| 1 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 2 | Eagle Exploration Production LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 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 | Mar 2025 |
| 5 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Mar 2025 |
| 6 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 7 | Easterwood D E | Duncan, OK 73533-1013 | Oil & Gas Operator | Jun 2001 |
| 8 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Mar 2025 |
| 9 | Eckard Operating, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 10 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 11 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 12 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 13 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Mar 2025 |
| 14 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Mar 2025 |
| 15 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 16 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Apr 2025 |
| 17 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 18 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 19 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Mar 2025 |
| 20 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 21 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 22 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 23 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 24 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 25 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 26 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 27 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 28 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 29 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 30 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 31 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 32 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 33 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 34 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 35 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jun 2025 |
| 36 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 37 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |