Members
| Addax Petroleum Ltd |
| Alpha Petroleum Resources Limited. |
| Anadarko |
| Anglo Tunesian |
| Ārgentil Capital Partners (UK) Limited |
| Ascent Resources plc |
| Atlantic Petroleum |
| AziNor Catalyst |
| BP |
| Bridge Petroleum |
| Cairn Energy |
| Cal-Energy |
| Centrica plc |
| CIECO Exploration & Production (UK) Ltd |
| CNR International (U.K.) Limited |
| ConocoPhillips UK Limited |
| Consultants |
| Dana Petroleum |
| Discover Exploration Ltd |
| DONG E&P |
| Dyas B.V. |
| EBN |
| Energean |
| ENI |
| EnQuest |
| ENVOI Limited |
| Equinor |
| Evercore |
| ExxonMobil |
| Fabian Ltd |
| Fairfield Energy Limited |
| Finder Energy |
| Gulf Keystone Petroleum (UK) Ltd. |
| Hannon Westwood LLP (CONSULTANCY) |
| Harbour Energy |
| Hartshead Resources |
| Holt Energy Advisors |
| IGas |
| Independent Oil and Gas Plc |
| INEOS |
| Inpex Corporation |
| Investec |
| Ithaca |
| JAPEX |
| Jefferies International Limited |
| JGC Corporation (UK) Ltd. |
| JOGMEC |
| Kallas |
| Kistos |
| Kosmos |
| KPMG |
| LAB Energy Advisors |
| Lloyds |
| Lundin |
| Maersk Oil North Sea UK Ltd |
| Marathon Oil |
| Mazarine Energy |
| Mitsubishi Corporation International (Europe) Plc |
| Mitsui & Co Europe plc |
| MOG |
| MOL Group |
| NEO |
| Neptune Energy |
| Nexen/CNOOC |
| NL Scout Meeting Group |
| Nobel Upstream |
| NOEX |
| Occidental |
| OGA |
| OMV (UK) Limited |
| OND |
| Osaka Gas (UK) Ltd. |
| Perenco PLC |
| Petrofac Energy Developments Ltd |
| Petrogas |
| Pioneer Natural Resources UK |
| Prax |
| Providence Resources P.l.c. |
| ReachCSG (Reach Coal Seam Gas Limited) |
| Repsol |
| Repsol/ Sinopec |
| Rockrose |
| RPS Energy |
| Sasol |
| Schlumberger |
| Scotia Waterous (UK) Limited |
| SDX |
| SERICA Energy |
| Shell |
| SLR Consulting Limited (was Challenge Energy Limited) |
| SOJITZ |
| Spirit |
| Standard Chartered Bank |
| Statoil |
| Stellar Energy Advisors Limited |
| Sumitmo Corp Europe Limited |
| Summit Petroleum Limited |
| Suncor Energy |
| Tailwind |
| Third Energy Limited |
| Total E&P UK Ltd |
| TPH |
| Tudor Pickering Holt / PWP |
| Tullow Oil plc |
| United Oil & Gas |
| Vermilion |
| Vitol |
| Warrego |
| Westwood Global energy |
| Wimbledon Energy |
| Wintershall Noordzee B.V. |