| 1 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 2 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Oct 2025 |
| 3 | Eastco Gas Co. | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 4 | Eastland Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Oct 2025 |
| 5 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Oct 2025 |
| 7 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Oct 2025 |
| 8 | Edwards, James | Albany, TX 76430 | Oil & Gas Operator | Sep 2000 |
| 9 | El Dorado Resources Inc. | Waco, TX 76710 | Oil & Gas Operator | Oct 2009 |
| 10 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 11 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 12 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 13 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 14 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 15 | Enerdril Corporation | Moran, TX 76464 | Gas Operator | Dec 2015 |
| 16 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 17 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 18 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 19 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 20 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 21 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 22 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 23 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 24 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Oct 2025 |
| 25 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 26 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 27 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |