| 1 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Jun 2025 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 3 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 4 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 5 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 6 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 7 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 8 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 9 | El Dorado Gas & Oil, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 10 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 11 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 12 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Jun 2025 |
| 13 | Encina Resources, LLC | Houston, TX 77251 | Oil & Gas Operator | Jun 2025 |
| 14 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Jun 2025 |
| 15 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 16 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Jun 2025 |
| 17 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 18 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 19 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 20 | Enmark Gas Gathering L. P. | Dallas, TX 75252 | Oil & Gas Operator | Jan 2025 |
| 21 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 22 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 23 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 24 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 25 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 26 | Escondido Resources GP, LLC | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 27 | Escondido Resources II, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 28 | Escondido Resources Oper Co, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 29 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 30 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 31 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 32 | Evans, S. Lavon Jr. Oper. Co. | Laurel, MS 39442 | Oil & Gas Operator | Jun 2025 |
| 33 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 34 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2025 |
| 35 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2025 |
| 36 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 37 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 38 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 39 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 40 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |