| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | E & B Natural Resources Management Corporation | Hays, KS 67601 | Oil & Gas Operator | Aug 2025 |
| 2 | Earth Scientists | Oil Operator | Jan 1986 | |
| 3 | Eastern Petroleu | Oil & Gas Operator | Oct 1993 | |
| 4 | Elk City Oil Field Service | Elk City, KS 67344 | Oil Operator | Oct 1996 |
| 5 | Elmore Farm | Oil Operator | Sep 2009 | |
| 6 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 7 | Energy Sources I | Oil & Gas Operator | Jul 1986 | |
| 8 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 9 | Equinox Oil Comp | Oil Operator | Dec 1996 | |
| 10 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |