| 1 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 2 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 3 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 4 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 5 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 6 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 7 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 8 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 9 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 10 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 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 Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 15 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 16 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 17 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 18 | Energyquest Operating, L.L.C. | | Oil & Gas Operator | Jun 2023 |
| 19 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 20 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 21 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 22 | Epoch Petroleum Corporation | | Oil & Gas Operator | Dec 1992 |
| 23 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 24 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Oct 2025 |
| 25 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 26 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 27 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 28 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 29 | Exoro Energy, L.L.C. | | Oil & Gas Operator | Jun 2021 |
| 30 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 31 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |