| 1 | E.C. Hindman Oil And Gas | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2026 |
| 2 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jul 2026 |
| 4 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jul 2026 |
| 5 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 6 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Jul 2026 |
| 7 | Empire Exploration Corp. 1989 | Lebanon, MO 65536 | Oil & Gas Operator | Mar 2003 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 10 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Apr 2026 |
| 11 | Energy Well Service, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2004 |
| 12 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Jul 2026 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 14 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 15 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 16 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 17 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 18 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jul 2026 |
| 19 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 20 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 21 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Jul 2026 |
| 22 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 23 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Jul 2026 |
| 24 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2026 |
| 25 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2026 |