| 201 | Tamoil | | Oil Operator | May 2017 |
| 202 | Tampke Service Co. | Devine, TX 78016 | Oil Operator | Jul 2025 |
| 203 | Tamworth Resources LLC | Broken Arrow, OK 74012-0005 | Oil & Gas Operator | Apr 2025 |
| 204 | Tana Exploration Company LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2021 |
| 205 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 206 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 207 | Tandem Oil Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Oct 1998 |
| 208 | Tanglehead Operating, LLC | La Vernia, TX 78121 | Oil Operator | Jul 2025 |
| 209 | Tanglewood Expl LLC | Fort Worth, TX 76102-4665 | Gas Operator | Jun 2011 |
| 210 | Tanglewood Oil & Gas Co. | Gouldbusk, TX 76845 | Oil & Gas Operator | Jul 2025 |
| 211 | Tanglewood Oil & Gas LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2017 |
| 212 | Tank Truck'S Inc | Sapulpa, OK 74066 | Oil Operator | May 2025 |
| 213 | Tankersley, D. C. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 214 | Tannehill Oil Company | | Oil & Gas Operator | Dec 1991 |
| 215 | Tanner Oil, Inc | | Oil & Gas Operator | Nov 2024 |
| 216 | Tanner, M.B. | Moline, KS 67353 | Oil Operator | Apr 1986 |
| 217 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 218 | Tanos Exploration IV, LLC | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 219 | Tanos Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 220 | Tanos Production, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2003 |
| 221 | Tansky J/Tansky Oil Prod | Logan, OH 43138 | Oil & Gas Operator | Dec 1997 |
| 222 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 223 | Tap Management Inc | Austin, TX 78757 | Oil & Gas Operator | Jan 2023 |
| 224 | Tap Operating Company, Inc. | Mexia, TX 76667 | Oil & Gas Operator | May 1995 |
| 225 | Tap Petroleum Inc | Cleveland, OK 74020-0054 | Oil & Gas Operator | Apr 2020 |
| 226 | Tap Rock Operating, LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2025 |
| 227 | Tapo Energy, LLC | West Union, WV 26456 | Oil & Gas Operator | Dec 2021 |
| 228 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 229 | Tapp, Deborah Trust | Madisonville, KY 42431 | Oil Operator | Dec 2023 |
| 230 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 231 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 232 | Tara Company, The | Wichita Falls, TX 76301 | Oil Operator | Sep 2003 |
| 233 | Tara Oil Company | | Oil Operator | Dec 1981 |
| 234 | Tara Operating Co. | Lamesa, TX 79331 | Oil & Gas Operator | Aug 2003 |
| 235 | Tarco Energy, LC | Lubbock, TX 79423 | Oil & Gas Operator | Jan 2025 |
| 236 | Tare Resources, LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2025 |
| 237 | Targa Development, Inc. | Clarksburg, WV 26301-0000 | Oil & Gas Operator | Dec 2021 |
| 238 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 239 | Targa Pipeline Mid-Continent LLC | Sulphur, LA 70665 | Oil & Gas Operator | Jun 2018 |
| 240 | Targa Pipeline Mid-Continent Westok LLC | Sulphur, LA 70665 | Gas Operator | Mar 2025 |
| 241 | Targe Energy Exploration And Production, LLC | Denver, CO 80202 | Gas Operator | Oct 2013 |
| 242 | Target Drilling | | Oil & Gas Operator | Feb 2018 |
| 243 | Target Energy Inc | Indiana, PA 15701-1135 | Oil & Gas Operator | Dec 2013 |
| 244 | Target Engery Corp | Brecksville, OH 44141 | Oil & Gas Operator | Dec 1992 |
| 245 | Target Oil & Gas Corp | | Oil & Gas Operator | Dec 2013 |
| 246 | Target Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2011 |
| 247 | Target Oil Company | | Oil & Gas Operator | Mar 2007 |
| 248 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 249 | Tarka Energy LLC | Houston, TX 77056-1940 | Oil & Gas Operator | Mar 2022 |
| 250 | Tarpon Oil & Gas Co. | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2025 |
