| 30301 | Townes, Don | Clarksville, TX 75426 | Oil & Gas Operator | Apr 2025 |
| 30302 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 30303 | Townsend Operating Company | | Oil & Gas Operator | Jan 2008 |
| 30304 | Townsend V E | Ada, OK 74820 | Oil & Gas Operator | May 2013 |
| 30305 | Townsend, R. F. Trustee | Dallas, TX 75201 | Oil & Gas Operator | Dec 1994 |
| 30306 | TPC Exploration, LLC | May, TX 76857 | Oil & Gas Operator | Apr 2025 |
| 30307 | TPC Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 30308 | Tpet Management Inc. | Dallas, TX 75204 | Oil & Gas Operator | Dec 1997 |
| 30309 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 30310 | TPR - Texas Petroleum Res. Inc | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 30311 | TR Crude LLC | Independence, KS 67301 | Oil Operator | Aug 2024 |
| 30312 | TR Offshore, LLC | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2025 |
| 30313 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Feb 2025 |
| 30314 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2025 |
| 30315 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Jan 2025 |
| 30316 | Trace Operating Co & R Hudson | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 30317 | Trace Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2025 |
| 30318 | Trace Operators, Inc. | | Oil & Gas Operator | Nov 2024 |
| 30319 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 30320 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 30321 | Trachtenberg Daniel S | Houston, TX 77071-2608 | Oil Operator | Jan 2025 |
| 30322 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Apr 2025 |
| 30323 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Apr 2025 |
| 30324 | Tracker Resource Dev III, LLC | Englewood, CO 80112 | Oil & Gas Operator | Jul 2021 |
| 30325 | Tracker Resource Development II, LLC | | Oil & Gas Operator | Feb 2011 |
| 30326 | Trackstar Energies LLC | Colorado Springs, CO 80919-3233 | Oil Operator | Mar 2023 |
| 30327 | Tracy & Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 30328 | Tracy Co. | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2022 |
| 30329 | Tracy Operating Co., LLC | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2025 |
| 30330 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Apr 2025 |
| 30331 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 30332 | Tradestar Energy, Inc. | Hot Springs, AR 71913 | Oil Operator | Feb 2021 |
| 30333 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 30334 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 30335 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 30336 | Trahan Petroleum Inc | | Oil Operator | Sep 2024 |
| 30337 | Trail Mountain, Inc. | Artesia, NM 88210 | Oil & Gas Operator | Jan 2016 |
| 30338 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2025 |
| 30339 | Trail Ridge Energy PRTNS II LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jun 2017 |
| 30340 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Jan 2025 |
| 30341 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 30342 | Trailhead Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 30343 | Traillour Oil Co. | | Oil & Gas Operator | Mar 1990 |
| 30344 | Trans Atlantic Ener Corp | Caldwell, OH 43724 | Oil & Gas Operator | Dec 1993 |
| 30345 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 30346 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 30347 | Trans Ocean Oil, Inc. | Houston, TX 77252 | Oil & Gas Operator | Sep 1980 |
| 30348 | Trans Oil Marketing LLC | Abilene, TX 79608 | Oil Operator | Aug 2023 |
| 30349 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 30350 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Feb 2025 |
| 30351 | Trans Resource D | | Oil Operator | May 1991 |
| 30352 | Trans Terra Corp Int'L | Amarillo, TX 79159-0370 | Oil & Gas Operator | Jul 1993 |
| 30353 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 30354 | Trans Texas Minerals Company | Austin, TX 78714 | Oil & Gas Operator | Aug 1999 |
| 30355 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 30356 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 30357 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 30358 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 30359 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Apr 2025 |
| 30360 | Trans-Texas Energy Group LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Jul 2015 |
| 30361 | Trans-Texas Investments Inc | | Oil & Gas Operator | Aug 1995 |
| 30362 | Trans-Texas Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 1993 |
| 30363 | Trans-Western Expl. Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 30364 | Trans-Western Operating Company | Golden, CO 80402 | Oil Operator | Aug 2024 |
| 30365 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 30366 | Transamerica Energy Corp. | Atlanta, GA 30356 | Oil & Gas Operator | Apr 2025 |
| 30367 | Transamerica Oil | | Oil & Gas Operator | Sep 1992 |
| 30368 | Transamerica Oil Corporation | Hutchinson, KS 67504 | Gas Operator | Dec 2024 |
| 30369 | Transamerican Energy LTD | Dallas, TX 75231-1075 | Oil & Gas Operator | Apr 2014 |
| 30370 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 30371 | Transamerican Natural Gas Corp. | Houston, TX 77032 | Oil & Gas Operator | Aug 2000 |
| 30372 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 30373 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 30374 | Transatlantic Petr (USA) Corp. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 30375 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 30376 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 30377 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 30378 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Feb 2025 |
| 30379 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 30380 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 30381 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 30382 | Transcontinental Oil & Gas Inc | Aurora, OH 44202 | Oil & Gas Operator | Dec 2024 |
| 30383 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 30384 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 30385 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 30386 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 30387 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 30388 | Transit Energy Inc | North Lawrence, OH 44666 | Oil & Gas Operator | Dec 2024 |
| 30389 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Apr 2025 |
| 30390 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 30391 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 30392 | Transpacific Energy, LLC | Katy, TX 77450 | Oil & Gas Operator | Apr 2025 |
| 30393 | Transpetco I | Shreveport, LA 71101 | Oil & Gas Operator | May 2009 |
| 30394 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 30395 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 30396 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 30397 | Trap Rock Oil Company | Cambridge, MA 02138 | Oil & Gas Operator | Nov 2005 |
| 30398 | Trap Rock Oil, LTD. | Houston, TX 77005 | Oil & Gas Operator | Apr 2025 |
| 30399 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 30400 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |