| 1 | D & C Operating, Inc. | | Oil & Gas Operator | Apr 1999 |
| 2 | D & D DRLG Co & Saye Oil Co | | Oil Operator | Apr 1982 |
| 3 | D & D Expl Co-Mba Energy | | Oil Operator | Nov 1985 |
| 4 | D & D Exploration Co. | | Oil & Gas Operator | Nov 1986 |
| 5 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Feb 2026 |
| 6 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 7 | D & J Producing Company | | Oil Operator | Sep 2006 |
| 8 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 9 | D & T Company | | Oil & Gas Operator | Jun 1983 |
| 10 | D & V Petroleum Corporation | | Oil & Gas Operator | May 1992 |
| 11 | D & W Oil & Gas Co. | | Gas Operator | Jan 1990 |
| 12 | D C Bintliff & W W F Oil Corp. | | Oil & Gas Operator | Dec 1989 |
| 13 | D H & L Operating, Inc. | | Oil & Gas Operator | Sep 1983 |
| 14 | D J Production | Pasadena, TX 77502 | Oil & Gas Operator | Mar 2025 |
| 15 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 16 | D-Mop Investments, L.L.C. | | Gas Operator | Jan 2024 |
| 17 | D-O-R Lease Service, Inc. | | Oil & Gas Operator | Mar 2009 |
| 18 | D-Ram Construction Co., Inc. | | Gas Operator | Dec 1990 |
| 19 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 20 | D-Tec Well Production LLC | | Oil Operator | Dec 2024 |
| 21 | D. A. Biglane | | Oil & Gas Operator | Feb 1990 |
| 22 | D. A. Milton | | Oil & Gas Operator | Dec 2016 |
| 23 | D. B. Braddock | | Oil & Gas Operator | Jan 1986 |
| 24 | D. B. Braddock-Kisatchie Res. | | Oil & Gas Operator | Jan 1985 |
| 25 | D. B. McClinton | | Oil & Gas Operator | Jun 1992 |
| 26 | D. B. McConnell | | Oil & Gas Operator | Oct 1991 |
| 27 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 28 | D. C. Bintliff | | Oil & Gas Operator | Mar 1987 |
| 29 | D. C. Bintliff Et Al | | Oil & Gas Operator | Feb 1987 |
| 30 | D. C. Bintliff-McCormick O&G | | Oil & Gas Operator | Oct 1983 |
| 31 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Feb 2026 |
| 32 | D. I. Dupree | | Oil & Gas Operator | Sep 2015 |
| 33 | D. J. Fritz | | Oil & Gas Operator | Feb 1982 |
| 34 | D. J. Simmons & Co. Of La. | | Gas Operator | Nov 1996 |
| 35 | D. L. & Barbara W. Chiles | | Oil Operator | Jan 2025 |
| 36 | D. L. Gish | | Oil Operator | Mar 1992 |
| 37 | D. L. Gish Oil Partnership | | Oil Operator | Feb 1989 |
| 38 | D. L. Gish Oil, Inc. | | Oil Operator | Jul 1998 |
| 39 | D. L. Gish, Inc. | | Oil Operator | Jun 1990 |
| 40 | D. L. Trainer | | Oil Operator | Mar 1991 |
| 41 | D. S. Owens | | Oil & Gas Operator | Dec 1991 |
| 42 | D. W. Chumley, Jr. | | Oil & Gas Operator | Dec 2024 |
| 43 | D. W. Tanner | | Oil & Gas Operator | May 2000 |
| 44 | D.C.Bintliff-McCormick Oper Co | | Oil & Gas Operator | May 1984 |
| 45 | D.J.F. Petroleum Corporation | | Oil & Gas Operator | Oct 1992 |
| 46 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 47 | Dac Oil Corporation | | Oil & Gas Operator | Dec 1985 |
| 48 | Dailey Oil And Gas LLC | | Oil & Gas Operator | Jun 2019 |
| 49 | Dal-Long Oil Company | Longview, TX 75608 | Oil Operator | Feb 2001 |
| 50 | Dalco Petroleum Inc | | Oil & Gas Operator | Jan 2006 |
| 51 | Dale Expl Co & R. A. Campbell | | Oil Operator | Nov 1995 |
| 52 | Dale Exploration Co. | | Oil & Gas Operator | May 2004 |
| 53 | Dale O. Reese | | Oil Operator | Nov 1989 |
| 54 | Dale O. Reese, Inc. | | Oil Operator | Jul 1997 |
| 55 | Dale Operating Company | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 56 | Daleco Resources | | Gas Operator | Dec 2000 |
| 57 | Dalen Resources Oil & Gas Co | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 58 | Dallas DRLG. & Development Co. | | Oil & Gas Operator | Apr 1987 |
| 59 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 60 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 61 | Dalnor Corporation | | Oil & Gas Operator | Nov 2010 |
| 62 | Dalton J. Woods | | Oil & Gas Operator | Dec 1985 |
| 63 | Damian Oil, Inc. | | Oil & Gas Operator | Dec 2024 |
| 64 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 65 | Damson-Franks-McCord-Goodrich | | Oil & Gas Operator | Aug 1984 |
| 66 | Dan A. Hughes Company | | Oil & Gas Operator | Dec 2005 |
| 67 | Dan A. Hughes Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Dec 2025 |
| 68 | Dan Owens | | Oil & Gas Operator | Jul 1993 |
| 69 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 70 | Danny Glass | | Oil Operator | Jan 1987 |
| 71 | Danos Oil & Gas LLC | | Oil & Gas Operator | Oct 2024 |
| 72 | Dant Operating Company Inc. | | Oil & Gas Operator | Jan 1989 |
| 73 | Dantex Oil & Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 74 | Dardan Expl Inc-H Edison Ellis | | Oil & Gas Operator | Apr 1990 |
| 75 | Darsey Operating Corporation | | Oil & Gas Operator | Sep 1990 |
| 76 | Dave Easom Production Co. Inc. | | Oil & Gas Operator | May 2000 |
| 77 | Dave'S Production | | Oil Operator | Dec 2024 |
| 78 | Davenport Production Corp. | | Oil Operator | Sep 1988 |
| 79 | David A. Robinson | | Oil Operator | Jan 1999 |
| 80 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 81 | David Crow Trustee Et Al | | Oil & Gas Operator | Jan 1986 |
| 82 | David Divine Production | | Oil & Gas Operator | Nov 1997 |
| 83 | David L. Whittington | | Gas Operator | Dec 1998 |
| 84 | David L. Whittington Inc | | Gas Operator | Sep 2022 |
| 85 | David Lynn Chiles | | Oil & Gas Operator | Aug 2020 |
| 86 | David New Operating Co. Inc. | | Oil & Gas Operator | Feb 1999 |
| 87 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 88 | Davis & Kaiser Operating, Inc. | | Oil Operator | May 2004 |
| 89 | Davis And Backus | | Oil Operator | Nov 1999 |
| 90 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 91 | Davis Gulf Coast, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 92 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 93 | Davis Oil Company-Cox | | Oil & Gas Operator | Aug 1980 |
| 94 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 95 | Davis-Goodman Oil Company | | Oil & Gas Operator | Jun 1980 |
| 96 | Davis-Goodman-Medders | | Oil & Gas Operator | Jun 1980 |
| 97 | Dawson Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 98 | Day Dreams Resources, LLC | | Oil & Gas Operator | Dec 2025 |
| 99 | Day Town Operating, LLC | | Oil & Gas Operator | Jan 2025 |
| 100 | Daybreak Oil And Gas, Inc. | | Oil & Gas Operator | Dec 2025 |