| 1 | E M V Company | | Oil Operator | Oct 2003 |
| 2 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Aug 2025 |
| 3 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 4 | East Cheyenne Gas Storage LLC | | Oil Operator | Aug 2025 |
| 5 | East Resources Management LLC | | Oil Operator | Oct 2010 |
| 6 | Eastco Operating LLC | | Oil & Gas Operator | Jun 2025 |
| 7 | Eddy Oil Company | | Oil & Gas Operator | May 2013 |
| 8 | Eddy* Harold E & Florence L | | Oil Operator | Jun 2010 |
| 9 | Edge Energy II LLC | Golden, CO 80401 | Oil & Gas Operator | Jul 2025 |
| 10 | Edge Energy LLC | | Oil & Gas Operator | Jul 2025 |
| 11 | Edwards Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 12 | Ee3 LLC | | Oil & Gas Operator | Nov 2015 |
| 13 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 14 | El Paso Energy Raton LLC | | Gas Operator | Sep 2008 |
| 15 | Elk Exploration Inc | | Oil & Gas Operator | Jul 2001 |
| 16 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2010 |
| 17 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 18 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 19 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 20 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 21 | Endeavour Operating Corp | Denver, CO 80202-2000 | Oil & Gas Operator | Sep 2015 |
| 22 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jul 2025 |
| 23 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 24 | Energy Alliance Company Inc | | Oil & Gas Operator | Jan 2018 |
| 25 | Energy Investments Inc | | Oil & Gas Operator | Aug 2025 |
| 26 | Energy Oil And Gas Inc | | Oil & Gas Operator | Dec 2010 |
| 27 | Energy Operations Colorado LP | | Oil & Gas Operator | Nov 2009 |
| 28 | Energy Operatng Company Inc | | Oil & Gas Operator | Jan 2000 |
| 29 | Energy Search Company Inc | Aurora, CO 80011 | Oil & Gas Operator | Jun 2021 |
| 30 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 31 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 32 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 33 | Enervest San Juan Operating | | Gas Operator | Jul 2001 |
| 34 | Enprop Inc | | Oil & Gas Operator | Feb 2013 |
| 35 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 36 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 37 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 38 | EP Energy Management LLC | | Oil & Gas Operator | Jun 2006 |
| 39 | Epic Energy LLC | Aztec, NM 87410 | Oil & Gas Operator | Jul 2025 |
| 40 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 41 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 42 | Evergreen Natural Resources LLC | | Gas Operator | Aug 2025 |
| 43 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 44 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 45 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 46 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 47 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jul 2025 |