| 1 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2023 |
| 2 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 3 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 4 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 5 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 6 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 7 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 8 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 9 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 10 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 11 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 12 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 13 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 14 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 15 | Et Gathering & Processing LLC | San Antonio, TX 78258 | Oil Operator | Dec 2023 |
| 16 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 17 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 18 | Excel Operating Corporation | | Oil & Gas Operator | Dec 2023 |