| 1 | E & E Production Company, Inc. | | Oil & Gas Operator | Dec 2004 |
| 2 | E Lee Mills | | Oil Operator | Aug 1987 |
| 3 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 4 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 5 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 6 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 7 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 8 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 9 | El-Oil, LTD. | | Oil & Gas Operator | Nov 2024 |
| 10 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 11 | Eldon Radke | | Oil Operator | May 2001 |
| 12 | Elf Aquitaine Operating, Inc. | | Oil & Gas Operator | Jan 1992 |
| 13 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 14 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 15 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 16 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 17 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 18 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 19 | Energy Investments Inc | | Oil & Gas Operator | Aug 2025 |
| 20 | Energy Research & Dev. Corp. | | Oil & Gas Operator | Feb 1998 |
| 21 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 22 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 23 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 24 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 25 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 26 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 27 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 28 | Equipment, Inc. | | Oil & Gas Operator | Mar 1983 |
| 29 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 30 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 31 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 32 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 33 | Evangeline Oil Prod. Co., Inc. | | Oil Operator | Apr 2001 |
| 34 | Evangeline Operating Co., Inc. | | Oil Operator | Jun 1989 |
| 35 | Exodus Energy, Inc. | Huntington Beach, CA 92615 | Oil & Gas Operator | Jul 2018 |
| 36 | Expando Production Co. | | Oil & Gas Operator | Oct 1988 |
| 37 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 38 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |