- Arcadia Exploration & Prod
- Bat Energy Co
- Bxp Co LLC
- Cinco Natural Resources Inc
- EBS Oil & Gas Partners LLC
- Geo Co
- Inco Oil Corp
- KKB Interest
- Maguey Management
- Midroc Operating Co
- Northwest Oil Co
- Pan-American Eng Co
- Penn Resources Inc
- Presidio Exploration Inc
- Rising Star Energy LLC
- Rosetta Energy Partners LP
- Star Of Texas Energy Svc Inc
- Sugarberry Oil & Gas Corp
- Three Sisters Partnership
- Titan Energy
- Ventex Oil & Gas
- Wiggins Brothers Inc