- Apollo Operating Inc
- Arkoma Gas Co
- Armstrong Oil & Gas
- Barton Springs Investment Corp
- Beacon Petroleum Management
- Bivins Energy Corp
- Bridwell Systems Corp
- Bright & Co
- Browning Oil Co
- Bruce K Hightower
- Canfield Oil & Gas Corp
- Carter-Langham Inc
- Castleguard Energy Inc
- Cenesia Petroleum Corp
- Cretaceous Energy Inc
- Daesung Energy Resources Inc
- Dallas Exploration Inc
- Dallas Production Inc
- Dallas Sunbelt Oil & Gas Inc
- EDC
- ERGCO Corp
- Estate Oil & Gas Corp
- FGB Energy Inc
- Five States Energy Co LLC
- Flare Resources Inc
- Frank B Haughton
- Frontier Exploration Co
- Gentry Petroleum Corp
- Glacier Exploration
- HCM
- Hydrocarbon Exchange Corp
- Ingram Oil & Gas
- Jane Christian
- Jeff Kremer
- Keystone Oil Co
- Landmark Graphics Corp
- Loudon Exploration
- Lundberg Oil Co
- Lyco Energy Corp
- Magna Resources
- Martineau Petroleum
- Mc Gowen Resources Co
- Mildren Energy Svc Inc
- Nadel & Gussman LLC
- Nolan Group
- Oklahoma Oil Co
- Palaura Exploration Co
- Petroleum Resources Of Texas
- Petrosearch Energy Corp
- Purnell Morrow Co
- Raptor Exploration Co Inc
- Reeder Energy
- Rich Thomas
- Robert H Hyde
- Roy Guffey Oil Co
- Smnw Resources LLC
- Spence Energy Co
- Stroube Energy Corp
- Trophy Harvest Energy Co
- TSC Oil & Gas
- Walter Exploration Co