| 1 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 2 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 3 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Jun 2025 |
| 4 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 5 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 6 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 7 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 8 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Mar 2025 |
| 9 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Feb 2025 |
| 10 | Dash Operating LLC | Oklahoma City, OK 73118-5031 | Oil & Gas Operator | Feb 2025 |
| 11 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Apr 2025 |
| 12 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 13 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Feb 2025 |
| 14 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Feb 2025 |
| 15 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 16 | Davis, William H. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 17 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 18 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 19 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 20 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 21 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 22 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 23 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 24 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 25 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Mar 2025 |
| 26 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 27 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 28 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 29 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jun 2025 |
| 30 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 31 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 32 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 33 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Jan 2025 |
| 34 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 35 | Dryes Corner LLC | Crescent, OK 73028 | Oil Operator | Mar 2025 |
| 36 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 37 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Mar 2025 |
| 38 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |