| 1 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 2 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 3 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 4 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Oct 2025 |
| 5 | D.T. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 6 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 7 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 8 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Oct 2025 |
| 9 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 10 | Dbo Oil Incorporated | Georgetown, TX 78628 | 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 | Deltex Minerals Inc. | Peachtree Cty, GA 30269 | Oil & Gas Operator | Oct 2025 |
| 14 | Dennis & Broun | Bullard, TX 75757 | Oil & Gas Operator | Sep 2003 |
| 15 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 16 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 17 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 18 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 19 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 20 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 21 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Oct 2025 |
| 22 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 23 | Drennan Oil L.L.C. | Ballinger, TX 76821 | Oil & Gas Operator | Oct 2025 |
| 24 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 25 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 26 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Oct 2025 |
| 27 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 28 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 29 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |