| 1 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 2 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 3 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2024 |
| 4 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Dec 2024 |
| 5 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 6 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Dec 2024 |
| 7 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 8 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 9 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 10 | Harris Energy Partners Op, LLC | Fort Worth, TX 76116 | Oil Operator | Dec 2024 |
| 11 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Dec 2024 |
| 12 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 13 | Henry, John Petroleum | Dallas, TX 75225 | Oil & Gas Operator | Dec 2001 |
| 14 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 15 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2024 |
| 16 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2024 |
| 17 | HGN Operating Co Inc | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 18 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Dec 2024 |
| 19 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 20 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 21 | Hipp Oil And Gas Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Dec 2024 |
| 22 | Hodges & Hodges Productions | Anson, TX 79501 | Oil & Gas Operator | Aug 2003 |
| 23 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2024 |
| 24 | Holden Oil & Gas | Abilene, TX 79608 | Oil & Gas Operator | Dec 2023 |
| 25 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 26 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 27 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 28 | Humphrey-Bashford Oil, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2010 |
| 29 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 30 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |