| 1 | E & E Production Company, Inc. | | Oil & Gas Operator | Dec 2004 |
| 2 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 3 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 4 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 5 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | May 2024 |
| 6 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 7 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 8 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 9 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 10 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 11 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2024 |
| 12 | Elsbury & Acker | | Oil & Gas Operator | Feb 2003 |
| 13 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 14 | Emerald Oil Co. | | Oil & Gas Operator | Apr 1980 |
| 15 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 16 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 17 | Energy Source, Inc.-Emerald | | Oil & Gas Operator | Apr 1983 |
| 18 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 19 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 20 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 21 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 22 | Energyquest Operating, L.L.C. | | Oil & Gas Operator | Jun 2023 |
| 23 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2024 |
| 24 | Enlink Lig, LLC | | Oil Operator | Jul 2024 |
| 25 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 26 | Enstar Petroleum Company | | Oil & Gas Operator | Jul 1985 |
| 27 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 28 | Entex Petroleum, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 29 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 30 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Jul 2024 |
| 31 | Ereunao Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2003 |
| 32 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Dec 2024 |
| 33 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 34 | Ethyl-Buchanan | | Oil & Gas Operator | Jan 1987 |
| 35 | Eugene Talbert Operg. Co. Inc. | | Oil & Gas Operator | Mar 2013 |
| 36 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 37 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 38 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 39 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |