| 1 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 2 | E2 Operating LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2024 |
| 3 | Eagle Valley Development LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2023 |
| 4 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Apr 2024 |
| 5 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 6 | Edwards, Gus Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2004 |
| 7 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Mar 2024 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 10 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 11 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 12 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 13 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 14 | Et Gathering & Processing LLC | San Antonio, TX 78258 | Oil Operator | Dec 2023 |
| 15 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 16 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 17 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 18 | Evolution Operating Company Inc | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 19 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
| 20 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Apr 2024 |
| 21 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |
| 22 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |