| 1 | Eagle Creek Colony | Galata, MT 59444 | Oil & Gas Operator | Dec 2024 |
| 2 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 3 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Jan 2025 |
| 4 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 5 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jan 2025 |
| 6 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 7 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 8 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2025 |
| 9 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 10 | Enclave Operating, LLC | Shelby, MT 59474 | Oil & Gas Operator | May 2014 |
| 11 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 12 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 13 | Energy Corporation Of America | Charleston, WV 25311 | Oil & Gas Operator | Dec 2022 |
| 14 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Jan 2025 |
| 15 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2024 |
| 16 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 17 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 18 | Equinor Energy LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2021 |
| 19 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |
| 20 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |