| 1 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Jan 2025 |
| 2 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jan 2025 |
| 3 | Eberle C Fred | Blackwell, OK 74631 | Oil Operator | Jun 1993 |
| 4 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 5 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 6 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Jan 2025 |
| 7 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Feb 2025 |
| 8 | Empire Petroleum LLC | Salt Lake City, UT 84121-7021 | Oil & Gas Operator | Jun 2019 |
| 9 | Enmark Gas Gathering L. P. | Dallas, TX 75252 | Oil & Gas Operator | Oct 2024 |
| 10 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 11 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 12 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 13 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 14 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 15 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |