| 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 | Feb 2026 |
| 5 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 6 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Nov 2025 |
| 7 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 8 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 9 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 10 | Dance Oil Co | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 11 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 12 | Darden Energy Corp | Hennessey, OK 73742 | Oil & Gas Operator | Jul 1999 |
| 13 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 14 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Nov 2025 |
| 15 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Dec 2025 |
| 16 | Dart Oil Properties | Enid, OK 73703 | Oil & Gas Operator | Oct 1992 |
| 17 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Nov 2025 |
| 18 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2025 |
| 19 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 20 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2025 |
| 21 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Feb 2026 |
| 22 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 23 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 24 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 25 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 26 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Dec 2025 |
| 27 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 28 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 2025 |
| 29 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 30 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 31 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Nov 2025 |
| 32 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 33 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 34 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 35 | Dewey Energy GP LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2022 |
| 36 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Nov 2025 |
| 37 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 38 | Diamond Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | May 1992 |
| 39 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 40 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Feb 2026 |
| 41 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 42 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 43 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 44 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 45 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 46 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 47 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 48 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 49 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 50 | Donaldson Richard E | Bartlesville, OK 74005-0032 | Oil & Gas Operator | Nov 2005 |
| 51 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 52 | Dorfs Drilling Company | Waurika, OK 73573 | Oil & Gas Operator | Nov 2024 |
| 53 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 54 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 55 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Dec 2025 |
| 56 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 57 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 58 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Dec 2025 |
| 59 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |