| 1 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 3 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2025 |
| 4 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 5 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 6 | Ehvi Exploration LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 7 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 9 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 10 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 11 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 12 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 13 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 14 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 15 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 16 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 17 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 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 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 21 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 22 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 23 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 24 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 25 | Excalibur Resources LLC | Houston, TX 77002-5220 | Oil & Gas Operator | Feb 2025 |
| 26 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 27 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 28 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 29 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |