| 1 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 2 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Oct 2025 |
| 3 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 4 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Oct 2025 |
| 5 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Jun 2025 |
| 6 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Jul 2025 |
| 7 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Jun 2025 |
| 8 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 9 | Davis Jim L | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 10 | Davis Kendall | Bethany, OK 73008-4714 | Oil Operator | Aug 2016 |
| 11 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 12 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 13 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Jul 2025 |
| 14 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 15 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 16 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Jun 2025 |
| 17 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Jun 2025 |
| 18 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 19 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Oct 2025 |
| 20 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 21 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jun 2025 |
| 22 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 23 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 24 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | May 2025 |
| 25 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 26 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 27 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Jun 2025 |
| 28 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 29 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 30 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 31 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Jun 2025 |
| 32 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 33 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 34 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 35 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Jul 2025 |
| 36 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 37 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jun 2025 |
| 38 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 39 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 40 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 41 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 42 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 43 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |
| 44 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |