| 101 | D K Oil Services LLC | Wellsville, KS 66092 | Oil Operator | Nov 2019 |
| 102 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 103 | D M Norman | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 104 | D N C Enterprises Inc | Farmington, NM 87402 | Oil & Gas Operator | Feb 2005 |
| 105 | D N Stover Inc | Knox, PA 16232-0810 | Oil & Gas Operator | Dec 2015 |
| 106 | D O Walker Inc | Stratford, OK 74872 | Oil Operator | Sep 2025 |
| 107 | D Oil, Inc. | Victoria, KS 67671 | Oil Operator | Sep 2025 |
| 108 | D S & W Well Ser | | Oil Operator | Nov 1996 |
| 109 | D S & W Well Servicing, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 110 | D T E Gas And Oil Co | | Gas Operator | May 2007 |
| 111 | D T E Gas Company | | Oil & Gas Operator | Jun 1999 |
| 112 | D U Investments | Salina, KS 67401 | Oil & Gas Operator | Dec 2009 |
| 113 | D W Energy, LLC | Dunbar, WV 25064 | Oil & Gas Operator | Dec 2021 |
| 114 | D&D Energy Company | N.Canton, OH 44721 | Oil & Gas Operator | Dec 2020 |
| 115 | D&H-S-S Production Co.,Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Aug 2003 |
| 116 | D&M Operating, L.L.C. | Corpus Chrsti, TX 78414 | Gas Operator | Dec 2025 |
| 117 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 118 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 119 | D'Amato, Giovanni C. | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 120 | D-B-K Operating Company | | Oil Operator | Jan 2006 |
| 121 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 122 | D-D Oil | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2018 |
| 123 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Dec 2025 |
| 124 | D-Mop Investments, L.L.C. | | Gas Operator | Jan 2024 |
| 125 | D-O-R Lease Service, Inc. | | Oil & Gas Operator | Mar 2009 |
| 126 | D-Oil Incorporat | | Oil Operator | Aug 1990 |
| 127 | D-Pex Operating Company | | Oil & Gas Operator | Sep 2004 |
| 128 | D-Ram Construction Co., Inc. | | Gas Operator | Dec 1990 |
| 129 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 130 | D-S-B Properties, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 131 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 132 | D-Tec Well Production LLC | | Oil Operator | Dec 2024 |
| 133 | D. A. Biglane Operating Co Et Al | | Oil Operator | Feb 2004 |
| 134 | D. & D. Operating Account | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2009 |
| 135 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 136 | D. A. Biglane | | Oil & Gas Operator | Feb 1990 |
| 137 | D. A. Milton | | Oil & Gas Operator | Dec 2016 |
| 138 | D. A. Stark | | Oil Operator | Dec 1990 |
| 139 | D. B. Braddock | | Oil & Gas Operator | Jan 1986 |
| 140 | D. B. Braddock-Kisatchie Res. | | Oil & Gas Operator | Jan 1985 |
| 141 | D. B. McClinton | | Oil & Gas Operator | Jun 1992 |
| 142 | D. B. McConnell | | Oil & Gas Operator | Oct 1991 |
| 143 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 144 | D. C. Bintliff | | Oil & Gas Operator | Mar 1987 |
| 145 | D. C. Bintliff Et Al | | Oil & Gas Operator | Feb 1987 |
| 146 | D. C. Bintliff-McCormick O&G | | Oil & Gas Operator | Oct 1983 |
| 147 | D. C. Malcolm, Inc. | Charleston, WV 25301 | Oil & Gas Operator | Dec 2021 |
| 148 | D. E. Craggs Inc. | | Gas Operator | Dec 1993 |
| 149 | D. E. Exploration, Inc. | Wellsville, KS 66092 | Oil & Gas Operator | Sep 2025 |
| 150 | D. G. Haney, Inc. | Charleston, WV 25338-3810 | Oil & Gas Operator | Dec 2021 |
| 151 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Dec 2025 |
| 152 | D. I. Dupree | | Oil & Gas Operator | Sep 2015 |
| 153 | D. J. Fritz | | Oil & Gas Operator | Feb 1982 |
| 154 | D. J. Hatfield | | Oil & Gas Operator | Dec 1994 |
| 155 | D. J. Pickrell Operator | | Gas Operator | Dec 2012 |
| 156 | D. J. Simmons & Co. Of La. | | Gas Operator | Nov 1996 |
| 157 | D. Jackson Rentals LLC | Easton, KS 66020 | Oil Operator | Sep 2025 |
| 158 | D. K. Boyd Oil & Gas Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 1999 |
| 159 | D. L. & Barbara W. Chiles | | Oil Operator | Jan 2025 |
| 160 | D. L. Gish | | Oil Operator | Mar 1992 |
| 161 | D. L. Gish Oil Partnership | | Oil Operator | Feb 1989 |
| 162 | D. L. Gish Oil, Inc. | | Oil Operator | Jul 1998 |
| 163 | D. L. Gish, Inc. | | Oil Operator | Jun 1990 |
| 164 | D. L. Trainer | | Oil Operator | Mar 1991 |
| 165 | D. O. G. Operating, LLC | Port Aransas, TX 78373 | Oil & Gas Operator | Dec 2025 |
| 166 | D. R. Lauck Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jul 2019 |
| 167 | D. S. Owens | | Oil & Gas Operator | Dec 1991 |
| 168 | D. Shel Oil, Inc. | Gonzales, TX 78629 | Oil Operator | Dec 2025 |
| 169 | D. W. Chumley, Jr. | | Oil & Gas Operator | Dec 2024 |
| 170 | D. W. Elliott Operating Acct | | Oil & Gas Operator | Dec 1991 |
| 171 | D. W. Tanner | | Oil & Gas Operator | May 2000 |
| 172 | D.C. Oil | Natalia, TX 78059 | Oil Operator | Dec 2025 |
| 173 | D.C.Bintliff-McCormick Oper Co | | Oil & Gas Operator | May 1984 |
| 174 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 175 | D.J.F. Petroleum Corporation | | Oil & Gas Operator | Oct 1992 |
| 176 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2025 |
| 177 | D.K. Rush Oil Co., LLC | El Dorado, KS 67042 | Oil Operator | Sep 2025 |
| 178 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Dec 2025 |
| 179 | D.M. Well Service | | Oil Operator | Dec 2019 |
| 180 | D.N.I. | Bangs, TX 76823 | Oil & Gas Operator | Dec 2025 |
| 181 | D.O.E. Energy | Palestine, TX 75801 | Oil & Gas Operator | Dec 2025 |
| 182 | D.T. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 183 | D.W.P. Production | Perryton, TX 79070 | Oil & Gas Operator | Nov 2020 |
| 184 | D.W.R. Oil Properties, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Dec 2025 |
| 185 | D.W.S. Properties | Sterling, KS 67579 | Oil Operator | Mar 2006 |
| 186 | D.Y. Exploration, Inc. | Boise, ID 83705 | Oil & Gas Operator | Dec 2025 |
| 187 | D10 Energy LLC | Stinnett, TX 79083 | Oil & Gas Operator | Dec 2025 |
| 188 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 189 | Da Co Petroleum, Inc. | Wann, OK 74083 | Gas Operator | Apr 2003 |
| 190 | Da Company Petro | | Gas Operator | Jun 1995 |
| 191 | Da Crowe & Associates, Inc | Chappell Hill, TX 77426 | Oil & Gas Operator | Sep 2010 |
| 192 | Da Energy, LLC | Lees Summit, MO 64063 | Oil Operator | Sep 2025 |
| 193 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 194 | Dab Limited | Oklahoma City, OK 73116-9082 | Oil & Gas Operator | Aug 2013 |
| 195 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 196 | Dac Oil Corporation | | Oil & Gas Operator | Dec 1985 |
| 197 | Dacar Energy, Inc | | Oil Operator | Dec 2015 |
| 198 | Daco Oil | Joinerville, TX 75658 | Oil & Gas Operator | Aug 2019 |
| 199 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Dec 2025 |
| 200 | Dacott Oil & Gas, LLC | Pampa, TX 79065 | Oil & Gas Operator | Sep 2011 |