| 1 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 2 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Oct 2025 |
| 3 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 4 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 5 | Ecapa Energy Company | Holliday, TX 76366 | Oil Operator | Oct 2025 |
| 6 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 7 | Edge Oil & Gas Properties | Archer City, TX 76351 | Oil & Gas Operator | Oct 2025 |
| 8 | Edge, Fred Well Service Co. | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 9 | Efficiency Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 10 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 11 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 12 | Elephant Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2015 |
| 13 | Ellis, Amon | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 14 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Oct 2025 |
| 15 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | Oct 2025 |
| 16 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 17 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 18 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 19 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 20 | Enloe Oil Company | Olney, TX 76374 | Oil & Gas Operator | Jun 2000 |
| 21 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 22 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 23 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 24 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 25 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 26 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Oct 2025 |
| 27 | Estate Of C.B. Christie Jr | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 28 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 29 | Exlco, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 30 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 31 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Oct 2025 |
| 32 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |