| 1 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 2 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Oct 2025 |
| 3 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 4 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 5 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 6 | D.N.I. | Bangs, TX 76823 | Oil & Gas Operator | Oct 2025 |
| 7 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 8 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 9 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 10 | David, Phillip | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 2025 |
| 11 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Oct 2025 |
| 12 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 13 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 14 | Dewco Exploration | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 15 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 16 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 17 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Oct 2025 |
| 18 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 19 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 20 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 21 | DMV Pipeline LLC | Lipan, TX 76462 | Oil & Gas Operator | Oct 2025 |
| 22 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 23 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 24 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 25 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Oct 2025 |
| 26 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Oct 2025 |
| 27 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2025 |
| 28 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 29 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Oct 2025 |
| 30 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 31 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |