| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 2 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 3 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 4 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 5 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 6 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 7 | Ef Energy, L.L.C. | Houston, TX 77084 | Oil & Gas Operator | Jun 2015 |
| 8 | El Dorado Gas & Oil, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 9 | El Dorado Resources Inc. | Waco, TX 76710 | Oil & Gas Operator | Oct 2009 |
| 10 | Eldon Oil Co. | Three Rivers, TX 78071 | Oil & Gas Operator | Jun 2025 |
| 11 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Jun 2025 |
| 12 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Jun 2025 |
| 13 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 14 | Energon3 | Rowlett, TX 75089 | Oil Operator | Jun 2025 |
| 15 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 16 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 17 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 18 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 19 | EP Energy E&P Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Jun 2025 |
| 20 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 21 | Escoba Royalty Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2005 |
| 22 | Escondido Resources II, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 23 | Escondido Resources Oper Co, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 24 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 25 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | Jun 2025 |
| 26 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 27 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 28 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 29 | Excalibur E & P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Jun 2025 |
| 30 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 31 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |