Additional Companies – Outside the U.S.
- Baytex Energy Ltd.
- BG Group
- BHP Billiton Ltd.
- Cairn Energy plc
- Canadian 88 Energy Corp.
- Canadian Natural Resources Ltd.
- EnCana Corp.
- Energy Africa
- FX Energy
- Husky Energy Inc.
- Ivanhoe Energy
- Lukoil Oil Co.
- Lundin Petroleum AB
- Mosaic Oil N.L.
- Navigo Energy Inc.
- Nexen Inc.
- New Zealand Oil & Gas Ltd.
- Norsk Hydro ASA
- OMV AG
- Paramount Resources Ltd.
- Penn West Petroleum Ltd.
- PetroKazakhstan
- Premier Oil plc
- Ramco Energy plc
- Repsol YPF
- Rosneft
- Santos Ltd.
- Sherritt International Corp.
- Summit Resources
- Talisman Energy Inc.
- Tap Oil Ltd.
- Tullow Oil plc
- Vanco Energy Co.
- Vermilion Resources Ltd.
- Yukos Oil Co.