| 1 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Dec 2025 |
| 2 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 3 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 4 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 5 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | Dec 2025 |
| 6 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 7 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 8 | Hansford, Inc. | Amarillo, TX 79101 | Gas Operator | Dec 2004 |
| 9 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 10 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 11 | Hawk Well Service | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 12 | Helo Energy, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2001 |
| 13 | Helton, Pat A. & Alberta | Allison, TX 79003 | Oil & Gas Operator | Dec 2025 |
| 14 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 15 | Herrmann, J.B. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2019 |
| 16 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 17 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Dec 2025 |
| 18 | Holco Oil & Gas | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 19 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2025 |
| 20 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 21 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 22 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2025 |
| 23 | Hufo Production Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2002 |
| 24 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 25 | Hydroc Oil Company | Borger, TX 79007 | Oil & Gas Operator | May 2012 |