| 3101 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 3102 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 3103 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Sep 2026 |
| 3104 | Don-Dale, Inc. | Clarksville, TX 75426 | Oil & Gas Operator | Aug 2003 |
| 3105 | Donna-Lynne Oil Co. | George West, TX 78022 | Oil & Gas Operator | Jun 2018 |
| 3106 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 3107 | Donnell, Bill | Graham, TX 76450 | Oil & Gas Operator | May 1995 |
| 3108 | Donnell, Louis, Jr. | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 3109 | Donoco Oil Company | La Vernia, TX 78121 | Oil & Gas Operator | Sep 2026 |
| 3110 | Doolaree Corporation | Sherman, TX 75091 | Oil & Gas Operator | Sep 2026 |
| 3111 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 3112 | Dora Inc | Levelland, TX 79336 | Oil & Gas Operator | Jul 2019 |
| 3113 | Dorado Drilling, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 3114 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 3115 | Dorado Operating Inc. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2011 |
| 3116 | Dorchester Operating Company LLC | Refugio, TX 78377 | Oil & Gas Operator | Sep 2026 |
| 3117 | Dorchester Resources LP | Oklahoma City, OK 73154-8879 | Oil & Gas Operator | Aug 2021 |
| 3118 | Dore Corporation | Amarillo, TX 79119 | Gas Operator | Jun 2010 |
| 3119 | Dore Energy Co., LTD. | Amarillo, TX 79101 | Gas Operator | Sep 2026 |
| 3120 | Dorfman Production Company | Beloit, OH 44609 | Oil & Gas Operator | Sep 2026 |
| 3121 | Dorland, D. L. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 3122 | Dorland, D. L. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 3123 | Dorland, D. L. Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 3124 | Dorondoco Operating Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 1994 |
| 3125 | Dorough, Lee Operations | Orlando, FL 32801 | Oil & Gas Operator | Sep 2026 |
| 3126 | Dorr, John R. | Pecos, TX 79772 | Oil & Gas Operator | Sep 2026 |
| 3127 | Dos Cicadas | Miles, TX 76861 | Oil & Gas Operator | Sep 2026 |
| 3128 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | Sep 2026 |
| 3129 | Double Barrel Operating Limited Liability Company | Wichita Falls, TX 76308 | Oil Operator | Sep 2026 |
| 3130 | Double C Operating LLC | Abilene, TX 79602 | Oil Operator | Sep 2026 |
| 3131 | Double C Production, LLC | Canyon Lake, TX 78133 | Oil Operator | Sep 2026 |
| 3132 | Double Diamond Energy Corp. | Granbury, TX 76048 | Gas Operator | Apr 2013 |
| 3133 | Double Diamond Petroleum, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 3134 | Double E Oil & Gas, L. P. | Electra, TX 76360 | Oil & Gas Operator | Sep 2026 |
| 3135 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Apr 2026 |
| 3136 | Double Eagle Oil Co. | Marshall, TX 75670 | Oil & Gas Operator | Jan 2002 |
| 3137 | Double Eagle Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 3138 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Sep 2026 |
| 3139 | Double Eight Oil Company LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2026 |
| 3140 | Double J Enterprises | Loving, TX 76460 | Oil Operator | Sep 2026 |
| 3141 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 3142 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 3143 | Double L Contractors, LLC | Carthage, TX 75633 | Oil Operator | Sep 2026 |
| 3144 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 3145 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Sep 2026 |
| 3146 | Double Play Oil & Gas | Portland, TX 78374 | Oil & Gas Operator | Dec 2001 |
| 3147 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Sep 2026 |
| 3148 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 3149 | Double S Liberty Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 3150 | Double S Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 3151 | Double T Energy LLC | Lenorah, TX 79749 | Oil Operator | Sep 2026 |
| 3152 | Double U Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1996 |
| 3153 | Double U Oil Co., LTD. | San Antonio, TX 78217 | Oil & Gas Operator | May 2000 |
| 3154 | Dougherty Properties | Beeville, TX 78104 | Oil & Gas Operator | Jun 1997 |
| 3155 | Doughtie Operating Company, LLC | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2023 |
| 3156 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 3157 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 3158 | Douglas, Norvel Trust | Hot Springs V, AR 71909 | Oil & Gas Operator | Aug 2013 |
| 3159 | Dove Creek Energy, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | Sep 2026 |
| 3160 | Dove Creek Resources, LLC | Arlington, TX 76012 | Oil Operator | Sep 2026 |
| 3161 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 3162 | Dove Mineral | Abilene, TX 79601 | Oil & Gas Operator | Dec 2010 |
| 3163 | Dowden, T. L. | Henderson, TX 75652 | Oil & Gas Operator | Sep 2026 |
| 3164 | Dowell Oil & Gas | Stephenville, TX 76401 | Oil & Gas Operator | Sep 2026 |
| 3165 | Down-Hole Pump Service Co., Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2026 |
| 3166 | Downing Well Service, Inc. | Devine, TX 78016 | Oil & Gas Operator | Sep 2026 |
| 3167 | Downman Jones Oil Operators, Inc | Brookshire, TX 77423 | Oil & Gas Operator | Jan 2007 |
| 3168 | DP Permian Operator, LLC | Houston, TX 77024 | Oil & Gas Operator | Aug 2024 |
| 3169 | DP Well Works I, LLC | Salt Lake Cty, UT 84103 | Oil & Gas Operator | Sep 2026 |
| 3170 | DPMP Energy LLC | Prosper, TX 75078 | Oil & Gas Operator | Dec 2023 |
| 3171 | Drachen Energy Co. | San Antonio, TX 78258 | Oil Operator | Sep 2026 |
| 3172 | Drachen Oil Company | San Antonio, TX 78258 | Oil & Gas Operator | Sep 2026 |
| 3173 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 3174 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 3175 | Dragon Operating, LLC | Tulsa, OK 74137 | Oil Operator | Sep 2026 |
| 3176 | Dragoon Oil & Gas Co. | Fort Worth, TX 76147 | Oil & Gas Operator | May 2015 |
| 3177 | Drain Oil Co. | Fritch, TX 79036 | Oil & Gas Operator | Jul 2009 |
| 3178 | Drain Oil Co. LLC | Fritch, TX 79036 | Oil & Gas Operator | Sep 2026 |
| 3179 | Drake Oil & Gas, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2026 |
| 3180 | Drake Petroleum, LLC | Cypress, TX 77429 | Oil & Gas Operator | Jun 2023 |
| 3181 | Dreher, George R. | Midland, TX 79702 | Oil & Gas Operator | Jan 2018 |
| 3182 | Drennan Oil L.L.C. | Ballinger, TX 76821 | Oil & Gas Operator | Sep 2026 |
| 3183 | Drennan, D. E. | Graham, TX 76450 | Oil & Gas Operator | Dec 2011 |
| 3184 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 3185 | DRH Properties LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 3186 | Driftwood Energy Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2022 |
| 3187 | Drill Partners Management, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2010 |
| 3188 | Drillers Energy Search, Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 3189 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 3190 | Drillmar Operating Company | Houston, TX 77019 | Oil & Gas Operator | Jun 2013 |
| 3191 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Sep 2026 |
| 3192 | Drilmor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 1998 |
| 3193 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2026 |
| 3194 | DRS Exploration Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 1999 |
| 3195 | Drum Oil & Gas, Inc. | Liberty, TX 77575 | Oil & Gas Operator | Sep 2026 |
| 3196 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 3197 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2026 |
| 3198 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 3199 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 3200 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2026 |