| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 2 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Jun 2025 |
| 3 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 4 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 5 | Edge Barnett Operating Comp LLC | Fort Worth, TX 76107 | Gas Operator | Nov 2013 |
| 6 | Edge Resources Operating, L.L.C. | Fort Worth, TX 76107 | Gas Operator | Jan 2020 |
| 7 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Jun 2025 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 10 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 11 | Energy From Texas, L. P. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2013 |
| 12 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 14 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 15 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 16 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 17 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 18 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Oct 2025 |