| 1 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 2 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 3 | H. D. Investments | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 4 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 5 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 6 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 7 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 8 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 9 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 10 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 11 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Jul 2025 |
| 12 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 13 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 14 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 15 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 16 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 17 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 18 | Haskit, Kendall | Kyle, TX 78640 | Oil & Gas Operator | Jul 2025 |
| 19 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 20 | Hawkins Energy Corporation | Austin, TX 78711 | Oil & Gas Operator | Apr 1997 |
| 21 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 22 | Hawkins, G. A. | Graham, TX 76450 | Oil & Gas Operator | Dec 2013 |
| 23 | Haynes & Shirley Production Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jul 2025 |
| 24 | HD Special-Situations, LP | San Francisco, CA 94111 | Oil & Gas Operator | Feb 2014 |
| 25 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 26 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 27 | Herod, Bill | Ranger, TX 76470 | Oil & Gas Operator | Apr 2022 |
| 28 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 29 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 30 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jul 2025 |
| 31 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Jul 2025 |
| 32 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 33 | Hindman, E. C. Jr. Partnership | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2008 |
| 34 | Holson Well Service | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 35 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 36 | Howell, Ray | Breckenridge, TX 76424 | Oil & Gas Operator | May 1998 |
| 37 | Howle Operating Account, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1999 |
| 38 | Howle, A.G. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2011 |
| 39 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 40 | Humphrey, Thos.D. Oil Prop.,Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Aug 1999 |
| 41 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2025 |