| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Oct 2025 |
| 2 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 3 | Delhi-Taylor Oil Corp | Oil & Gas Operator | Dec 1974 | |
| 4 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 5 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 6 | Diamond Shamrock Expl | Dallas, TX 75201 | Oil & Gas Operator | May 1987 |
| 7 | Dougherty, H W | Petaluma, CA 94954 | Gas Operator | Oct 2019 |
| 8 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |