| 1201 | Exoro Energy, L.L.C. | | Oil & Gas Operator | Jun 2021 |
| 1202 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2025 |
| 1203 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 1204 | Expand Oper LLC | Morgantown, WV 26508 | Oil & Gas Operator | Dec 2025 |
| 1205 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 1206 | Expando Production Co. | | Oil & Gas Operator | Oct 1988 |
| 1207 | Expert Oil & Gas, L.L.C. | | Oil & Gas Operator | Nov 2024 |
| 1208 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 1209 | Exploration Associates | Oklahoma City, OK 73102-8606 | Oil & Gas Operator | Mar 2015 |
| 1210 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 1211 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 1212 | Exploration Energy Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2009 |
| 1213 | Exploration Professionals Inc | Chelsea, OK 74016-0066 | Oil Operator | Dec 2023 |
| 1214 | Exploration Techniques Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 1215 | Exploration Technologies Inc | Crescent, OK 73028-0546 | Oil & Gas Operator | Mar 2015 |
| 1216 | Explore Energy Corp. | Westerville, OH 43086 | Oil & Gas Operator | Dec 2016 |
| 1217 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 1218 | Express Energy Group, LLC | Atlanta, TX 75551 | Oil & Gas Operator | Feb 2026 |
| 1219 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Dec 2025 |
| 1220 | Express Oil And Gas | La Grange, TX 78945 | Oil & Gas Operator | Feb 2026 |
| 1221 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Feb 2026 |
| 1222 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Feb 2026 |
| 1223 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 1224 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 1225 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 1226 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 1227 | Extreme Energy Co | | Oil & Gas Operator | Sep 2025 |
| 1228 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 1229 | Exxo Resources Co | Dana, KY 41615 | Oil & Gas Operator | Dec 2023 |
| 1230 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 1231 | Exxon Corporatio | | Oil & Gas Operator | Dec 1995 |
| 1232 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 1233 | Exxon Corporation -La | | Oil & Gas Operator | Sep 1989 |
| 1234 | Exxon Corporation -TX | | Oil & Gas Operator | Jan 1982 |
| 1235 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 1236 | Exxonmobil Alaska Production Inc. | | Oil & Gas Operator | Oct 2021 |
| 1237 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Nov 2025 |
| 1238 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | Feb 2026 |
| 1239 | Eylau Oil Inc. | Atlanta, TX 75551 | Oil & Gas Operator | Oct 2021 |
| 1240 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 1241 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2025 |
| 1242 | Eyler Nelson E | | Oil Operator | Nov 1998 |
| 1243 | Eyster Oil Company LLC | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2024 |
| 1244 | Ez Oil Corp | Cushing, OK 74023 | Oil & Gas Operator | Dec 2025 |