| 1 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2025 |
| 2 | H & L Gas Co. | Sunray, TX 79086 | Gas Operator | Apr 2018 |
| 3 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 4 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 5 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Oct 2025 |
| 6 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 7 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 8 | Herrmann, J.B. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2019 |
| 9 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Oct 2025 |
| 10 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 11 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Oct 2025 |
| 12 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |
| 13 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 14 | Hufo Production Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2002 |
| 15 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 16 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |