| 1 | E. B. Germany & Sons, LLC | | Oil & Gas Operator | Dec 2011 |
| 2 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 3 | Eagle Oil & Gas, LLC (Dba Eagle Oil & Gas Co.) | | Oil & Gas Operator | Dec 2021 |
| 4 | Easom, Dave Production Co Inc | | Oil & Gas Operator | Nov 1998 |
| 5 | East Bay Petroleum | | Oil & Gas Operator | Dec 1987 |
| 6 | Echols & Assoc. | | Oil Operator | Apr 1986 |
| 7 | Eclipse Petroleum | | Oil & Gas Operator | Aug 1991 |
| 8 | Edwards Producing Co.,Inc. | | Oil Operator | Jun 1987 |
| 9 | El Toro Oil Co. & Flagg Resc. | | Oil & Gas Operator | May 1993 |
| 10 | El Toro Production Co., Inc. | | Oil & Gas Operator | Jan 2016 |
| 11 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 12 | Elite Group LLC | | Oil & Gas Operator | Jun 2025 |
| 13 | Emerge Operating, LLC | | Oil & Gas Operator | Jul 2025 |
| 14 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 15 | Energy Dev Corp | | Oil & Gas Operator | Mar 1998 |
| 16 | Energy Exploration Company | | Oil & Gas Operator | Feb 1991 |
| 17 | Energy Production Service Inc | | Oil Operator | Mar 1986 |
| 18 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 19 | Enex Rexources Corp. | | Oil & Gas Operator | Jul 1981 |
| 20 | Enserch Exploration | | Oil & Gas Operator | Oct 1996 |
| 21 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 22 | Eor, LLC | | Oil & Gas Operator | Nov 2013 |
| 23 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 24 | Epstein Jr Oper Co | | Oil & Gas Operator | Mar 1991 |
| 25 | Escambia Operating Co. LLC | Gulfport, MS 39501 | Oil & Gas Operator | Jul 2025 |
| 26 | Estate Of William G. Helis | | Oil & Gas Operator | May 1994 |
| 27 | Ethyl Properties Inc. | | Oil & Gas Operator | Aug 1989 |
| 28 | Euromin Canada, Inc. | | Oil & Gas Operator | Mar 1987 |
| 29 | Exchange Exploration & Production Co. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2025 |
| 30 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 31 | Exxon Corporation -La | | Oil & Gas Operator | Sep 1989 |
| 32 | Exxon Corporation -TX | | Oil & Gas Operator | Jan 1982 |