| 1 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 2 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 3 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Feb 2025 |
| 4 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2025 |
| 5 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 6 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 7 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 8 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 9 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 10 | David Ridley Oil LLC | Tecumseh, OK 74873-7906 | Oil Operator | Jan 2025 |
| 11 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 12 | Davis Jared | Wann, OK 74083-9610 | Oil & Gas Operator | Jan 2025 |
| 13 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2025 |
| 14 | DC Operating LLC | Yale, OK 74085-6662 | Oil & Gas Operator | Mar 2020 |
| 15 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 16 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 17 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 18 | Delong Oil & Gas Serv Inc | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 19 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 20 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 21 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 22 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2025 |
| 23 | Deshazo Production Company | Dewey, OK 74029-2811 | Oil & Gas Operator | Nov 2005 |
| 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 | Apr 2025 |
| 26 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jan 2025 |
| 27 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Feb 2025 |
| 28 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 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 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 32 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2025 |
| 33 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 34 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Feb 2025 |
| 35 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 36 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 37 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Feb 2025 |
| 38 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 39 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 40 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Feb 2025 |