| 1 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Oct 2025 |
| 2 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 3 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 4 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 5 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 6 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 7 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 8 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 9 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Oct 2025 |
| 10 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 11 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 12 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 13 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 14 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 15 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 16 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 17 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 18 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 19 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |