| 1 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 2 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | Apr 2024 |
| 3 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 4 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 5 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 6 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 7 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 8 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Apr 2024 |
| 9 | Hawkwood Energy Operating, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 10 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 11 | Hawthorn Energy Partners, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2024 |
| 12 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 13 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 14 | Henry, John Petroleum | Dallas, TX 75225 | Oil & Gas Operator | Dec 2001 |
| 15 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Apr 2024 |
| 16 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 17 | Holifield Oil Company | Giddings, TX 78942 | Oil & Gas Operator | Mar 2009 |
| 18 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | Apr 2024 |
| 19 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |
| 20 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Apr 2024 |
| 21 | Homeplace Oil And Gas | Caldwell, TX 77836 | Oil & Gas Operator | Feb 2021 |
| 22 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 23 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 24 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 25 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 26 | Hronek, Kenneth | Caldwell, TX 77836 | Oil & Gas Operator | Apr 2024 |
| 27 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 28 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 29 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2024 |
| 30 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 31 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |