| 201 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 202 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 203 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 204 | Eubank Michael Dba Trilby Oil Company | Amber, OK 73004-4903 | Oil Operator | May 2022 |
| 205 | Eubank Operating Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2024 |
| 206 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 207 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 208 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 209 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 210 | Ew Carter Oil Co;Inc | | Oil & Gas Operator | Aug 2025 |
| 211 | Ewsc Inc | Kenosha, WI 53142-3775 | Oil & Gas Operator | Apr 2020 |
| 212 | Excalibur Resources LLC | Houston, TX 77002-5220 | Oil & Gas Operator | Aug 2025 |
| 213 | Excel Operating Inc | Dallas, TX 75234-7300 | Oil & Gas Operator | Jun 2022 |
| 214 | Excel Production Inc | Lubbock, TX 79424-2341 | Oil Operator | Apr 2020 |
| 215 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 216 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Aug 2025 |
| 217 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2025 |
| 218 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 219 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 220 | Exploration Associates | Oklahoma City, OK 73102-8606 | Oil & Gas Operator | Mar 2015 |
| 221 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 222 | Exploration Professionals Inc | Chelsea, OK 74016-0066 | Oil Operator | Dec 2023 |
| 223 | Exploration Technologies Inc | Crescent, OK 73028-0546 | Oil & Gas Operator | Mar 2015 |
| 224 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 225 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Sep 2025 |
| 226 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 227 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 228 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 229 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 230 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | Aug 2025 |
| 231 | Eyler Nelson E | | Oil Operator | Nov 1998 |