| 1 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 2 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 4 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Feb 2026 |
| 5 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Feb 2026 |
| 6 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 7 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 8 | Edwards-Foster, Inc. | Midland, TX 79708 | Oil & Gas Operator | Aug 1996 |
| 9 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 10 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 11 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 12 | Elk Meadows Resources LLC | Houston, TX 77037 | Oil & Gas Operator | Jan 2021 |
| 13 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 14 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 15 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 16 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 17 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 18 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Feb 2023 |
| 19 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Nov 2025 |
| 20 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2025 |
| 21 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 22 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 23 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Feb 2026 |
| 24 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 25 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 26 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 27 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 28 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 29 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 30 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 31 | Etl Hydrocarbons, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 32 | Evinger, Ernest E. | Midland, TX 79705 | Oil & Gas Operator | Mar 2002 |
| 33 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 34 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 35 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 36 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 37 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 38 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Sep 2025 |