| 1 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 2 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Jul 2025 |
| 3 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Jul 2025 |
| 4 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 5 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 6 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 7 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 8 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 9 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jun 2025 |
| 10 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 11 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | May 2025 |
| 12 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Oct 2025 |
| 13 | Double J Oil Co LLC | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 14 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 15 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jun 2025 |
| 16 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Jul 2025 |
| 17 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 18 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 19 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Jul 2025 |
| 20 | Duroc Exploration LLC | Bixby, OK 74008 | Oil Operator | Jun 2025 |