| 1 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 2 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 3 | Eagle Resources Inc | Claremore, OK 74019-5398 | Oil & Gas Operator | May 2013 |
| 4 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2026 |
| 5 | Earnest Russel | Okmulgee, OK 74447-1216 | Oil & Gas Operator | Jan 2007 |
| 6 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2026 |
| 7 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 8 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2026 |
| 9 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Feb 2026 |
| 10 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 11 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 12 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 13 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2026 |
| 14 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2026 |
| 15 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 16 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 17 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 18 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 19 | Endeavor Drilling, Inc. | Wagoner, OK 74467 | Oil Operator | Feb 2026 |
| 20 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 21 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 22 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 23 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 24 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 25 | Enhanced Hydrocarbons Inc | Claremore, OK 74017 | Oil & Gas Operator | May 2013 |
| 26 | Enterprise Energy Exploration Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Mar 2026 |
| 27 | Enterprise Energy Prod Co Inc | Tulsa, OK 74133-6754 | Oil & Gas Operator | Mar 2015 |
| 28 | Enterprise Exploration Inc | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2020 |
| 29 | Epperson Dwight | Okemah, OK 74859 | Oil Operator | Jan 2013 |
| 30 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 31 | Eskridge Production Company | Tulsa, OK 74112-1428 | Oil Operator | Sep 2019 |
| 32 | Ewsc Inc | Kenosha, WI 53142-3775 | Oil & Gas Operator | Apr 2020 |