| 1 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jul 2026 |
| 3 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2026 |
| 4 | Eiger Operating Company, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2026 |
| 5 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | May 2026 |
| 6 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 7 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 8 | Energy Operations Oklahoma LP | Houston, TX 77002-6785 | Oil & Gas Operator | Nov 2010 |
| 9 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 10 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 11 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 12 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 13 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 14 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |