COMPANIES IN THIS INDUSTRY

ARPJQ – ATLAS RESOURCE PARTNERS, L.P.
ATW – ATWOOD OCEANICS INC
BRNC – BRONCO DRILLING COMPANY, INC.
CBNR – CUBIC ENERGY INC
CDG – CLIFFS DRILLING CO
CEI – Camber Energy, Inc.
DO – Diamond Offshore Drilling, Inc.
EGAS1 – ENERGY SEARCH INC
ERN – Erin Energy Corp.
ESV – ENSCO plc
FLC1 – R&B FALCON CORP
GGLR – GEOGLOBAL RESOURCES INC.
GLM – GLOBAL MARINE INC
GSF – GLOBALSANTAFE CORP
GW – GREY WOLF INC
HAWK1 – SEAHAWK DRILLING, INC.
HEROQ – HERCULES OFFSHORE, INC.
HP – Helmerich & Payne, Inc.
ICD – Independence Contract Drilling, Inc.
MRL – MARINE DRILLING COMPANIES INC
NADL – NORTH ATLANTIC DRILLING LTD. (Foreign)
NBR – Nabors Industries Ltd.
NE – Noble Corporation
NORC – NORTON DRILLING SERVICES INC
ORIG – Ocean Rig UDW Inc.
PACDQ – PACIFIC DRILLING S.A. (Foreign)
PDE – PRIDE INTERNATIONAL INC
PES – Pioneer Energy Services Corp.
PGNPQ – PARAGON OFFSHORE PLC
PTEN – Patterson-UTI Energy, Inc.
RDC – Rowan Companies plc
RIG – Transocean Ltd.
RIGP – TRANSOCEAN PARTNERS LLC
SDLP – Seadrill Partners LLC
SDRL – Seadrill Limited
SDRL1 – SEADRILL LTD (Foreign)
SMVB – SMEDVIG ASA (Foreign)
SSNYY – SAMSON OIL & GAS LTD
TECJQ – TETON ENERGY CORP
THE – TODCO
UDRL – UNION DRILLING INC
UNT – Unit Corporation
VNGE – VANGUARD ENERGY CORP
VOIL – VIRTUS OIL & GAS CORP.
VTG – VANTAGE DRILLING CO