| 1 | Eagle Energy Production LLC | | Oil & Gas Operator | Mar 2020 |
| 2 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 3 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 4 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Feb 2024 |
| 5 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jan 2024 |
| 6 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Dec 2023 |
| 7 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 8 | Edwards Johnny E | Drumright, OK 74030 | Oil Operator | Apr 2011 |
| 9 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 10 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 11 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Feb 2024 |
| 12 | Egret Operating Company | Muskogee, OK 74402-1871 | Oil & Gas Operator | Jan 2024 |
| 13 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 14 | Eleven K Oil & Gas LLC | | Oil Operator | Feb 2024 |
| 15 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 16 | Elite Resources Inc | Cleveland, OK 74020-0614 | Oil & Gas Operator | Feb 2024 |
| 17 | Emmaus Energy LLC | | Oil & Gas Operator | Aug 2022 |
| 18 | Encore Operating Inc | | Oil Operator | Jan 2024 |
| 19 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Jan 2024 |
| 20 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 21 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Jan 2024 |
| 22 | Energy Three, Inc. | Jackson, MS 39211 | Oil & Gas Operator | Jan 2024 |
| 23 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 24 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 25 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 26 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Jan 2024 |
| 27 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 28 | Eubank Operating Company | Cushing, OK 74023-0788 | Oil & Gas Operator | Jan 2024 |
| 29 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 30 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2024 |