| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hickox, I. N. | Oil Operator | Nov 1967 | |
| 2 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 3 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |