| 1 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 2 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Sep 2026 |
| 3 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 4 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 5 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Jun 2026 |
| 6 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 2026 |
| 7 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 8 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 9 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 10 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 11 | Data Energy Inc | Evergreen, CO 80439 | Oil & Gas Operator | Jul 2018 |
| 12 | Davimac Energy LLC | Stroud, OK 74079 | Oil & Gas Operator | Jun 2026 |
| 13 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 14 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 15 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 16 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 17 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 18 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | May 2026 |
| 19 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | May 2026 |
| 20 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 21 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 22 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | May 2026 |
| 23 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 24 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | May 2026 |
| 25 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 26 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | May 2026 |
| 27 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Sep 2026 |
| 28 | Discover Resources | Norman, OK 73070 | Oil & Gas Operator | Jan 2011 |
| 29 | Discover Resources LLC | Norman, OK 73072-2310 | Oil & Gas Operator | May 2026 |
| 30 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 31 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 32 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 33 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Sep 2026 |
| 34 | Double J Oil Co LLC | Bristow, OK 74010 | Oil & Gas Operator | Jun 2026 |
| 35 | Doug And Janene Risenhoover Oil And Gas LLC | Cushing, OK 74023 | Oil Operator | Jun 2026 |
| 36 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Jun 2026 |
| 37 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 38 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jun 2026 |
| 39 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 40 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | May 2026 |
| 41 | Dunlap Oil Company | Bristow, OK 74010 | Oil & Gas Operator | May 2026 |
| 42 | Dunlap Well Service Inc | Haskell, OK 74436 | Oil & Gas Operator | Sep 1993 |
| 43 | Dunn Energy LLC | Skiatook, OK 74070-4046 | Oil Operator | Sep 2022 |
| 44 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Jun 2026 |
| 45 | Duroc Exploration LLC | Bixby, OK 74008 | Oil & Gas Operator | May 2026 |
| 46 | Dyer Dale E Dba The Loving Company | Tulsa, OK 74107 | Oil & Gas Operator | Jun 2026 |
| 47 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |