| 1 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 2 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2025 |
| 3 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 4 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 5 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 6 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 7 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 8 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 9 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 10 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 11 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 12 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 13 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 14 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 15 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 16 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2025 |
| 17 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 18 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 19 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |