| 1 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 2 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 3 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 4 | Eastern Petroleum Company | Girard, OH 44420 | Oil & Gas Operator | Sep 1995 |
| 5 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 6 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 7 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 8 | Elevation Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 9 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 10 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 11 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 12 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 14 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 15 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 16 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 17 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 18 | Escondido Bay Corporation | Dallas, TX 75202 | Oil Operator | Oct 2025 |
| 19 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 20 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 21 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Oct 2025 |
| 22 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 23 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 24 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |