| 1 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 2 | Ed Shea | | Oil Operator | Sep 1990 |
| 3 | Edwin L Cox-Michael Halbouty | | Oil & Gas Operator | Jun 1986 |
| 4 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 5 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 6 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 7 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 8 | Energy Recovery Group, LLC | | Oil & Gas Operator | Jul 2008 |
| 9 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 10 | Energy Xxi Gulf Coast, Inc. | | Oil & Gas Operator | Dec 2008 |
| 11 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 12 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 13 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 14 | Enlink Lig, LLC | | Oil Operator | Jul 2024 |
| 15 | Enstar Petroleum Company | | Oil & Gas Operator | Jul 1985 |
| 16 | Enterprise Resources Inc. | | Oil & Gas Operator | Jun 1979 |
| 17 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Jul 2024 |
| 18 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 19 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 20 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 21 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 22 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |