| 1 | E.C. Hindman Oil And Gas | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 2 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 3 | Eastland Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Apr 2026 |
| 4 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Apr 2026 |
| 5 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Apr 2026 |
| 6 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 7 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 8 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 9 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 10 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 11 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 12 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 13 | Enstar Energy, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Apr 2026 |
| 14 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 15 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 16 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 17 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 18 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Apr 2026 |
| 19 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 20 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 21 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 22 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Apr 2026 |
| 23 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Apr 2026 |
| 24 | Evarado Oil, LLC | Strawn, TX 76475 | Oil & Gas Operator | Apr 2026 |
| 25 | Everest Network LLC | Eastland, TX 76448 | Oil & Gas Operator | Apr 2026 |
| 26 | Excel Energy, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2026 |
| 27 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2026 |
| 28 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 29 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |