| 1001 | Star Falcon Oil Co. | | Oil Operator | Feb 1986 |
| 1002 | Stewart Oil Company | | Oil Operator | Jun 2009 |
| 1003 | Stinhall Corporation | | Oil & Gas Operator | Apr 1989 |
| 1004 | Stratco Operating Co., Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 1005 | Stroud Operating LLC | | Oil & Gas Operator | Dec 2012 |
| 1006 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Mar 2025 |
| 1007 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 1008 | Stuart Oil | | Oil Operator | Jan 2025 |
| 1009 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 1010 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |
| 1011 | Sugar Oil Company | | Oil & Gas Operator | Feb 2011 |
| 1012 | Sullivan Well Service | | Oil Operator | Mar 2010 |
| 1013 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 2025 |
| 1014 | Summit Gas LLC | | Oil & Gas Operator | Oct 2011 |
| 1015 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Jan 2025 |
| 1016 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 1017 | Sundance Energy Corporation | | Oil & Gas Operator | Jan 2025 |
| 1018 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 1019 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 1020 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 1021 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 1022 | T & R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 1023 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 1024 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 1025 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 1026 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Mar 2025 |
| 1027 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 1028 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 1029 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 1030 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 1031 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 1032 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 1033 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 1034 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 1035 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 1036 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 1037 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 1038 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 1039 | Tellus Operating Group, LLC | | Oil & Gas Operator | Dec 2024 |
| 1040 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2024 |
| 1041 | Tensas Delta Exploration Company, LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 1042 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 1043 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 1044 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 1045 | Tervita, LLC | | Oil Operator | May 2021 |
| 1046 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Mar 2025 |
| 1047 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 1048 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Mar 2025 |
| 1049 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 1050 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 1051 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | Mar 2025 |
| 1052 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Mar 2025 |
| 1053 | The Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Nov 2024 |
| 1054 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 1055 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 1056 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 1057 | Thor Production Co. | | Oil Operator | May 1997 |
| 1058 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Mar 2025 |
| 1059 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 1060 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2025 |
| 1061 | Tigner Walker | | Oil & Gas Operator | Dec 2021 |
| 1062 | Tigner Walker Et Al | | Oil & Gas Operator | Aug 2000 |
| 1063 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 1064 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 1065 | Tma Production, LLC | | Oil Operator | Dec 2024 |
| 1066 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Mar 2025 |
| 1067 | Todd Oil Production Co | | Oil Operator | Aug 2001 |
| 1068 | Tolbert & Associates | | Oil Operator | Dec 2024 |
| 1069 | Tolbert Et Al | | Oil Operator | Jun 2000 |
| 1070 | Tolbert Well Service | | Oil Operator | Jan 2025 |
| 1071 | Tom Moore Trustee | | Oil Operator | Apr 1986 |
| 1072 | Tommy A. Paul | | Oil Operator | Oct 2020 |
| 1073 | Topaz Oil Company | Diboll, TX 75941 | Oil & Gas Operator | Apr 1994 |
| 1074 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 1075 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 1076 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 1077 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 1078 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 1079 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 1080 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 1081 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 1082 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2025 |
| 1083 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 1084 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 1085 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 1086 | Triple L Operating Company LLC | Kilgore, TX 75663 | Oil Operator | Mar 2025 |
| 1087 | Triple S Oil Company | | Oil & Gas Operator | Feb 1979 |
| 1088 | Tristate Nla, LLC | | Oil Operator | Dec 2024 |
| 1089 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 1090 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 1091 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Mar 2025 |
| 1092 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 1093 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 1094 | U. O. C., Inc. | | Oil Operator | Jun 2019 |
| 1095 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 1096 | Uni Production Company, Inc. | | Oil & Gas Operator | Apr 1988 |
| 1097 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 1098 | Universal Oil Co. | | Oil Operator | Jan 2025 |
| 1099 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 1100 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |