- Anderson Oil Co
- Anderson Oil Co
- Black Coral LTD
- Black Coral LTD
- Condor Exploration
- Condor Exploration
- Cordillera Energy Partners
- Cordillera Energy Partners
- DNR Oil & Gas Inc
- Energy Capital Mgmt
- Exsell Services
- Grynberg Petroleum
- Julander Energy Co
- L J Oil Inc
- Leede Operating Co
- Nexen Marketing USA Inc
- Oceanic Exploration Co
- Puckett Co
- Tindall Operating Co
- Tls Operating Engr
- Vortex Petroleum
- Wellington Operating Co
- Western Energy Advisors
