| 1 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 2 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 3 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 4 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 5 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 6 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Oct 2025 |
| 7 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 8 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 9 | Hayes Oil & Gas Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2005 |
| 10 | HD Special-Situations, LP | San Francisco, CA 94111 | Oil & Gas Operator | Feb 2014 |
| 11 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 12 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Oct 2025 |
| 13 | Heritage Petroleum Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Oct 2025 |
| 14 | Herod, Bill | Ranger, TX 76470 | Oil & Gas Operator | Apr 2022 |
| 15 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 16 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 17 | Hewitt, Alan P. | Midland, TX 79702 | Oil & Gas Operator | Aug 1997 |
| 18 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 19 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 20 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Oct 2025 |
| 21 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |
| 22 | Hill-Lake Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Oct 2025 |
| 23 | Hipp Oil And Gas Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Oct 2025 |
| 24 | Hodges & Rister | Abilene, TX 79603 | Oil & Gas Operator | Apr 2016 |
| 25 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 26 | Hoffmann Oil Company | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 27 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 28 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Oct 2025 |
| 29 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 30 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 31 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 32 | Hudson Brothers Mining Co., Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 1994 |
| 33 | Hudson, Comer Oil & Gas | Cisco, TX 76437 | Oil & Gas Operator | Jan 2003 |
| 34 | Hunter Brothers | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2007 |
| 35 | Hunter Oil & Gas Co. | Bangs, TX 76823 | Oil & Gas Operator | Oct 2025 |