| 1 | Edge Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 1999 |
| 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 | El-Oil, LTD. | | Oil & Gas Operator | Dec 2023 |
| 5 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 6 | Energy Recovery Group, LLC | | Oil & Gas Operator | Jul 2008 |
| 7 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2024 |
| 8 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 9 | Eor, LLC | | Oil & Gas Operator | Nov 2013 |
| 10 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 11 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 12 | Escambia Operating Co. LLC | Gulfport, MS 39501 | Oil & Gas Operator | Nov 2023 |
| 13 | Esco Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2009 |
| 14 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Nov 2023 |
| 15 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |