| 1 | Eagle Exploration Production LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 3 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Jan 2026 |
| 4 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jan 2026 |
| 5 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Jan 2026 |
| 6 | Eckard Operating, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2026 |
| 7 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 8 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 9 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 10 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 11 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 12 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 13 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | Jan 2026 |
| 14 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 15 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 16 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 17 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 18 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 19 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 20 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 21 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 22 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 23 | Entex Petroleum Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 24 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 25 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 26 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 27 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 28 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 29 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 30 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 31 | Eubank Operating Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2024 |
| 32 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 33 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2026 |
| 34 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2026 |
| 35 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 36 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |