| 1 | Eagle Creek Resources, LLC | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2023 |
| 2 | Eagle Energy Production LLC | | Oil & Gas Operator | Mar 2020 |
| 3 | Eagle Exploration Production LLC | | Oil & Gas Operator | Feb 2024 |
| 4 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Jan 2024 |
| 5 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jan 2024 |
| 6 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2024 |
| 7 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 8 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Feb 2024 |
| 9 | Egret Operating Company | Muskogee, OK 74402-1871 | Oil & Gas Operator | Jan 2024 |
| 10 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 11 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 12 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2024 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 14 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 15 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 16 | Equal Energy Us Inc | | Oil & Gas Operator | Nov 2019 |
| 17 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 18 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 19 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 20 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 21 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |