| 1 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 2 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 3 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 4 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 5 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Feb 2025 |
| 6 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 7 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 8 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 9 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 10 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 11 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 12 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Feb 2025 |
| 13 | Eichenber A H Co | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2002 |
| 14 | El Coqui' Oil Company | Tussy, OK 73088 | Oil & Gas Operator | Oct 2009 |
| 15 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 16 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 17 | Energy Exchange Corporation | Oklahoma City, OK 73112 | Oil Operator | Feb 2025 |
| 18 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 19 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 20 | Epley Bobbie Inc | Wilson, OK 73463-6319 | Oil Operator | Jun 2007 |
| 21 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 22 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 23 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 24 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 25 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2025 |