| 1 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 2 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 3 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 4 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 5 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 6 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 7 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 8 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 9 | Enbridge P/LS (La Intra.)L.L.C. | | Oil Operator | Oct 2009 |
| 10 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 11 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 12 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 13 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 14 | Energy Resource Technology Gom, LLC | | Oil & Gas Operator | Oct 2019 |
| 15 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 16 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 17 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 18 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 19 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 21 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 22 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 23 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 24 | Epl Oil & Gas, Inc | | Oil & Gas Operator | Aug 2015 |
| 25 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 26 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 27 | Euroamerican Energy Group Inc | | Oil & Gas Operator | Oct 1993 |
| 28 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 29 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 30 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 31 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |