| 1 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2026 |
| 2 | Eagle Oil & Gas Properties Inc | Pleasant Prarie, WI 53158-4719 | Oil & Gas Operator | Jan 2016 |
| 3 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Mar 2026 |
| 4 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 5 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Apr 2026 |
| 6 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 7 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 8 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2026 |
| 9 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 10 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 11 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 12 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2026 |
| 13 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 14 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 15 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 16 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2026 |
| 17 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 18 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 19 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 20 | Ennis Bill H | Sasakwa, OK 74867-0001 | Oil & Gas Operator | Sep 2014 |
| 21 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 22 | Excel Production Inc | Lubbock, TX 79424-2341 | Oil Operator | Apr 2020 |
| 23 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2026 |
| 24 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 25 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jun 2026 |
| 26 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Apr 2026 |
| 27 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |