY – TRANSACT ENERGY CORP
TESO – TESCO CORP
THX – HOUSTON EXPLORATION CO
TORC1 – TORCH OFFSHORE INC
TTES – T-3 ENERGY SERVICES INC
TTI – Tetra Technologies, Inc.
TXJK – TEXAS JACK OIL & GAS CORP
USAC – USA Compression Partners, LP
UTI1 – UTI ENERGY CORP
VRC – VARCO INTERNATIONAL INC
VTS – VERITAS DGC INC
WARR – WARRIOR ENERGY SERVICES CORP
WEL – BOOTS & COOTS, INC.
WFT – Weatherford International plc
WG – Willbros Group, Inc.
WH1 – WSP HOLDINGS LTD (Foreign)
WHD – Cactus, Inc.
WHIT – WHITTIER ENERGY CORP
WHQ – W-H ENERGY SERVICES INC