| 1 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 2 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 3 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 4 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 5 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2024 |
| 6 | Elysium Jennings, LLC | | Oil & Gas Operator | Jun 2024 |
| 7 | Endurance Oil & Gas, Inc. | Minden, LA 71055 | Oil & Gas Operator | Nov 2024 |
| 8 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 9 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 10 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2024 |
| 11 | Engeo Co. | | Oil & Gas Operator | Nov 1986 |
| 12 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 13 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 14 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 15 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 16 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 17 | Et Gathering & Processing LLC | San Antonio, TX 78258 | Oil Operator | Jun 2024 |
| 18 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 19 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 20 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 21 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Nov 2024 |
| 22 | Excel Operating Corporation | | Oil & Gas Operator | Jun 2024 |
| 23 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |