| 101 | Daniels, Earlene | Follett, TX 79034 | Oil & Gas Operator | Feb 2002 |
| 102 | Daniels, J.C. Energy | Pampa, TX 79066 | Oil & Gas Operator | Apr 2001 |
| 103 | Danmark Energy Services, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Apr 2021 |
| 104 | Dantex Oil & Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 105 | Dao Oil And Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2025 |
| 106 | Dara Operating Company, LLC | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 107 | Darco Operators | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 108 | Dark Canyon Resources LLC | Refugio, TX 78377 | Oil Operator | Dec 2025 |
| 109 | Dark Horse Operating Co., L.L.C. | Denton, TX 76202 | Oil & Gas Operator | Oct 2022 |
| 110 | Dark Horse Producing Of TX, L.P. | Alice, TX 78333 | Oil & Gas Operator | Dec 2025 |
| 111 | Darkens Oil & Gas Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 112 | Darley Enterprises, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Jan 2012 |
| 113 | Darr-Hey Oil, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2025 |
| 114 | Darrah Oil Company, LLC | Wichita, KS 67201 | Oil & Gas Operator | Dec 2025 |
| 115 | Darst Creek Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Mar 2021 |
| 116 | Dart Oil & Gas Corporation | Mason, MI 48854 | Oil & Gas Operator | Jun 2018 |
| 117 | Dartex Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 118 | Dartex Energy Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 119 | Das Oil Co. L.L.C. | Post, TX 79356 | Oil Operator | Dec 2025 |
| 120 | Dasbek Energy, L.L.C. | Sugar Land, TX 77479 | Oil & Gas Operator | Dec 2025 |
| 121 | Dash Production Company, Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Dec 2025 |
| 122 | Daubert Operating, L.L.C. | San Antonio, TX 78209 | Oil Operator | Dec 2025 |
| 123 | Davco Oil LLC | Fort Worth, TX 76108 | Oil & Gas Operator | Dec 2025 |
| 124 | Davcro Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2003 |
| 125 | Davenport Oil Company | Luling, TX 78648 | Oil & Gas Operator | Dec 1996 |
| 126 | Davenport, Vernon | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 127 | Davenport, Vernon Prod. Co. | Dumas, TX 79029 | Oil & Gas Operator | Jan 2002 |
| 128 | David, Phillip | Lawrenceville, IL 62439 | Oil & Gas Operator | Dec 2025 |
| 129 | Davidson Production Company, LLC | Bertram, TX 78605 | Oil Operator | Dec 2025 |
| 130 | Davidson, Dan | Ozona, TX 76943 | Oil & Gas Operator | Dec 2025 |
| 131 | Davidson, Grover R. | Bertram, TX 78605 | Oil & Gas Operator | Dec 2025 |
| 132 | Davis & Carr Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Jun 1994 |
| 133 | Davis & Davis Machine Shop, Inc. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2025 |
| 134 | Davis & Salmon | Muenster, TX 76252 | Oil & Gas Operator | Oct 2017 |
| 135 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 136 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 137 | Davis Energy Services LLC | La Grange, TX 78945 | Oil Operator | Dec 2025 |
| 138 | Davis Enterprises | Abilene, TX 79608 | Oil & Gas Operator | Aug 1998 |
| 139 | Davis Gulf Coast, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 140 | Davis Oil & Gas, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2011 |
| 141 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Dec 2025 |
| 142 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 143 | Davis Preservation Oil Trust | Denver, CO 80206 | Gas Operator | Mar 1998 |
| 144 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | Dec 2025 |
| 145 | Davis, A. L. Production Co.,Inc. | Van Vleck, TX 77482 | Oil & Gas Operator | Aug 2003 |
| 146 | Davis, C. O. Production Co. | Bay City, TX 77414 | Oil & Gas Operator | Dec 2025 |
| 147 | Davis, D. D. Estate Of | Borger, TX 79008 | Oil & Gas Operator | Jul 1998 |
| 148 | Davis, Don Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 149 | Davis, Gowin | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2001 |
| 150 | Davis, J. R. Oil Company | Sweeny, TX 77480 | Oil & Gas Operator | Dec 2025 |
| 151 | Davis, Joe D. | Fort Smith, AR 72903 | Gas Operator | Mar 2015 |
| 152 | Davis, Kelly J. | Muenster, TX 76252 | Oil Operator | Dec 2025 |
| 153 | Davis, Larry D. | Boling, TX 77420 | Oil & Gas Operator | Dec 2025 |
| 154 | Davis, Odis Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Dec 2000 |
| 155 | Davis, Paul Pipe & Supply Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2001 |
| 156 | Davis, R. E. Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2015 |
| 157 | Davis, Randy | Perryton, TX 79070 | Oil & Gas Operator | Jun 2017 |
| 158 | Davis, Robert E. | Graham, TX 76450 | Oil & Gas Operator | Apr 1997 |
| 159 | Davis, Roland C. | Hardin, TX 77561 | Oil & Gas Operator | May 1997 |
| 160 | Davis, Sammy | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 161 | Davis, Tommy | Hebbronville, TX 78361 | Oil & Gas Operator | Jun 1995 |
| 162 | Davis, Travis H. | Spearman, TX 79081 | Oil & Gas Operator | Jul 2003 |
| 163 | Davis, Travis H. Gas | Spearman, TX 79081 | Oil & Gas Operator | Dec 2025 |
| 164 | Davis, William H. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 165 | Dawkins Energies, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 166 | Dawn Oil & Gas Operators Inc. | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 167 | Dawsey Operating Company | Georgetown, TX 78628 | Oil & Gas Operator | Mar 2016 |
| 168 | Dawson Geophysical Company | Midland, TX 79701 | Oil Operator | Aug 2024 |
| 169 | Dawson Operating Company | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 170 | Dawson, B G Oil & Gas LTD | Dallas, TX 75205 | Oil & Gas Operator | Jul 2024 |
| 171 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2025 |
| 172 | Day Resources, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 1994 |
| 173 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 174 | Daystar Operating Company, LLC | Austin, TX 78750 | Oil & Gas Operator | Apr 2008 |
| 175 | DB Resources, LLC | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 176 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Dec 2025 |
| 177 | Dbo Oil Incorporated | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2025 |
| 178 | DBP Exploration, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 179 | DCDC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2003 |
| 180 | DCP Midstream, LP | Denver, CO 80237 | Oil Operator | Nov 2006 |
| 181 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Aug 2025 |
| 182 | DCS Energy | Throckmorton, TX 76483 | Oil Operator | Dec 2025 |
| 183 | DDC Energy Corporation | Marietta, GA 30068 | Oil & Gas Operator | Mar 1997 |
| 184 | DDC Production Company | Archer City, TX 76351 | Oil Operator | Dec 2025 |
| 185 | DDC Track, LLC | Bushland, TX 79012 | Oil Operator | Dec 2025 |
| 186 | DDD Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 187 | De Central Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 188 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 189 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 190 | De La Torre Oil & Gas, Inc | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 191 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 192 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 193 | De V Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 194 | De-Vac Inc. | Daisetta, TX 77533 | Oil Operator | Dec 2025 |
| 195 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 196 | Deagen, Bill & Sons, LTD. | Stockdale, TX 78160 | Oil Operator | May 2018 |
| 197 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 198 | Deanlake Operator, L.L.C. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 199 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 200 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |