| 1201 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 1202 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2025 |
| 1203 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 1204 | Extreme Energy Co | | Oil & Gas Operator | Oct 2024 |
| 1205 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Feb 2025 |
| 1206 | Exxo Resources Co | Dana, KY 41615 | Oil & Gas Operator | Dec 2022 |
| 1207 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 1208 | Exxon Corporatio | | Oil & Gas Operator | Dec 1995 |
| 1209 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 1210 | Exxon Corporation -La | | Oil & Gas Operator | Sep 1989 |
| 1211 | Exxon Corporation -TX | | Oil & Gas Operator | Jan 1982 |
| 1212 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2025 |
| 1213 | Exxonmobil Alaska Production Inc. | | Oil & Gas Operator | Oct 2021 |
| 1214 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 1215 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | Feb 2025 |
| 1216 | Eylau Oil Inc. | Atlanta, TX 75551 | Oil & Gas Operator | Oct 2021 |
| 1217 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 1218 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2024 |
| 1219 | Eyler Nelson E | | Oil Operator | Nov 1998 |
| 1220 | Eyster Oil Company LLC | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2023 |