| 1 | Dahab Energy Inc. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 2 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 3 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 4 | Dark Horse Operating Co., L.L.C. | Denton, TX 76202 | Oil & Gas Operator | Oct 2022 |
| 5 | Davis & Davis Machine Shop, Inc. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2025 |
| 6 | Davis & Salmon | Muenster, TX 76252 | Oil & Gas Operator | Oct 2017 |
| 7 | Davis, Don Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Oct 2025 |
| 8 | Davis, Kelly J. | Muenster, TX 76252 | Oil Operator | Oct 2025 |
| 9 | Davis, Odis Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Dec 2000 |
| 10 | Dawson, B G Oil & Gas LTD | Dallas, TX 75205 | Oil & Gas Operator | Jul 2024 |
| 11 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 12 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Oct 2025 |
| 13 | Delwintex Oil & Gas Prop., Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2003 |
| 14 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Oct 2025 |
| 15 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 16 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 17 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 18 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 19 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Oct 2025 |
| 20 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 21 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 22 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Oct 2025 |
| 23 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 24 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 25 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 26 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 27 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Oct 2025 |