- Bonray Inc
- Bracken Operating Co LLC
- Castle Energy Corp
- Charter Oak Production Co
- Covington Oil Co Inc
- CPC Energy Corp
- Curzon Operating Co
- Geotrace Technologies Inc
- Greenhill Development Co
- H Petro R Inc
- Huntington Energy
- Jma Energy Co LLC
- KEPCO Inc
- Meade Energy Corp
- Petroleum Investments
- R C Taylor Co Inc
- Rynick Resources
- Sequoia Natural Resources LLC
- Southern Resources Inc
- Spark's Energy Inc