| 251 | Tarpon Oil Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2017 |
| 252 | Tarpon Oil Of Texas | | Oil & Gas Operator | Aug 1994 |
| 253 | Tarrant Operators, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 1994 |
| 254 | Tarrant Tracy Dba Trace Oil | Crescent, OK 73028 | Oil & Gas Operator | Feb 2021 |
| 255 | Tartan Resources Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 1995 |
| 256 | Tarter Bros | Dunnville, KY 42528 | Oil Operator | Dec 2023 |
| 257 | Tarter, David | Dunnville, KY 45528 | Oil & Gas Operator | Dec 2023 |
| 258 | Tarter, Donald & David | Dunnville, KY 42528 | Oil Operator | Dec 2020 |
| 259 | Tarwater Oil & Gas LLC | San Jose, CA 95128-4219 | Oil & Gas Operator | Dec 2023 |
| 260 | Tasca Exploration Company | Houston, TX 77257 | Oil & Gas Operator | Jun 2002 |
| 261 | Tascosa Energy Partners, L.L.C | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 262 | Tascosa Petroleum Corporation | Amarillo, TX 79105 | Oil & Gas Operator | Jul 2025 |
| 263 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 264 | Tatanka Operating, LLC | Whitesboro, TX 76273 | Oil & Gas Operator | Jul 2025 |
| 265 | Tatco Petroleum Oper Inc | Canton, OH 44735 | Oil & Gas Operator | Dec 1989 |
| 266 | Tatco, Inc. | | Oil & Gas Operator | May 1991 |
| 267 | Tate Exploration | Lakin, KS 67860 | Oil & Gas Operator | Sep 1994 |
| 268 | Tate Gas Company | Glenville, WV 26351-0000 | Oil & Gas Operator | Dec 2021 |
| 269 | Tate, Larry V. Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2002 |
| 270 | Tatonka Oil Co LLC | Columbus, OH 43201-3684 | Oil & Gas Operator | Dec 2024 |
| 271 | Tatum Petroleum Co LLC | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2018 |
| 272 | Tatum Petroleum Corporation | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2008 |
| 273 | Tau Ventures | Tulsa, OK 74105-1026 | Oil & Gas Operator | Apr 2025 |
| 274 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 275 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 276 | Taurus Exploration, Inc. | | Oil & Gas Operator | Mar 2025 |
| 277 | Taurus Minerals Inc /Osage Only | | Oil Operator | Aug 2013 |
| 278 | Taurus Minerals, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 279 | Taurus Oil Compa | | Oil Operator | Oct 1994 |
| 280 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 281 | Taurus Petr-Fieldcrest Petr | | Oil & Gas Operator | Apr 1989 |
| 282 | Taurus Petroleum | | Oil & Gas Operator | Jul 1987 |
| 283 | Taurus Petroleum, Inc. (A) | San Antonio, TX 78259 | Oil & Gas Operator | Jul 1996 |
| 284 | Tauy Oil, Inc | Baldwin City, KS 66006 | Oil Operator | Mar 2025 |
| 285 | Tawa Operating Co., Inc. | Mertzon, TX 76941 | Oil & Gas Operator | May 2019 |
| 286 | Tayco Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Nov 1996 |
| 287 | Taylor & Smith | Gainesville, TX 76240 | Oil & Gas Operator | Jul 2025 |
| 288 | Taylor Cliff | | Oil & Gas Operator | Apr 2025 |
| 289 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 290 | Taylor Energy Corporation | Amarillo, TX 79114 | Oil & Gas Operator | Feb 1999 |
| 291 | Taylor Explorati | | Oil & Gas Operator | Jun 1985 |
| 292 | Taylor Florence | | Oil Operator | Mar 1995 |
| 293 | Taylor International Inc | Drumright, OK 74030-1173 | Oil & Gas Operator | Mar 2020 |
| 294 | Taylor James A | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 295 | Taylor Lee | MT Gilead, OH 43338 | Oil Operator | Dec 1993 |
| 296 | Taylor Oil #13 LLC | Lander, WY 82520 | Oil Operator | May 2025 |
| 297 | Taylor Oil & Gas Serv | Snyder, TX 79549 | Oil Operator | Jul 2025 |
| 298 | Taylor Oil Co. | Edmond, OK 73034 | Oil & Gas Operator | Mar 2025 |
| 299 | Taylor Petroleum LLC | Crescent, OK 73028-0340 | Oil & Gas Operator | Dec 2016 |
| 300 | Taylor Production Company | Collinsville, OK 74021 | Oil Operator | Nov 1998 |