| 1 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 2 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 3 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 4 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 5 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 6 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2025 |
| 7 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 8 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Mar 2025 |
| 9 | Hargis Exploration & Prod., Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1996 |
| 10 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 11 | Harwell Enterprises | Loveland, CO 80537 | Gas Operator | Nov 2019 |
| 12 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 13 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 14 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 15 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Mar 2025 |
| 16 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 17 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 18 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 19 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2025 |
| 20 | Huddleston Oil And Gas Company | Millsap, TX 76066 | Gas Operator | Dec 2002 |
| 21 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 22 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 23 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 24 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Mar 2025 |
| 25 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |