| 1 | E-Z Mart Stores, Inc. | | Oil Operator | Jul 2004 |
| 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 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 5 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 6 | Energy Program Accompany | | Oil Operator | Dec 2006 |
| 7 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 8 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 9 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 10 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 11 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 12 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 13 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 14 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 15 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 16 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 17 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Oct 2025 |
| 18 | Excel Operating Corporation | | Oil & Gas Operator | Dec 2024 |