| 1 | E. A. Courtney | | Oil & Gas Operator | Oct 1978 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2024 |
| 3 | Edgewood Exploration Inc. | | Oil & Gas Operator | Mar 1993 |
| 4 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | May 2024 |
| 5 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 6 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 7 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 8 | Elf Aquitaine Operating, Inc. | | Oil & Gas Operator | Jan 1992 |
| 9 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 10 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 11 | Elysium Jennings, LLC | | Oil & Gas Operator | Jun 2024 |
| 12 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 13 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 14 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 15 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 16 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 17 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 18 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 19 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 20 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 21 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 22 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2024 |
| 23 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 24 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 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 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 31 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Jul 2024 |
| 32 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 33 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Nov 2024 |
| 34 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jun 2024 |
| 35 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 36 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 37 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |