| 1 | E Texas Production MGMT Co Inc | | Oil & Gas Operator | Oct 1996 |
| 2 | East Ajax Oil Corporation | | Oil & Gas Operator | May 2000 |
| 3 | Eddy Enterprises, Inc. | | Oil & Gas Operator | Sep 2023 |
| 4 | Egh Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 5 | Eli Rebich | | Oil & Gas Operator | Dec 1986 |
| 6 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 7 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 10 | Energy Exploration Co | | Oil & Gas Operator | Feb 1991 |
| 11 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 12 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 13 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 14 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 15 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 16 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 17 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 18 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 19 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 20 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 21 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |