| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Daniel Oil Company | Oil & Gas Operator | Jan 1983 | |
| 2 | DBL DRLG.&Prod. Services, Inc. | Oil & Gas Operator | Jul 1997 | |
| 3 | Delta Energy Resources, Inc. | Oil & Gas Operator | Jun 1990 | |
| 4 | Dixon Management Corp. | Oil & Gas Operator | May 1984 | |
| 5 | Drew Cornell, Inc.-Agent | Oil & Gas Operator | Sep 1990 | |
| 6 | Dynamic Exploration, Inc. | Oil & Gas Operator | Oct 2003 |