| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | E & B Natural Resources Management Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2025 |
| 2 | E & S Production Corp. | Oil & Gas Operator | Dec 1988 | |
| 3 | E & T Limited Liability Co. | Oil & Gas Operator | Mar 2025 | |
| 4 | E-Z Serve Of Ca Inc. | Oil Operator | Dec 1989 | |
| 5 | E. C. Green | Gas Operator | Dec 1989 | |
| 6 | Earth Basics Contracting Corp. | Oil & Gas Operator | Dec 2001 | |
| 7 | Eastern Pacific Oil Co. | Oil & Gas Operator | Dec 1998 | |
| 8 | Ecology Auto Wrecking | Oil Operator | Dec 2005 | |
| 9 | Edison Beneficial Reuse | Oil & Gas Operator | Mar 2025 | |
| 10 | Ehb Oil Company | Oil Operator | Dec 2001 | |
| 11 | El Dorado Exploration Co. | Oil Operator | Dec 1999 | |
| 12 | El Segundo Oil LLC | Oil Operator | Mar 2025 | |
| 13 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 14 | Elk Slough Pipeline Co. | Oil & Gas Operator | Dec 1999 | |
| 15 | Elliott Underground LLC | Oil Operator | Mar 2025 | |
| 16 | Emil & Ruby Plegel | Oil Operator | Dec 1989 | |
| 17 | Emil W. Plegel | Oil & Gas Operator | Mar 2025 | |
| 18 | Emjayco L. P. | Oil Operator | Dec 2020 | |
| 19 | Enerfin Resources Northwest Limited Partnership | Oil & Gas Operator | Jan 2022 | |
| 20 | Energy Development Of California Inc. | Oil & Gas Operator | Dec 2004 | |
| 21 | Energy Production & Sales Co. | Oil & Gas Operator | Dec 1999 | |
| 22 | Engineers Oil Company | Oil & Gas Operator | Apr 2025 | |
| 23 | Entex Oil Company | Gas Operator | Dec 1993 | |
| 24 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 25 | Estate Of George Cantor | Oil Operator | Dec 1988 | |
| 26 | Estate Of L. C. Dougan | Gas Operator | Dec 1987 | |
| 27 | Etchegoin Oil LLC | Oil & Gas Operator | Apr 2025 | |
| 28 | Eugene E. Marble | Oil Operator | Dec 1981 | |
| 29 | Evangelical Free Church | Oil & Gas Operator | Dec 1987 | |
| 30 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |