| 1 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 2 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2025 |
| 3 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2025 |
| 4 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Feb 2025 |
| 5 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 6 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 7 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 8 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 9 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 10 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 11 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 12 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 13 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 14 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 15 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 16 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 17 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 18 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 19 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 20 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 21 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 22 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 23 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 24 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |