| 1 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 2 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 3 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 4 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 5 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 6 | Eagle Petroleum Corporation | Holliday, TX 76366 | Oil & Gas Operator | Oct 2005 |
| 7 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 8 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 9 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 10 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 11 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 12 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Dec 2025 |
| 13 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 14 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 15 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 16 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 17 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 18 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 19 | Enerfin Resources II-92 L.P. | Houston, TX 77077 | Oil & Gas Operator | Sep 2025 |
| 20 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Aug 2025 |
| 21 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 22 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Dec 2025 |
| 23 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2025 |
| 24 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 25 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 26 | Enlo Energy Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 27 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 28 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 29 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 30 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 31 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 32 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 33 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Dec 2025 |
| 34 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 35 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 36 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 37 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Dec 2025 |
| 38 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Aug 2025 |
| 39 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Dec 2025 |
| 40 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Dec 2025 |
| 41 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 42 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 43 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Dec 2025 |
| 44 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 45 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |