Anadarko Petroleum Corporation (APC)
Approach Resources, Inc. (AREX)
Apache Corp. (APA)
Baker Hughes Incorporated (BHI)
Brigham Exploration Co. (BEXP)
BP plc (BP)
Cabot Oil & Gas Corporation (COG)
Carrizo Oil & Gas Inc. (CRZO)
Chevron Corporation (CVX)
Cimarex Energy Co. (XEC)
Continental Resources Inc. (CLR)
Concho Resources, Inc. (CXO)
ConocoPhillips (COP)
Chesapeake Energy Corporation (CHK)
Crimson Exploration Inc. (CXPO)
Denbury Resources Inc. (DNR)
Devon Energy Corporation (DVN)
EOG Resources, Inc. (EOG)
EXCO Resources Inc. (XCO)
Forest Oil Corp. (FST)
Geomet, Inc. (GMET)
GeoResources, Inc. (GEOI)
GMX Resources Inc. (GMXR)
Halliburton Company (HAL)
Hess Corporation (HES)
Linn Energy, LLC (LINE)
Magnum Hunter Resources Corp. (MHR)
Marathon Oil Corporation (MRO)
MDU Resources Group Inc. (MDU)
Newfield Exploration Co. (NFX)
Nexen Inc. (NXY)
National Oilwell Varco, Inc. (NOV)
Northern Oil and Gas, Inc. (NOG)
Newfield Exploration Co. (NFX)
Oasis Petroleum Inc. (OAS)
Oceaneering International, Inc. (OII)
Occidental Petroleum Corporation (OXY)
Petrohawk Energy Corporation (HK)
Petroleum Development Corporation (PETD)
Penn Virginia Corp. (PVA)
Pioneer Drilling Co. (PDC)
Pioneer Natural Resources Co. (PXD)
Plains Exploration & Production Company (PXP)
Range Resources Corporation (RRC)
Rex Energy Corporation (REXX)
Rosetta Resources, Inc. (ROSE)
SandRidge Energy, Inc. (SD)
Schlumberger Limited (SLB)
Southwestern Energy Co. (SWN)
Stone Energy Corp. (SGY)
Swift Energy Co. (SFY)
Venoco, Inc. (VQ)
Whiting Petroleum Corp. (WLL)
Williams Companies, Inc. (WMB)
Advantage Oil & Gas Ltd. (AAV)
Alon USA Energy, Inc. (ALJ)
Anadarko Petroleum Corporation (APC)
Apache Corp. (APA)
Approach Resources, Inc. (AREX)
Atlas Energy, Inc. (ATLS)
Atlas Energy Resources LLC (ATN)
Atlas Pipeline Partners LP (APL)
Atwood Oceanics, Inc. (ATW)
Baker Hughes Incorporated (BHI)
Bill Barrett Corp. (BBG)
BMB Munai Inc. (KAZ)
BP plc (BP)
BPZ Resources, Inc. (BPZ)
Breitburn Energy Partners LP (BBEP)
Brigham Exploration Co. (BEXP)
Bronco Drilling Co. Inc. (BRNC)
Cabot Oil & Gas Corporation (COG)
CAMAC Energy Inc. (CAK)
Cameron International Corporation (CAM)
Cano Petroleum, Inc. (CFW)
Carrizo Oil & Gas Inc. (CRZO)
Cenovus Energy Inc. (CVE)
CNOOC Ltd. (CEO)
Cheniere Energy, Inc. (LNG)
Chevron Corporation (CVX)
China North East Petroleum Holdings Limited (NEP)
China Integrated Energy, Inc. (CBEH)
Cimarex Energy Co. (XEC)
Core Laboratories NV (CLB)
Continental Resources Inc. (CLR)
Cobalt International Energy, Inc. (CIE)
Comstock Resources Inc. (CRK)
Concho Resources, Inc. (CXO)
ConocoPhillips (COP)
Constellation Energy Partners LLC (CEP)
Cheniere Energy Partners LP. (CQP)
Chesapeake Energy Corporation (CHK)
Crimson Exploration Inc. (CXPO)
Crosstex Energy Inc. (XTXI)
Dawson Geophysical Co. (DWSN)
Dejour Enterprises, Ltd. (DEJ)
Denbury Resources Inc. (DNR)
Devon Energy Corporation (DVN)
Dril-Quip, Inc. (DRQ)
Diamond Offshore Drilling Inc. (DO)
Eagle Rock Energy Partners, L.P. (EROC)
Equal Energy Ltd. (EQU)
Enbridge Inc. (ENB)
