| 1 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 3 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 4 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 5 | Ehvi Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 6 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 7 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 8 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 9 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Sep 2026 |
| 10 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 11 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Apr 2026 |
| 12 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 14 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 15 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 16 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Sep 2026 |
| 17 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 18 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 19 | Etc Field Services LLC | Dallas, TX 75225 | Oil Operator | Jun 2018 |
| 20 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 21 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2026 |
| 22 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 23 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |