| 3001 | De Central Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 3002 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 3003 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 3004 | De La Torre Oil & Gas, Inc | McAllen, TX 78501 | Oil & Gas Operator | Feb 2026 |
| 3005 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 3006 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 3007 | De V Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 3008 | De-Vac Inc. | Daisetta, TX 77533 | Oil Operator | Feb 2026 |
| 3009 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 3010 | Deagen, Bill & Sons, LTD. | Stockdale, TX 78160 | Oil Operator | May 2018 |
| 3011 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 3012 | Deanlake Operator, L.L.C. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 3013 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 3014 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 3015 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Feb 2026 |
| 3016 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 3017 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 3018 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 3019 | Dee'S Oil | Wellington, TX 79095 | Oil & Gas Operator | Mar 2008 |
| 3020 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 3021 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 3022 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | Feb 2026 |
| 3023 | Deep Reef Industries | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2004 |
| 3024 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 3025 | Defranco Oil Account | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2004 |
| 3026 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 3027 | Deguello Operating LLC | College Sta, TX 77840 | Oil & Gas Operator | Feb 2026 |
| 3028 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 3029 | Del Mar | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 3030 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Feb 2026 |
| 3031 | Del Mar Exploration Company | Houston, TX 77006 | Oil & Gas Operator | Jan 2014 |
| 3032 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 3033 | Del Rio Production Co. | Gainesville, TX 76240 | Oil Operator | Mar 2019 |
| 3034 | Delaney Oil And Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 3035 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 3036 | Delaware Ecco Petroleum Inc. | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2001 |
| 3037 | Delcar, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1995 |
| 3038 | Delco Operating Company LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 3039 | Delek Energy Systems Us, Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 3040 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 3041 | Delgado, Emil A | San Antonio, TX 78223 | Oil & Gas Operator | Sep 2016 |
| 3042 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 3043 | Delmar Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 1996 |
| 3044 | Delong, Horace | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 3045 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 3046 | Delta C02, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2021 |
| 3047 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 3048 | Delta Exploration, LLC | Fredericksbrg, TX 78624 | Oil Operator | Oct 2025 |
| 3049 | Delta Hydrocarbons, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Sep 1997 |
| 3050 | Delta Oil | Holliday, TX 76366 | Oil & Gas Operator | Sep 2005 |
| 3051 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 3052 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 3053 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 3054 | Deltex Minerals Inc. | Peachtree Cty, GA 30269 | Oil & Gas Operator | Feb 2026 |
| 3055 | Delwintex Oil & Gas Prop., Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2003 |
| 3056 | Demand Energy, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 1999 |
| 3057 | Demers - Fleming | Wichita Falls, TX 76305 | Oil & Gas Operator | Mar 2008 |
| 3058 | Demers Oil Production | Byers, TX 76357 | Oil & Gas Operator | Apr 2002 |
| 3059 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 3060 | Den Cal, Inc. | Borger, TX 79007 | Oil & Gas Operator | Feb 2026 |
| 3061 | Den-Kay Corp. | Plano, TX 75074 | Oil Operator | Aug 2009 |
| 3062 | Denali Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Nov 2018 |
| 3063 | Denali Oil & Gas Management LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 3064 | Denali Petroleum, LLC | Arlington, TX 76006 | Oil Operator | Mar 2021 |
| 3065 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 3066 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 3067 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 3068 | Denhart & Denhart | Brownwood, TX 76804 | Oil & Gas Operator | Dec 2001 |
| 3069 | Denman-Friesen Co. | Lufkin, TX 75901 | Oil & Gas Operator | Nov 2006 |
| 3070 | Dennis & Broun | Bullard, TX 75757 | Oil & Gas Operator | Sep 2003 |
| 3071 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 3072 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 3073 | Denny'S Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2000 |
| 3074 | Denoco Inc. | Plano, TX 75086 | Oil & Gas Operator | Mar 2008 |
| 3075 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 3076 | Denpac Corporation | Colorado SPGS, CO 80922 | Oil & Gas Operator | Feb 2026 |
| 3077 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 3078 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2026 |
| 3079 | Denton Oil & Gas | Argyle, TX 76226 | Oil Operator | Dec 2014 |
| 3080 | Denver Energy Exploration,LLC | Canyon Lake, TX 78133 | Oil Operator | Feb 2026 |
| 3081 | Derby Oil Of Texas | Ventura, CA 93003 | Oil & Gas Operator | May 1996 |
| 3082 | Derrick Exploration, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jan 2003 |
| 3083 | Derrick Oil & Gas, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Aug 2003 |
| 3084 | Derwen Operating Company | Houston, TX 77098 | Gas Operator | Dec 2009 |
| 3085 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 3086 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 3087 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 3088 | Desert States Energy, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Aug 1995 |
| 3089 | Devilbiss Contracting, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2005 |
| 3090 | Devine, C. R., Inc. | Houston, TX 77292 | Oil & Gas Operator | Feb 2018 |
| 3091 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 3092 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 3093 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 3094 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 3095 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2015 |
| 3096 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 3097 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 3098 | Devx Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Feb 2004 |
| 3099 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2026 |
| 3100 | Dewbre, Jerry C., Trustee | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2026 |