| 1 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 2 | D-Tec Well Production LLC | | Oil Operator | Dec 2024 |
| 3 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 4 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Oct 2025 |
| 5 | D. L. & Barbara W. Chiles | | Oil Operator | Jan 2025 |
| 6 | D. L. Gish Oil Partnership | | Oil Operator | Feb 1989 |
| 7 | D. L. Trainer | | Oil Operator | Mar 1991 |
| 8 | D. S. Owens | | Oil & Gas Operator | Dec 1991 |
| 9 | D. W. Chumley, Jr. | | Oil & Gas Operator | Dec 2024 |
| 10 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 11 | Dalnor Corporation | | Oil & Gas Operator | Nov 2010 |
| 12 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 13 | Dan Owens | | Oil & Gas Operator | Jul 1993 |
| 14 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 15 | Danny Glass | | Oil Operator | Jan 1987 |
| 16 | Dave'S Production | | Oil Operator | Dec 2024 |
| 17 | Davenport Production Corp. | | Oil Operator | Sep 1988 |
| 18 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 19 | David Divine Production | | Oil & Gas Operator | Nov 1997 |
| 20 | David Lynn Chiles | | Oil & Gas Operator | Aug 2020 |
| 21 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 22 | Davis And Backus | | Oil Operator | Nov 1999 |
| 23 | Daymon Martin | | Oil Operator | Mar 1983 |
| 24 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 25 | Debeaux - Flores | | Oil & Gas Operator | Jan 2025 |
| 26 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 27 | Dekasco, Inc. | | Oil & Gas Operator | May 1990 |
| 28 | Delbert A. Dodson | | Oil Operator | Aug 2002 |
| 29 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 30 | Dempsey & Rowe | | Oil Operator | Aug 1986 |
| 31 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 32 | Despot Production Company | | Oil & Gas Operator | May 1983 |
| 33 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 34 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 35 | DGH Petroleum, Inc. | | Oil & Gas Operator | Aug 2011 |
| 36 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 37 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 38 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Oct 2025 |
| 39 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 40 | Don Townes | | Oil Operator | Sep 2000 |
| 41 | Don W. Holcomb | | Oil Operator | Feb 1996 |
| 42 | Donald Owens | | Oil & Gas Operator | Dec 2024 |
| 43 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 44 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 45 | Dow Mineral & Royalty Co, Inc | | Oil & Gas Operator | Jun 1994 |
| 46 | Doyle Dempsey | | Oil Operator | May 1997 |
| 47 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 48 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 49 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 50 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 51 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 52 | Dvi | | Oil Operator | Dec 2008 |
| 53 | Dykes Oil Co. | | Oil Operator | Dec 2001 |
| 54 | Dzurik Interests, Inc. | | Oil & Gas Operator | Dec 2024 |