| 1 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 2 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 3 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Sep 2026 |
| 4 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 5 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2026 |
| 6 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 7 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 8 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 9 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 10 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Sep 2026 |
| 11 | Herv Oil, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 12 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 13 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 14 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 15 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 16 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 17 | Highmark Energy Operating, LLC | Houston, TX 77253 | Oil & Gas Operator | Sep 2026 |
| 18 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Sep 2026 |
| 19 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 20 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 21 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 22 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 23 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Sep 2026 |
| 24 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 25 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 26 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2026 |
| 27 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |