| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2026 |
| 2 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | May 2026 |
| 3 | Edf Trading Resources, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2015 |
| 4 | Edisto Resources Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 5 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 6 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 7 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | May 2026 |
| 9 | Empire Texas Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2026 |
| 10 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 11 | Energy & Expl. PRTNRS Oper., LP | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2016 |
| 12 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 13 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 14 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 15 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2026 |
| 16 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 17 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 18 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 19 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 20 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 21 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 22 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 23 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 24 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 25 | Etopsi Oil And Gas, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2026 |
| 26 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 27 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |
| 28 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | May 2026 |