Energy XXI Limited (EXXI)
EOG Resources, Inc. (EOG)
El Paso Corp. (EP)
EXCO Resources Inc. (XCO)
Flotek Industries Inc. (FTK)
Forest Oil Corp. (FST)
Frontier Oil Corp. (FTO)
FX Energy Inc. (FXEN)
Gastar Exploration, Ltd. (GST)
GeoGlobal Resources Inc. (GGR)
Geomet, Inc. (GMET)
GeoResources, Inc. (GEOI)
Goodrich Petroleum Corp. (GDP)
GMX Resources Inc. (GMXR)
Gran Tierra Energy Inc. (GTE)
Gasco Energy Inc. (GSX)
Halliburton Company (HAL)
Helmerich & Payne Inc. (HP)
Helix Energy Solutions Group, Inc. (HLX)
Hercules Offshore, Inc. (HERO)
Hess Corporation (HES)
Hyperdynamics Corporation (HDY)
Imperial Oil Ltd. (IMO)
InterOil Corporation (IOC)
Kinder Morgan Management LLC (KMR)
Legacy Reserves Lp (LGCY)
Linn Energy, LLC (LINE)
Magellan Petroleum Corporation (MPET)
Magnum Hunter Resources Corp. (MHR)
MarkWest Energy Partners LP (MWE)
Marathon Oil Corporation (MRO)
McMoRan Exploration Co. (MMR)
MDU Resources Group Inc. (MDU)
Miller Petroleum Inc. (MILL)
Murphy Oil Corporation (MUR)
Nabors Industries Ltd. (NBR)
Newfield Exploration Co. (NFX)
Newpark Resources Inc. (NR)
Nexen Inc. (NXY)
National Oilwell Varco, Inc. (NOV)
NGAS Resources Inc. (NGAS)
Noble Corp. (NE)
Noble Energy, Inc. (NBL)
Northern Oil and Gas, Inc. (NOG)
Newfield Exploration Co. (NFX)
Newpark Resources Inc. (NR)
Oasis Petroleum Inc. (OAS)
Oceaneering International, Inc. (OII)
Occidental Petroleum Corporation (OXY)
Parker Drilling Co. (PKD)
Patterson-UTI Energy Inc. (PTEN)
Petrohawk Energy Corporation (HK)
Petroleo Brasileiro (PBR)
Petroleum Development Corporation (PETD)
Penn Virginia Corp. (PVA)
Pioneer Drilling Co. (PDC)
Pioneer Natural Resources Co. (PXD)
Plains Exploration & Production Company (PXP)
Precision Drilling Corporation (PDS)
Pride International Inc. (PDE)
QEP Resources, Inc. (QEP)
Questar Corporation (STR)
Oil States International Inc. (OIS)
RAM Energy Resources, Inc. (RAME)
Range Resources Corporation (RRC)
Rex Energy Corporation (REXX)
Rosetta Resources, Inc. (ROSE)
Royale Energy Inc. (ROYL)
SandRidge Energy, Inc. (SD)
Schlumberger Limited (SLB)
SeaDrill Limited (SDRL)
Seahawk Drilling, Inc. (HAWK)
Sinopec Shanghai Petrochemical Co. Ltd. (SHI)
SM Energy Company (SM)
Sonde Resources Corp. (SOQ)
Southwestern Energy Co. (SWN)
Spectra Energy Corp. (SE)
Statoil ASA (STO)
Stone Energy Corp. (SGY)
Sulphco Inc. (SUF)
Superior Energy Services Inc. (SPN)
Swift Energy Co. (SFY)
Tengasco Inc. (TGC)
Tesco Corporation (TESO)
Tesoro Corporation (TSO)
Talisman Energy Inc. (TLM)
Toreador Resources Corp. (TRGL)
Tri-Valley Corp. (TIV)
TransAtlantic Petroleum Ltd. (TAT)
TransGlobe Energy Corp. (TGA)
Transocean Ltd. (RIG)
Union Drilling, Inc. (UDRL)
Unit Corp. (UNT)
Ultra Petroleum Corp. (UPL)
US Energy Corp. (USEG)
Valero Energy Corp. (VLO)
Vantage Drilling Company (VTG)
Venoco, Inc. (VQ)
Voyager Oil & Gas, Inc. (VYOG.OB)
Warren Resources Inc. (WRES)
Weatherford International Ltd. (WFT)
Western Refining Inc. (WNR)
Whiting Petroleum Corp. (WLL)
Williams Companies, Inc. (WMB)
W&T Offshore Inc. (WTI)
9 years ago
