| 1 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 2 | Edgewater Oil Co. Inc. | | Oil & Gas Operator | Jul 1995 |
| 3 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 4 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 5 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 6 | El Paso Production Gom, Inc. | | Oil & Gas Operator | Nov 2005 |
| 7 | Elad Petroleum Corporation | | Oil Operator | Jun 2005 |
| 8 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 9 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 10 | Enbridge Offshore Pipelines(Seacrest) LP | | Oil Operator | Oct 2009 |
| 11 | Energy Xxi Gulf Coast, Inc. | | Oil & Gas Operator | Dec 2008 |
| 12 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 13 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 14 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 15 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 16 | Entex Petroleum, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 17 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 18 | Exchange Oil & Gas Company | | Oil & Gas Operator | Oct 1996 |
| 19 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 20 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 21 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |