| 1 | Eagle Creek Resources, LLC | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2024 |
| 2 | Eagle Road Oil LLC | Tulsa, OK 74103-3312 | Oil & Gas Operator | Apr 2025 |
| 3 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Apr 2025 |
| 4 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Apr 2025 |
| 5 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 6 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 7 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 9 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | May 2025 |
| 10 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 11 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 12 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 13 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Apr 2025 |
| 14 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Jul 2025 |
| 15 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 16 | England Operating LLC | Littleton, CO 80120-4529 | Oil & Gas Operator | Nov 2014 |
| 17 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 18 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 19 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 20 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 21 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 22 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 23 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 24 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 25 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |