| 1 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 2 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 3 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Oct 2025 |
| 4 | Earthbound Resources LLC | Merkel, TX 79536 | Oil & Gas Operator | Oct 2025 |
| 5 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | Edington Oil Company | Albany, TX 76430 | Oil & Gas Operator | Aug 2006 |
| 7 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 8 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 9 | Ellard, Herman | Graham, TX 76450 | Oil & Gas Operator | Feb 2005 |
| 10 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Oct 2025 |
| 11 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 12 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 13 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 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 | Energy Well Service, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2004 |
| 17 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 18 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 19 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 20 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 21 | Erson Royalty Company, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Feb 2006 |
| 22 | Esna Operating Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1994 |
| 23 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Oct 2025 |
| 24 | Everett, Joe Mack | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2025 |
| 25 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 26 | Exlco, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 27 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 28 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 29 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |