| 1 | Ea Petroleum Inc | Norman, OK 73072-4147 | Oil & Gas Operator | May 2006 |
| 2 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 3 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2026 |
| 4 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2026 |
| 5 | Easterwood D E | Duncan, OK 73533-1013 | Oil & Gas Operator | Jun 2001 |
| 6 | Eby Frank V Corporation | Yukon, OK 73085-0860 | Oil Operator | Sep 2016 |
| 7 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 8 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 9 | Edwards Jr L A | Duncan, OK 73534-1348 | Oil & Gas Operator | Sep 1992 |
| 10 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 11 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2026 |
| 12 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 13 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 14 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 15 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | Mar 2026 |
| 16 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 17 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 18 | Energy Operating Corporation | Plano, TX 75093-4409 | Oil & Gas Operator | Sep 2013 |
| 19 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 20 | Ennex Inc | | Oil & Gas Operator | Oct 1993 |
| 21 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 22 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 23 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 24 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 25 | Excel Operating Inc | Dallas, TX 75234-7300 | Oil & Gas Operator | Jun 2022 |
| 26 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 27 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 28 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2026 |