| 201 | Tend Oil Inc. | Tyler, TX 75703 | Oil & Gas Operator | Jul 1995 |
| 202 | Tenex Corporation | Houston, TX 77227 | Oil & Gas Operator | Dec 2007 |
| 203 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 204 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Jun 2025 |
| 205 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Jun 2025 |
| 206 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 207 | Tennessee Gas Pipeline Company, LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 208 | Tensas Delta Explo. Co., LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 209 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 210 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 211 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 212 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 213 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 214 | Terra Locus Services | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 215 | Terrace Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2013 |
| 216 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Oct 2025 |
| 217 | Terrapin Energy LLC | Okmulgee, OK 74447 | Oil Operator | Jun 2025 |
| 218 | Terreland Corporation | Sunray, TX 79086 | Oil & Gas Operator | Oct 2004 |
| 219 | Terrell Oil & Gas Production Co. | Hamlin, TX 79520 | Oil & Gas Operator | Oct 2025 |
| 220 | Terrick Resources | Midland, TX 79708 | Oil & Gas Operator | Jul 2005 |
| 221 | Terry Enterprises, Inc. | West Columbia, TX 77486 | Oil & Gas Operator | Oct 2025 |
| 222 | Terry Petroleum Company | Houston, TX 77270 | Oil & Gas Operator | Dec 1997 |
| 223 | Terry'S Roustabout Service, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2002 |
| 224 | Terry, Lewis D. | Olney, TX 76374 | Oil & Gas Operator | Sep 1995 |
| 225 | Terry, R. K. | West Columbia, TX 77486 | Oil & Gas Operator | Oct 2025 |
| 226 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 227 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 228 | Tess Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 229 | Tessara Petroleum Resources, LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 230 | Tesuque Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Oct 2025 |
| 231 | Teton Petroleum Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Oct 2025 |
| 232 | Tetragon Investments, LLC | Abilene, TX 79604 | Oil Operator | Jul 2014 |
| 233 | Tettleton, Jon Otis | Nocona, TX 76255 | Oil & Gas Operator | Aug 2003 |
| 234 | Tettleton, Steven B. | Nocona, TX 76255 | Oil Operator | Oct 2025 |
| 235 | Tex-Am Petroleum Corp. | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 236 | Tex-Am-Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 237 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 238 | Tex-Atic Resources, Inc. | S. Lake Tahoe, CA 96150 | Oil & Gas Operator | Oct 2025 |
| 239 | Tex-Lee Operating Company | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 240 | Tex-Oak, Inc. | Oklahoma City, OK 73155 | Oil & Gas Operator | Dec 1995 |
| 241 | Tex-Ok Energy, Limited Partnership | Cody, WY 82414 | Oil & Gas Operator | Jul 2025 |
| 242 | Tex-Ok Energy, LTD Partnership | Cody, WY 82414 | Oil & Gas Operator | Oct 2025 |
| 243 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 244 | Tex-Well Oil & Gas Corp. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 245 | Texacal, Inc. | Newport Beach, CA 92660 | Oil & Gas Operator | Oct 2025 |
| 246 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 247 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 248 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 249 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 250 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 251 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 252 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 253 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 254 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 255 | Texan Petroleum Corporation | Dallas, TX 75204 | Oil & Gas Operator | Oct 2004 |
| 256 | Texan Production | Pearsall, TX 78061 | Oil & Gas Operator | Aug 2003 |
| 257 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | Oct 2025 |
| 258 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 259 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 260 | Texas Coastal Resources LLC | Fairhope, AL 36532 | Oil Operator | Oct 2025 |
| 261 | Texas Concho Operating Co. | Eldorado, TX 76936 | Oil & Gas Operator | Mar 1999 |
| 262 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 263 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 264 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 265 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 266 | Texas Energy & Environmental Inc | Houston, TX 77269 | Oil & Gas Operator | Oct 1998 |
| 267 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 268 | Texas Energy Reserves, Inc | New Braunfels, TX 78130 | Oil & Gas Operator | Jun 1996 |
| 269 | Texas Energy Sources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Mar 2008 |
| 270 | Texas Energy Trust Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2016 |
| 271 | Texas Exploration & Prod. Co. | Gainesville, TX 76240 | Oil & Gas Operator | Apr 1996 |
| 272 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Oct 2025 |
| 273 | Texas Gas Resources, Inc. | Houston, TX 77292 | Oil & Gas Operator | Jul 2009 |
| 274 | Texas Gulf Gas Corporation | Fayetteville, TX 78940 | Oil & Gas Operator | Jun 2005 |
| 275 | Texas Hydrogen Energy Corp. | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 276 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 277 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 278 | Texas Independent Oil Co., LLC | Argyle, TX 76226 | Oil & Gas Operator | Oct 2025 |
| 279 | Texas International Oper., LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2013 |
| 280 | Texas International Resource LLC | Allen, TX 75013 | Oil Operator | Oct 2025 |
| 281 | Texas Investments | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 282 | Texas Land & Petro Co., LLC | Carrollton, TX 75010 | Oil & Gas Operator | Oct 2025 |
| 283 | Texas Land & Trading Co, Inc. | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 284 | Texas Lone Star Petroleum Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2013 |
| 285 | Texas M.O.R., Inc. | Corsicana, TX 75109 | Oil Operator | Sep 2013 |
| 286 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 287 | Texas Mineral Group | Midland, TX 79705 | Oil & Gas Operator | Aug 2013 |
| 288 | Texas Moran Exploration Company | Houston, TX 77098 | Oil & Gas Operator | Jun 2023 |
| 289 | Texas Offshore Operations, LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Oct 2025 |
| 290 | Texas Oil And Gas Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Oct 2025 |
| 291 | Texas Oil Company, The | Houston, TX 77018 | Oil & Gas Operator | Aug 2006 |
| 292 | Texas Oil Resources Oper, LLC | Houston, TX 77024 | Oil Operator | Oct 2025 |
| 293 | Texas Onshore Energy, Inc. | Austin, TX 78704 | Oil & Gas Operator | Oct 2025 |
| 294 | Texas Operating & Consult., LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2018 |
| 295 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 296 | Texas Pharchem Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2019 |
| 297 | Texas Presco, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 298 | Texas Rayco Inc. | Palmetto, FL 34221 | Oil & Gas Operator | Oct 2025 |
| 299 | Texas Reexploration Operating LC | Fredericksbrg, TX 78624 | Oil & Gas Operator | Oct 2025 |
| 300 | Texas Refining, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2003 |