| 11201 | Turrentine Oil And Gas | Levelland, TX 79336 | Oil & Gas Operator | Feb 1996 |
| 11202 | Tuskar (Texas), Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2016 |
| 11203 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 11204 | TWCS Operating Co., LLC | MC Gregor, TX 76657 | Oil Operator | Apr 2024 |
| 11205 | Twilco Operating LLC | Holliday, TX 76366 | Oil Operator | Apr 2024 |
| 11206 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Apr 2024 |
| 11207 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 11208 | Twins Oil Co. | Monahans, TX 79756 | Oil & Gas Operator | Apr 2024 |
| 11209 | Two Bit Operating Company LLC | Fort Worth, TX 76110 | Oil & Gas Operator | Apr 2024 |
| 11210 | Two Black Bears Oil, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2003 |
| 11211 | Two Oaks Operating Company, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2008 |
| 11212 | Two P Partners, LLC | Golden, CO 80401 | Oil & Gas Operator | Apr 2024 |
| 11213 | Twojo, Inc. | Longview, TX 75601 | Oil & Gas Operator | Nov 1996 |
| 11214 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 11215 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Apr 2024 |
| 11216 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 11217 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Apr 2024 |
| 11218 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Apr 2024 |
| 11219 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 11220 | Txok Texas Energy Resources,L.P. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2008 |
| 11221 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 11222 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2024 |
| 11223 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 11224 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 11225 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 11226 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Apr 2024 |
| 11227 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 11228 | Tyco Operating Co. | Throckmorton, TX 76483 | Oil & Gas Operator | Apr 2024 |
| 11229 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 11230 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 11231 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 11232 | U S Energy Corp. Of Amer. Inc. | Ranger, TX 76470 | Oil & Gas Operator | Apr 2024 |
| 11233 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2024 |
| 11234 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2024 |
| 11235 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 11236 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 11237 | U.S. Energy Development Corp | Arlington, TX 76011 | Oil & Gas Operator | Apr 2024 |
| 11238 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 11239 | U.S. Sovereign Oil And Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Apr 2024 |
| 11240 | U.S.A. Plugging Company | Pearsall, TX 78061 | Oil & Gas Operator | Apr 2024 |
| 11241 | U1 Ranch Oil | Weesatche, TX 77993 | Oil & Gas Operator | Apr 2024 |
| 11242 | Ubetco, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2024 |
| 11243 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Apr 2024 |
| 11244 | Ulatex Oil & Gas Inc. | Nocona, TX 76255 | Oil & Gas Operator | Dec 1998 |
| 11245 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Apr 2024 |
| 11246 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 11247 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Jan 2024 |
| 11248 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 11249 | Unbridled Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 11250 | Underwood, Jim | Graham, TX 76450 | Oil & Gas Operator | Mar 2018 |
| 11251 | Unicorn Energy, Inc. | Elgin, TX 78621 | Oil & Gas Operator | Apr 2024 |
| 11252 | Unified Oil & Gas Corp. | Snyder, TX 79550 | Oil Operator | Apr 2024 |
| 11253 | Union Crude Company | Baytown, TX 77521 | Oil & Gas Operator | Apr 2018 |
| 11254 | Union Crude Operating Co. | Baytown, TX 77521 | Oil Operator | Aug 2003 |
| 11255 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | Apr 2024 |
| 11256 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 11257 | Union Pacific Austin Chalk Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 11258 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 11259 | Union Royalty, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jul 2014 |
| 11260 | Union Seaboard Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 11261 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 11262 | United Company | Lubbock, TX 79408 | Oil & Gas Operator | Jun 1995 |
| 11263 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 11264 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 11265 | United Energy Partners, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 11266 | United Energy Trading LLC | Tulsa, OK 74133 | Gas Operator | Feb 2015 |
| 11267 | United Oil & Minerals L. P. | Austin, TX 78746 | Oil & Gas Operator | Jun 2003 |
| 11268 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 11269 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 11270 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 11271 | United Petroleum & Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 11272 | United Petroleum Technologies | Hondo, TX 78861 | Oil & Gas Operator | Aug 2001 |
| 11273 | United Production Company LLC | Edmond, OK 73083-5348 | Oil & Gas Operator | Jan 2024 |
| 11274 | United Resources LP | Austin, TX 78746 | Oil & Gas Operator | Oct 2011 |
| 11275 | United States Gypsum Company | Oakfield, NY 14125 | Oil & Gas Operator | Dec 2022 |
| 11276 | United Texas Oil LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 11277 | United Texas Petroleum Inc. | McKinney, TX 75070 | Oil & Gas Operator | Apr 2024 |
| 11278 | United World Energy, Inc. | Aurora, CO 80040 | Oil & Gas Operator | Apr 2024 |
| 11279 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 11280 | Universal Geopower LLC | Houston, TX 77057 | Oil & Gas Operator | May 2016 |
| 11281 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 11282 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 11283 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2022 |
| 11284 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 |
| 11285 | Unoso Operating Company L.L.C. | Georgetown, TX 78633 | Oil & Gas Operator | Apr 2024 |
| 11286 | Unswept Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Jan 2018 |
| 11287 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Apr 2024 |
| 11288 | Upcurve Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 11289 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 11290 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 11291 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 11292 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Apr 2024 |
| 11293 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 11294 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2024 |
| 11295 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 11296 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jan 2024 |
| 11297 | Uplift Production Company, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Feb 1999 |
| 11298 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 11299 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 11300 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2024 |