| 1 | E W D Oil | Winters, TX 79567 | Oil & Gas Operator | Oct 2025 |
| 2 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 4 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 5 | Edco Petroleum, Inc. | Dallas, TX 75202 | Oil & Gas Operator | Mar 2005 |
| 6 | Edgar, Verlon | Belle Chasse, LA 70037 | Oil & Gas Operator | Feb 1998 |
| 7 | Edinburgh Energy Partners, LLC | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 8 | Edmondson Oil & Gas | Ballinger, TX 76821 | Oil & Gas Operator | Oct 2025 |
| 9 | Edwards, Gus Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2004 |
| 10 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 11 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 12 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 13 | Elco Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 14 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 15 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 16 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 17 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 19 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 20 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 21 | Eor Operating Company | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |
| 22 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 23 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 24 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 25 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 26 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 27 | Evangeline Trading Company | Ballinger, TX 76821 | Oil & Gas Operator | Oct 2025 |
| 28 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 29 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2025 |
| 30 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |