| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & B Energy Corporation | San Antonio, TX 78264 | Oil Operator | Apr 2026 |
| 2 | Delgado, Emil A | San Antonio, TX 78223 | Oil & Gas Operator | Sep 2016 |
| 3 | Denpac Corporation | Colorado SPGS, CO 80922 | Oil & Gas Operator | Apr 2026 |
| 4 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | Apr 2026 |
| 5 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 6 | Downing Well Service, Inc. | Devine, TX 78016 | Oil & Gas Operator | Apr 2026 |