| 1 | E.C. Production, L.L.C. | Rosenberg, TX 77471 | Oil & Gas Operator | May 2024 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 3 | Eastern Energy Corporation | Bowling Green, KY 42104 | Oil & Gas Operator | Dec 2014 |
| 4 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 5 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 6 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 7 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 8 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 9 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 10 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 11 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 12 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 13 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 14 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
| 15 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 16 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |