| 3001 | Devx Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Feb 2004 |
| 3002 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Jul 2025 |
| 3003 | Dewbre, Jerry C., Trustee | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Jul 2025 |
| 3004 | Dewco Exploration | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 3005 | Dewey Petroleum | Midland, TX 79707 | Oil & Gas Operator | Dec 2020 |
| 3006 | DFG Energy Company LLC | Eastland, TX 76448 | Oil & Gas Operator | Jul 2025 |
| 3007 | DG&E/Slocum, Limited Partnership | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 3008 | DH Operating, Inc. | Gordon, TX 76453 | Oil & Gas Operator | Jul 2025 |
| 3009 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 3010 | DHC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1997 |
| 3011 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 3012 | Diamond "S" Oil, Inc. | Houston, TX 77065 | Oil & Gas Operator | Apr 1994 |
| 3013 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 3014 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 3015 | Diamond Energy Services, LP | Tulsa, OK 74103 | Oil Operator | Jul 2025 |
| 3016 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Jul 2025 |
| 3017 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | Jul 2025 |
| 3018 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 3019 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 3020 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 3021 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | May 2025 |
| 3022 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Jul 2025 |
| 3023 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 3024 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Jul 2025 |
| 3025 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Jul 2025 |
| 3026 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 3027 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 3028 | Diamondback Operating, LP | Tulsa, OK 74132 | Gas Operator | Jul 2025 |
| 3029 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 3030 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 3031 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 3032 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 3033 | Digital Operating Company LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 3034 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Jul 2025 |
| 3035 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 3036 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 3037 | Diller Oil Company | Baird, TX 79504 | Oil Operator | Jul 2025 |
| 3038 | Dillon, H. L., Jr. | Houston, TX 77027 | Oil & Gas Operator | Mar 1996 |
| 3039 | Dime Box Oil Company | Austin, TX 78759 | Oil & Gas Operator | Mar 2008 |
| 3040 | Dimmit County SWD, LLC | Carrizo SPGS, TX 78834 | Oil Operator | Jul 2025 |
| 3041 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Jul 2025 |
| 3042 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 3043 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 3044 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 3045 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Jul 2025 |
| 3046 | Dirks Petroleum Company | Beeville, TX 78104 | Oil & Gas Operator | Jul 2025 |
| 3047 | Dirks, R. W. | Tuleta, TX 78162 | Oil & Gas Operator | May 1999 |
| 3048 | Dirks, R.W. Pet. Eng. Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 1999 |
| 3049 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 2025 |
| 3050 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 3051 | Discovery Energy Corp. CC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2025 |
| 3052 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 3053 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 3054 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Jul 2025 |
| 3055 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 3056 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 3057 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Jul 2025 |
| 3058 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 3059 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 3060 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 3061 | Dixon, N. D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 3062 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 3063 | DJ Exploration, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Jul 2025 |
| 3064 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 3065 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 3066 | DJH Investments, Inc. | Houston, TX 77024 | Oil Operator | Jul 2025 |
| 3067 | DJH Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 3068 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Jul 2025 |
| 3069 | DK Oil Company | Winters, TX 79567 | Oil & Gas Operator | Jul 2022 |
| 3070 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 3071 | DKMR Oil Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2017 |
| 3072 | DKW Energy, Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Jul 2025 |
| 3073 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 3074 | DLM Energy | Houston, TX 77058 | Oil & Gas Operator | Sep 1994 |
| 3075 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 3076 | DML Exploration, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 3077 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 3078 | DMV Pipeline LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 3079 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2025 |
| 3080 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Jul 2025 |
| 3081 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 3082 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 3083 | Dodson Prairie Oil & Gas LLC | San Antonio, TX 78205 | Gas Operator | Jul 2025 |
| 3084 | Dodson, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 1998 |
| 3085 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 3086 | Doege, Donald | La Vernia, TX 78121 | Oil & Gas Operator | Jul 2025 |
| 3087 | Doege, Harry | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 3088 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Jul 2025 |
| 3089 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Jul 2025 |
| 3090 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Jul 2025 |
| 3091 | Dolch Production, Inc. | San Antonio, TX 78248 | Oil & Gas Operator | Jul 1996 |
| 3092 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 3093 | Dolphin Petroleum, LP | Alice, TX 78333 | Oil & Gas Operator | Jul 2025 |
| 3094 | Domestic Crude | Graham, TX 76450 | Oil & Gas Operator | Jul 2000 |
| 3095 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 3096 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 3097 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 3098 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Jul 2025 |
| 3099 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 3100 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |