| 1 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 2 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 3 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2025 |
| 4 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 5 | En Geo, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Mar 2025 |
| 6 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 7 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 8 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 9 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 10 | Energy Hunter Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Feb 2019 |
| 11 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 12 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 13 | Engas XP, LLC | Wimberley, TX 78676 | Oil & Gas Operator | Mar 2025 |
| 14 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 15 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 16 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 17 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |