| 1 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 2 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 3 | Eakin Brothers | Pampa, TX 79065 | Gas Operator | Mar 2025 |
| 4 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2025 |
| 5 | Elendil Resources LLC | Pampa, TX 79066 | Oil & Gas Operator | Mar 2025 |
| 6 | Empire Operating, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 7 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 8 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 9 | Energon Oil & Gas Inc. | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 10 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2025 |
| 11 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Mar 2025 |
| 12 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 13 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 14 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 15 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2024 |
| 16 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 17 | Estate Of Jerome B. Herrmann | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2022 |
| 18 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 19 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 20 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 21 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 22 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Mar 2025 |
| 23 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |