| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | S G L B Operating Company Inc | Oil & Gas Operator | Nov 1993 | |
| 2 | Santa Fe Energy Operg Parts LP | Oil & Gas Operator | Nov 1993 | |
| 3 | Senior G&A Operating Co Inc | Oil & Gas Operator | Nov 1991 | |
| 4 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 5 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 6 | Southwest General Dev., Inc. | Oil & Gas Operator | Dec 2003 | |
| 7 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |