| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H. & N. Operating Co., Inc. | Oil & Gas Operator | Oct 1997 | |
| 2 | Hayes & Assoc Inc | Oil & Gas Operator | Oct 1991 | |
| 3 | Herlihy, John D. | Oil & Gas Operator | May 1997 | |
| 4 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2024 |
| 5 | Hollingsworth & Assoc | Oil Operator | Feb 1987 |