| 1 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 2 | Eagle Oil & Gas Properties Inc | Pleasant Prarie, WI 53158-4719 | Oil & Gas Operator | Jan 2016 |
| 3 | Earth Oil Inc | Skiatook, OK 74070-0578 | Oil & Gas Operator | Oct 2008 |
| 4 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 5 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jul 2025 |
| 6 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jul 2025 |
| 7 | Ellard I W | Bixby, OK 74008-0220 | Oil & Gas Operator | Jan 2007 |
| 8 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2025 |
| 9 | Emery Billie E | Skiatook, OK 74070 | Oil Operator | Feb 2025 |
| 10 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | Jun 2025 |
| 11 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 12 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 13 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Jul 2025 |
| 14 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 15 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 16 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 17 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 18 | Enloe Jenny L | Skiatook, OK 74070 | Oil Operator | Nov 1998 |
| 19 | Eskridge Oil & Supply | Tulsa, OK 74105 | Oil Operator | Aug 2014 |
| 20 | Eskridge Production Company | Tulsa, OK 74112-1428 | Oil Operator | Sep 2019 |
| 21 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 22 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | Jul 2025 |