| 1 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 2 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 4 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 5 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 6 | Eastex Crude Company, LLC | Leesburg, TX 75451 | Oil & Gas Operator | Jul 2025 |
| 7 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 8 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 9 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 10 | Egi, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 11 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 12 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Jul 2025 |
| 13 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 14 | Elevation Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 15 | Elkhorn Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 1995 |
| 16 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2025 |
| 17 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Jul 2025 |
| 18 | En Geo, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2025 |
| 19 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 20 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 21 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 22 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 23 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | May 2025 |
| 24 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 25 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 26 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 27 | Energy Service Investment Corp. | Tulsa, OK 74137 | Oil & Gas Operator | May 2006 |
| 28 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 29 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Jul 2025 |
| 30 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2025 |
| 31 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 32 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 33 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 34 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 35 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 36 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 37 | Epic Permian Operating, LLC | Arvada, CO 80006 | Oil & Gas Operator | Jan 2025 |
| 38 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 39 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 40 | Eureka Gas Co, Inc | Pikeville, KY 41502 | Gas Operator | Dec 2010 |
| 41 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 42 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 43 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 44 | Exxcel Operating Company | San Antonio, TX 78227 | Oil & Gas Operator | Jul 2025 |
| 45 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 46 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |