| 3101 | Dewco Exploration | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 3102 | DFG Energy Company LLC | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 3103 | DG&E/Slocum, Limited Partnership | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 3104 | DH Operating, Inc. | Gordon, TX 76453 | Oil & Gas Operator | Feb 2026 |
| 3105 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 3106 | DHC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1997 |
| 3107 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 3108 | Diamond "S" Oil, Inc. | Houston, TX 77065 | Oil & Gas Operator | Apr 1994 |
| 3109 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 3110 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 3111 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | Feb 2026 |
| 3112 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Feb 2026 |
| 3113 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | Feb 2026 |
| 3114 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 3115 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2026 |
| 3116 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 3117 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Dec 2025 |
| 3118 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Feb 2026 |
| 3119 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 3120 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 3121 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2026 |
| 3122 | Diamond T F Enterprises, Inc. | Sonora, TX 76950 | Gas Operator | Feb 2026 |
| 3123 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 3124 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Sep 2016 |
| 3125 | Diamondback Operating, LP | Tulsa, OK 74132 | Gas Operator | Feb 2026 |
| 3126 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 3127 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 3128 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | Feb 2026 |
| 3129 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 3130 | Digital Operating Company LLC | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 3131 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Feb 2026 |
| 3132 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 3133 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 3134 | Diller Oil Company | Baird, TX 79504 | Oil Operator | Feb 2026 |
| 3135 | Dillon, H. L., Jr. | Houston, TX 77027 | Oil & Gas Operator | Mar 1996 |
| 3136 | Dime Box Oil Company | Austin, TX 78759 | Oil & Gas Operator | Mar 2008 |
| 3137 | Dimmit County SWD, LLC | Carrizo SPGS, TX 78834 | Oil Operator | Feb 2026 |
| 3138 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Feb 2026 |
| 3139 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 3140 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 3141 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 3142 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Feb 2026 |
| 3143 | Dirks Petroleum Company | Beeville, TX 78104 | Oil & Gas Operator | Feb 2026 |
| 3144 | Dirks, R. W. | Tuleta, TX 78162 | Oil & Gas Operator | May 1999 |
| 3145 | Dirks, R.W. Pet. Eng. Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 1999 |
| 3146 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Feb 2026 |
| 3147 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 3148 | Discovery Energy Corp. CC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2026 |
| 3149 | Discovery Geoservices Corp. | Dallas, TX 75206 | Gas Operator | Dec 1996 |
| 3150 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 3151 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 3152 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Feb 2026 |
| 3153 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 3154 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 3155 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 3156 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 3157 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 3158 | Dixie Lake Operating, LLC | Longview, TX 75606 | Gas Operator | Feb 2026 |
| 3159 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 3160 | Dixon, N. D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 3161 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 3162 | DJ Exploration, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Feb 2026 |
| 3163 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 3164 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 3165 | DJH Investments, Inc. | Houston, TX 77024 | Oil Operator | Feb 2026 |
| 3166 | DJH Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 3167 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 3168 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 3169 | DKMR Oil Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2017 |
| 3170 | DKW Energy, Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Feb 2026 |
| 3171 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 3172 | DLM Energy | Houston, TX 77058 | Oil & Gas Operator | Sep 1994 |
| 3173 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 3174 | Dmaebil Corporation | Grapevine, TX 76051 | Gas Operator | Jan 2024 |
| 3175 | DML Exploration, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 3176 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 3177 | DMV Pipeline LLC | Lipan, TX 76462 | Oil & Gas Operator | Feb 2026 |
| 3178 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 3179 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 3180 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 3181 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 3182 | Dodson Prairie Oil & Gas LLC | San Antonio, TX 78205 | Gas Operator | Feb 2026 |
| 3183 | Dodson, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 1998 |
| 3184 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 3185 | Doege, Donald | La Vernia, TX 78121 | Oil & Gas Operator | Feb 2026 |
| 3186 | Doege, Harry | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 3187 | Doenges, William C. | Pampa, TX 79065 | Gas Operator | Jun 1993 |
| 3188 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Feb 2026 |
| 3189 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |
| 3190 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Feb 2026 |
| 3191 | Dolch Production, Inc. | San Antonio, TX 78248 | Oil & Gas Operator | Jul 1996 |
| 3192 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 3193 | Dolphin Petroleum, LP | Alice, TX 78333 | Oil & Gas Operator | Feb 2026 |
| 3194 | Domestic Crude | Graham, TX 76450 | Oil & Gas Operator | Jul 2000 |
| 3195 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 3196 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 3197 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 3198 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 3199 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 3200 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |