| 201 | Ethyl-Buchanan | | Oil & Gas Operator | Feb 1987 |
| 202 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 203 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 204 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 205 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 206 | Eugene Talbert Operating Co. | | Oil & Gas Operator | Mar 2013 |
| 207 | Euroamerican Energy Group, Inc | | Oil & Gas Operator | Oct 1993 |
| 208 | Eurovest Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 209 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jan 2025 |
| 210 | Evangeline Oil Prod. Co., Inc. | | Oil Operator | Apr 2001 |
| 211 | Evangeline Operating Co., Inc. | | Oil Operator | Jun 1989 |
| 212 | Evangeline Pumpers, Inc. | | Oil & Gas Operator | Jul 2005 |
| 213 | Evans Brothers | | Oil & Gas Operator | Jan 2025 |
| 214 | Evergreen Operating Co., LTD. | McAllen, TX 78502 | Oil & Gas Operator | Feb 2026 |
| 215 | Excalibur Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 216 | Excalibur Resources, Inc. | | Oil & Gas Operator | Apr 1986 |
| 217 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Feb 2026 |
| 218 | Excel Operating Corporation | | Oil & Gas Operator | Dec 2024 |
| 219 | Excel Royalty Company, LLC | | Oil Operator | Jun 2022 |
| 220 | Excelsior Oil Corporation | | Oil & Gas Operator | May 1985 |
| 221 | Exchange Expl & Prodn Co | | Oil Operator | Oct 2023 |
| 222 | Exchange Oil & Gas Company | | Oil & Gas Operator | Oct 1996 |
| 223 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 224 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 225 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 226 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 227 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 228 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 229 | Exodus Energy, Inc. | Huntington Beach, CA 92615 | Oil & Gas Operator | Jul 2018 |
| 230 | Exoro Energy, L.L.C. | | Oil & Gas Operator | Jun 2021 |
| 231 | Expando Production Co. | | Oil & Gas Operator | Oct 1988 |
| 232 | Expert Oil & Gas, L.L.C. | | Oil & Gas Operator | Nov 2024 |
| 233 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 234 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 235 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |