- Atchley Resources Inc
- Bale Corp
- Barbour Energy Corp
- Clyde E Davis
- Comanche Resources Co
- H Huffman & Co
- Heartland Exploration Inc
- Kirkpatrick Oil Co
- Martin Oil Properties
- Ok Oil & Gas Management Inc
- Payne Exploration Co
- Republic Resources Corp
- Richard Exploration Co
- Rio Blanco Operating
- Shelburne Oil Co
- Summit Oil Co
- Walbert Co
