| 1 | D & B Operating LLC | | Oil Operator | Jan 2023 |
| 2 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 3 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 4 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 5 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 6 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Apr 2024 |
| 7 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2024 |
| 8 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 9 | Darrell'S Drilling Inc | Konawa, OK 74849-0068 | Oil Operator | Jan 2024 |
| 10 | Darriel C Ray | | Oil Operator | Jun 2020 |
| 11 | Dash Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 12 | David Ridley Oil LLC | Tecumseh, OK 74873-7906 | Oil Operator | Jan 2024 |
| 13 | Davis & Hamilton Oil Company | Edmond, OK 73083-3670 | Oil Operator | Aug 2022 |
| 14 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 15 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 16 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2024 |
| 17 | Dead Fern Resources Inc | | Oil & Gas Operator | Jan 2024 |
| 18 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 19 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 20 | Dee-Jay Exploration Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2024 |
| 21 | Delphi Oil And Gas LLC | | Oil Operator | Dec 2023 |
| 22 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 23 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 24 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 25 | Dewey Enterprises Inc | | Oil & Gas Operator | Jan 2024 |
| 26 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 27 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2024 |
| 28 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 29 | Doco Development Corporation | Norman, OK 73070-4324 | Oil & Gas Operator | Jan 2024 |
| 30 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 31 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Nov 2023 |
| 32 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849-0127 | Oil & Gas Operator | Dec 2023 |
| 33 | Duncan Oil & Gas Inc | Norman, OK 73070-8155 | Oil & Gas Operator | Sep 2020 |
| 34 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 35 | Dyno Energy LLC | Oklahoma City, OK 73154-0964 | Oil & Gas Operator | Jan 2024 |