| 1 | Ea Petroleum Inc | Norman, OK 73072-4147 | Oil & Gas Operator | May 2006 |
| 2 | Eagle Exploration Production LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 3 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 4 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2025 |
| 5 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2025 |
| 6 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 7 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 8 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Mar 2025 |
| 9 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 10 | Eight Round Corporation | Seminole, OK 74818-1482 | Oil & Gas Operator | Jul 2012 |
| 11 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 12 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 13 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2025 |
| 14 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 15 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 16 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 17 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 18 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 19 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2025 |
| 20 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 21 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 22 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 23 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 24 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 25 | Ennex, Inc. | | Oil & Gas Operator | Oct 1993 |
| 26 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 27 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 28 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 29 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 30 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 31 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 32 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 33 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 34 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 35 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 36 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 37 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 38 | Excalibur Resources LLC | Houston, TX 77002-5220 | Oil & Gas Operator | Feb 2025 |
| 39 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 40 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 41 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |