| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H. & N. Operating Co., Inc. | Oil & Gas Operator | Oct 1997 | |
| 2 | Hallwell Gas & Oil Co. | Oil & Gas Operator | Sep 1985 | |
| 3 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 4 | Harry L. Neeb | Oil Operator | May 1985 | |
| 5 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Apr 2024 |
| 6 | Hogan Exploration, Inc. | Oil & Gas Operator | Mar 2000 | |
| 7 | Hondo Operating, Inc. | Oil & Gas Operator | Sep 1997 | |
| 8 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 9 | Hughes & New-D. Braswell | Oil & Gas Operator | Jun 1983 | |
| 10 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 11 | Hurley Oil And Gas Company | Oil & Gas Operator | Jan 1997 | |
| 12 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |