| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2024 |
| 2 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 3 | Enertex, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 4 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 5 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 6 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 7 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |