| 1 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 2 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 3 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 4 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 5 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 6 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Dec 2024 |
| 7 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Aug 2024 |
| 8 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 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 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 12 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 13 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Dec 2024 |
| 14 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 15 | Hoc Operating Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Nov 1999 |
| 16 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | Dec 2024 |
| 17 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 18 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 19 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 20 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 21 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 22 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 23 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 24 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
| 25 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |