| 1 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 2 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 3 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 4 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 5 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 6 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 7 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 8 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 9 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Jul 2025 |
| 10 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Jul 2025 |
| 11 | Dauco Petroleum Corporation | Rowlett, TX 75089-3066 | Oil & Gas Operator | Jan 2021 |
| 12 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Jul 2025 |
| 13 | Davidson Gene | Perry, OK 73077-0144 | Oil & Gas Operator | Aug 2014 |
| 14 | Davies & Company | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2000 |
| 15 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Oct 2025 |
| 16 | Davis, William H. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 17 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |
| 18 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 19 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 20 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 21 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 22 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 23 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 24 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 25 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 26 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 27 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Jun 2025 |
| 28 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 29 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 30 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 31 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Jun 2025 |
| 32 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 33 | Dorado Energy LLC | Edmond, OK 73012 | Oil & Gas Operator | Jan 2021 |
| 34 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | May 2025 |
| 35 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Jun 2025 |
| 36 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 37 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 38 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |