| 1 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2026 |
| 3 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2026 |
| 4 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 5 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 6 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 7 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 9 | Encino Operating, LLC | Houston, TX 77008 | Oil & Gas Operator | Jun 2026 |
| 10 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 11 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 12 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 13 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 14 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 15 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 16 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 17 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 18 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 19 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 20 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 21 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 22 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 23 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 24 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 25 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2026 |
| 26 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 27 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 28 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Mar 2026 |
| 29 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 30 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2026 |