| 1001 | Texas Investments | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 1002 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 1003 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 1004 | Texcal Resources, Inc. | Plano, TX 75094 | Oil & Gas Operator | Apr 1994 |
| 1005 | Thagard Trust | Coyanosa, TX 79730 | Gas Operator | Jul 2025 |
| 1006 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | May 2025 |
| 1007 | Thigpin Operating, LLC | Odessa, TX 79762 | Oil Operator | Jul 2025 |
| 1008 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | Jul 2025 |
| 1009 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 1010 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 1011 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 1012 | Three Rivers Operating Co II LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 1013 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 1014 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 1015 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 1016 | Throne Delaware Resources, LLC | McKinney, TX 75072 | Oil & Gas Operator | Dec 2021 |
| 1017 | Throne Petroleum Resources LLC | Houston, TX 77006 | Oil & Gas Operator | Aug 2021 |
| 1018 | Thunder Resources LLC | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 1019 | Tidlow | Santa Fe, NM 87508 | Oil & Gas Operator | Dec 2007 |
| 1020 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Jul 2025 |
| 1021 | Tindle Petroleum LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 1022 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 1023 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 1024 | TMBR/Sharp Drilling, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2004 |
| 1025 | Toc Energy Resources, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Jul 2025 |
| 1026 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 1027 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 1028 | TPC Exploration, LLC | May, TX 76857 | Oil & Gas Operator | Jul 2025 |
| 1029 | Trace Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 1030 | Trackstar Energies LLC | Colorado Springs, CO 80919-3233 | Oil Operator | Mar 2023 |
| 1031 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1032 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 1033 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 1034 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | Jul 2025 |
| 1035 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 1036 | Tres Roughneckas WTX LLC | MC Camey, TX 79752 | Oil Operator | Jul 2025 |
| 1037 | Trey Operating Company | MC Camey, TX 79752 | Oil Operator | Jan 2016 |
| 1038 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 1039 | Trilogy Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 1040 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Jul 2025 |
| 1041 | Triple "N" Services, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 1042 | Tripp & Sons, LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2025 |
| 1043 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Jul 2025 |
| 1044 | Triumph Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 1045 | Trout Oil Company, Inc. | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 1046 | Tumbleweed Energy Limited | Midland, TX 79704 | Oil & Gas Operator | Dec 2022 |
| 1047 | Twins Oil Co. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 1048 | Two Black Bears Oil, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2003 |
| 1049 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Jul 2025 |
| 1050 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 1051 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 1052 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 1053 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 1054 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 1055 | Union Seaboard Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 1056 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 1057 | United Company | Lubbock, TX 79408 | Oil & Gas Operator | Jun 1995 |
| 1058 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 1059 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 1060 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 1061 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 1062 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 1063 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 1064 | Valley Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 1065 | Vanco Oil & Gas Corp. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 1066 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 1067 | Vanguard Permian LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 1068 | Vanguard Production Company | Lubbock, TX 79410 | Oil & Gas Operator | Jul 2025 |
| 1069 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | Jul 2025 |
| 1070 | Venture Production Service Inc. | Millersview, TX 76862 | Oil Operator | Jul 2025 |
| 1071 | Vidonia Oil LLC | Plymouth MTNG, PA 19462 | Oil Operator | Jul 2025 |
| 1072 | Vin Fisher Operating, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 1073 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 1074 | Vision Stone Petroleum, LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 1075 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 1076 | Vital Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Jul 2025 |
| 1077 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 1078 | Viva Oil Company, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Oct 2015 |
| 1079 | Vogel, A. J., Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1994 |
| 1080 | VTX Energy Operating, LLC | Austin, TX 78730 | Oil & Gas Operator | Jul 2025 |
| 1081 | W & T Offshore, L.L.C. | Houston, TX 77046 | Gas Operator | Jan 1999 |
| 1082 | W.O.G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1083 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 1084 | Walbet, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 1085 | Walker, Kent | Midland, TX 79704 | Oil & Gas Operator | Jun 2004 |
| 1086 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Jul 2025 |
| 1087 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 1088 | Walton, James A. | Midland, TX 79702 | Oil & Gas Operator | Oct 1994 |
| 1089 | Warren, Joe H. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2001 |
| 1090 | Waterbridge Texas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 1091 | Watson Packer Employee Fund | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 1092 | Way, Ralph L., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 1093 | WCWB Energy, LLC | Midland, TX 79701 | Oil Operator | Sep 2015 |
| 1094 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | May 2025 |
| 1095 | West Oil Resources, LLC | Liberty Hill, TX 78642 | Oil & Gas Operator | Jul 2025 |
| 1096 | West Texas Syndicate LLC. | Corpus Chrsti, TX 78414 | Oil Operator | Jul 2025 |
| 1097 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 1098 | Westco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Jul 2025 |
| 1099 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 1100 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |