| 1 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2026 |
| 2 | Herrmann Energy | Amarillo, TX 79159 | Oil & Gas Operator | May 2015 |
| 3 | Herrmann, J.B. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2019 |
| 4 | Herrmann, S. W. Oil & Gas | Amarillo, TX 79159 | Oil & Gas Operator | Mar 2026 |
| 5 | Hi Plains Hydrocarbons, Inc. | Sunray, TX 79086 | Oil & Gas Operator | Oct 2002 |
| 6 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2026 |
| 7 | High River Resources Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Dec 2025 |
| 8 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Mar 2026 |
| 9 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2026 |
| 10 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Mar 2026 |
| 11 | Huff Minerals, LTD. | Amarillo, TX 79101 | Gas Operator | Mar 2026 |
| 12 | Hufo Production Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2002 |
| 13 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |