| 1 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 2 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Feb 2026 |
| 3 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 4 | Harris, Sam E. | Albany, TX 76430 | Oil & Gas Operator | Aug 2003 |
| 5 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 6 | Hatcher, Ray | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2002 |
| 7 | Hawk-Hill Operating Company, LLC | Plano, TX 75093 | Oil & Gas Operator | Jun 2009 |
| 8 | Hawkins Oil & Gas Company | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |
| 9 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Feb 2026 |
| 10 | Herencia Operating LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 11 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 12 | Hilltex Operating Company, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 13 | Hindman, E. C. Jr. Partnership | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2008 |
| 14 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 15 | Hoffmann Oil Company | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 16 | Hogan, Wayne Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jun 2006 |
| 17 | Holcomb Enterprises | Clyde, TX 79510 | Oil & Gas Operator | Aug 2003 |
| 18 | Holden Oil & Gas | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 19 | Holson Well Service | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 20 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 21 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 22 | Hughes & Patterson Oper. Corp. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 23 | Humber Oil Company | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 24 | Humphrey, Thos.D. Oil Prop.,Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Aug 1999 |
| 25 | Humphrey-Bashford Oil, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2010 |
| 26 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 27 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 28 | Huson Corp. | Albany, TX 76430 | Oil & Gas Operator | May 2003 |