| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 2 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 3 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 4 | Donald C Slawson Expl Co. Inc | Oil & Gas Operator | Dec 2020 | |
| 5 | Dos Rios Inc. | Gas Operator | Jul 2025 | |
| 6 | Drilling Exploration & Operating Co. Inc. | Oil & Gas Operator | Aug 2025 | |
| 7 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |