| 1 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Dec 2023 |
| 2 | Eason Petroleum Company | | Oil & Gas Operator | Jan 2020 |
| 3 | East Hampton Estates, LLC | Hampton, AR 71744 | Oil Operator | Feb 2024 |
| 4 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 5 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 6 | Emco Operating Company, Inc | | Oil Operator | Jul 2011 |
| 7 | Enerco Operating Corporation | Dallas, TX 75230 | Oil & Gas Operator | Feb 2024 |
| 8 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 9 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 10 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 11 | Estes, Kenneth B - Pe | | Oil & Gas Operator | Aug 2019 |
| 12 | Everett, Jack T | | Oil Operator | Mar 2010 |
| 13 | Exok, Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2023 |
| 14 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 15 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 16 | Eylau Oil Inc. | Atlanta, TX 75551 | Oil & Gas Operator | Oct 2021 |