| 1 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 2 | H3 Operating, LLC | Springtown, TX 76082 | Oil & Gas Operator | May 2020 |
| 3 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 4 | Halek Energy L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jan 2014 |
| 5 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2026 |
| 6 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2026 |
| 7 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 8 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 9 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 10 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 11 | Harwell Enterprises Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jan 2005 |
| 12 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 13 | Hawkins, G. A. | Graham, TX 76450 | Oil & Gas Operator | Dec 2013 |
| 14 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 15 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 16 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 17 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 18 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 19 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 20 | Herzfeld Fabricators Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 21 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2026 |
| 22 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2026 |
| 23 | Hibernia Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2014 |
| 24 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 25 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 26 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2026 |
| 27 | Hindman, E. C. Jr. Partnership | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2008 |
| 28 | Hitex Resources, LP | Houston, TX 77265 | Oil & Gas Operator | Apr 2026 |
| 29 | HMT Genesis Petroleum Corp. | Fort Worth, TX 76116 | Oil & Gas Operator | Nov 2008 |
| 30 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 31 | Hodges & Hodges Productions | Anson, TX 79501 | Oil & Gas Operator | Aug 2003 |
| 32 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Apr 2026 |
| 33 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil & Gas Operator | Apr 2026 |
| 34 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2026 |
| 35 | Howle Operating Account, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1999 |
| 36 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2026 |
| 37 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 38 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 39 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2026 |
| 40 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Apr 2026 |