| 101 | Tartan Resources Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 1995 |
| 102 | Tasca Exploration Company | Houston, TX 77257 | Oil & Gas Operator | Jun 2002 |
| 103 | Tascosa Petroleum Corporation | Amarillo, TX 79105 | Oil & Gas Operator | Nov 2024 |
| 104 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 105 | Tatanka Operating, LLC | Whitesboro, TX 76273 | Oil & Gas Operator | Nov 2024 |
| 106 | Tate, Larry V. Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2002 |
| 107 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 108 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 109 | Taurus Minerals, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 110 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Nov 2024 |
| 111 | Taurus Petroleum, Inc. (A) | San Antonio, TX 78259 | Oil & Gas Operator | Jul 1996 |
| 112 | Tawa Operating Co., Inc. | Mertzon, TX 76941 | Oil & Gas Operator | May 2019 |
| 113 | Tayco Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Nov 1996 |
| 114 | Taylor & Smith | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2024 |
| 115 | Taylor Energy Corporation | Amarillo, TX 79114 | Oil & Gas Operator | Feb 1999 |
| 116 | Taylor Properties | Wichita Falls, TX 76301 | Gas Operator | Nov 2024 |
| 117 | Taylor Two Energy, LLC | Big Spring, TX 79720 | Oil & Gas Operator | Aug 2019 |
| 118 | Taylor, Ben J. Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2022 |
| 119 | Taylor, Dutch | Graham, TX 76450 | Oil & Gas Operator | Jan 2016 |
| 120 | Taylor, Frank Well Service | Cross Plains, TX 76443 | Oil & Gas Operator | Aug 2003 |
| 121 | Taylor, G. E. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2001 |
| 122 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 123 | Taylor, Gordon Oil Company | Sunray, TX 79086 | Oil & Gas Operator | Apr 1996 |
| 124 | Taylor, Gordon Oil Company, LP | Sunray, TX 79086 | Oil & Gas Operator | Feb 2014 |
| 125 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Nov 2024 |
| 126 | Taylor, Raymond C. Jr. | Woodway, TX 76712 | Oil & Gas Operator | Dec 2012 |
| 127 | Taylor, Smith And Kimbell | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 128 | Taylor-Clayton-Hawley | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2019 |
| 129 | Taylor-Link Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Apr 2017 |
| 130 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 131 | TB Operating, LLC | Borger, TX 79008 | Oil & Gas Operator | Jun 2018 |
| 132 | TB Petroleum, LLC | Petrolia, TX 76377 | Oil & Gas Operator | Nov 2024 |
| 133 | TBC Petroleum | Cuero, TX 77954 | Oil & Gas Operator | Sep 2023 |
| 134 | TBM Catarina, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 135 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 136 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Nov 2024 |
| 137 | TC3 Energy Company | Dallas, TX 75248 | Oil & Gas Operator | Nov 2024 |
| 138 | TC3 Energy Services Company | Bryan, TX 77805 | Oil & Gas Operator | Jan 2005 |
| 139 | TCF Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 140 | TCS Petroleum Co., LLC | Abilene, TX 79608 | Oil & Gas Operator | Nov 2024 |
| 141 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 142 | TD Natural Resources LLC | Cuero, TX 77954 | Oil & Gas Operator | Nov 2024 |
| 143 | TD Oil & Gas LLC | Duncan, OK 73533-1851 | Oil Operator | Apr 2023 |
| 144 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 2024 |
| 145 | TDT Production, Inc. | Capitola, CA 95010 | Oil & Gas Operator | Aug 2003 |
| 146 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 147 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 148 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2024 |
| 149 | Teaco | Snyder, TX 79550 | Oil & Gas Operator | Jan 1998 |
| 150 | Teague Operating Co. | Mabank, TX 75147 | Oil & Gas Operator | Jul 1995 |
| 151 | Teague, J. V. & Robinson, E. W. | Olney, TX 76374 | Oil & Gas Operator | May 1996 |
| 152 | Teakwood Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2019 |
| 153 | Teal Energy USA, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 154 | Teal Exploration, LLC | Abilene, TX 79602 | Oil Operator | Nov 2024 |
| 155 | Teal Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2021 |
| 156 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Nov 2024 |
| 157 | Teamco Operating LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2002 |
| 158 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 159 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Aug 2024 |
| 160 | Technology & Engr. Careers Inc. | Houston, TX 77063 | Oil Operator | Dec 2017 |
| 161 | Teco Oil & Gas, Inc. | Tampa, FL 33601 | Oil & Gas Operator | Nov 1997 |
| 162 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 163 | Tecolote Energy Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 164 | Tecolote Petroleum Corp.,Inc. | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2011 |
| 165 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 166 | Tega Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2012 |
| 167 | Tejas Gas Pipeline Company | Houston, TX 77010 | Oil & Gas Operator | Apr 1998 |
| 168 | Tejas Gas Pipeline, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2002 |
| 169 | Tejas Jack Sales, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Nov 2024 |
| 170 | Tejas Operating Company, Inc. | Houston, TX 77257 | Oil & Gas Operator | May 1995 |
| 171 | Tejas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2024 |
| 172 | Tejas Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 173 | Tejas Permian Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 174 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Nov 2024 |
| 175 | Tejas Trucking, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Nov 2024 |
| 176 | Tejas Western Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2018 |
| 177 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2024 |
| 178 | Teke Production LLC | Austin, TX 78746 | Oil Operator | Nov 2024 |
| 179 | Tekna Synergy Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 180 | Teleo Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2009 |
| 181 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Nov 2024 |
| 182 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Nov 2024 |
| 183 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 184 | Tember Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Nov 2024 |
| 185 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 186 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2024 |
| 187 | Templeton Oil, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 188 | Tempo Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 189 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 190 | Tend Oil Inc. | Tyler, TX 75703 | Oil & Gas Operator | Jul 1995 |
| 191 | Tenex Corporation | Houston, TX 77227 | Oil & Gas Operator | Dec 2007 |
| 192 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 193 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 194 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Nov 2024 |
| 195 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Aug 2024 |
| 196 | Tennessee Gas Pipeline Company, LLC | Houston, TX 77252 | Oil Operator | May 2024 |
| 197 | Tensas Delta Explo. Co., LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 198 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 199 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 200 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |