| 1 | Earthbound Energy LLC | Merkel, TX 79536 | Oil Operator | Feb 2026 |
| 2 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Feb 2026 |
| 3 | Eastex Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2003 |
| 4 | Edmonds, Karl F. Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2005 |
| 5 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 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 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 9 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2026 |
| 10 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 11 | Embassy Well Service, LLC | Carrollton, TX 75011 | Oil & Gas Operator | Feb 2026 |
| 12 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 13 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 14 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Dec 2025 |
| 15 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 16 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 17 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Feb 2026 |
| 18 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Nov 2025 |
| 19 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 20 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 21 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2026 |
| 22 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 23 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 24 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 25 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 26 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 27 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 28 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 29 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 30 | Etos Operating, Inc. | New London, TX 75682 | Oil & Gas Operator | Feb 2026 |
| 31 | Ev Fleming Enterprises, LLC | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2024 |
| 32 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Feb 2026 |
| 33 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 34 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 35 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 36 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 37 | Executive Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Feb 2026 |
| 38 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 39 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 40 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | Feb 2026 |