| 30201 | TGT Petroleum Co | | Oil & Gas Operator | Apr 1995 |
| 30202 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 30203 | Thagard Trust | Rancho Santo, CA 92688 | Gas Operator | Feb 2026 |
| 30204 | Thalmann Oil Field Service, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2008 |
| 30205 | Thalmann Oilfield | Carrizo SPGS, TX 78834 | Oil Operator | Feb 2026 |
| 30206 | Thalmann, David Vac Service Inc | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Feb 2026 |
| 30207 | Tharp Oil, A General Partnership | Chanute, KS 66720 | Oil Operator | Mar 2014 |
| 30208 | Tharp Operating Company | Houston, TX 77070 | Oil & Gas Operator | Nov 2014 |
| 30209 | Thaxton Operating | | Oil Operator | Jan 1994 |
| 30210 | Thayer Donald D | Labarge, WY 83123 | Oil & Gas Operator | Jan 2015 |
| 30211 | Thayer Exploration Company | Wetumka, OK 74883 | Gas Operator | Dec 1996 |
| 30212 | The A I Root Company | Medina, OH 44256 | Gas Operator | Dec 2024 |
| 30213 | The Arvin Company | | Oil Operator | Dec 2004 |
| 30214 | The B&B Oil Co Of Sabine Inc | | Oil Operator | Jun 1982 |
| 30215 | The B&C Corp-Imp Amer MGT Co | | Oil & Gas Operator | Aug 1981 |
| 30216 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 30217 | The Bering Company | | Oil Operator | Jul 1979 |
| 30218 | The Bill Bowman Oil Company | | Oil Operator | Sep 2025 |
| 30219 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 30220 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 30221 | The Carroll Rod & Gun Club, Inc. Of Frewsburg, Ny | Frewsburg, NY 14738 | Oil & Gas Operator | Dec 2024 |
| 30222 | The Colborn Company, Inc. | Eunice, NM 88231 | Oil & Gas Operator | Jun 2025 |
| 30223 | The Cornell Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 1993 |
| 30224 | The Dehart Company LLC | Ardmore, OK 73402-0907 | Oil Operator | Nov 2025 |
| 30225 | The Edward H Everett Company | Newark, OH 43055 | Oil & Gas Operator | Dec 2024 |
| 30226 | The Elliott Oil Corporation | | Oil & Gas Operator | Nov 2025 |
| 30227 | The Exploration Co. Of La, Inc | | Oil & Gas Operator | Nov 1987 |
| 30228 | The Galaxy Corporation | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2025 |
| 30229 | The Gas & Oil Company LLC | Apollo, PA 15613 | Oil & Gas Operator | Dec 2025 |
| 30230 | The George R Brown Partnership | | Oil & Gas Operator | Jun 1992 |
| 30231 | The Gerry Homes | Gerry, NY 14740 | Gas Operator | Dec 2024 |
| 30232 | The Glass Development Company | St. Marys, WV 26170-0000 | Oil & Gas Operator | Dec 2021 |
| 30233 | The Goro Corporation | | Oil & Gas Operator | Jul 1978 |
| 30234 | The Grapes Of Ross, LLC | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 30235 | The Guinn Company LLC | Asher, OK 74826-6012 | Oil & Gas Operator | Sep 2025 |
| 30236 | The Hampton Oil Corporation | | Oil & Gas Operator | Aug 2014 |
| 30237 | The Harter Family Trust Of 1995 | | Oil Operator | Dec 2003 |
| 30238 | The Harvest Group, LLC | | Oil & Gas Operator | May 2011 |
| 30239 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 30240 | The Krik Company | | Oil Operator | Dec 2004 |
| 30241 | The KT Oil Company LLC | Ada, OK 74820 | Oil & Gas Operator | Nov 2025 |
| 30242 | The Lansdale Co. | | Oil & Gas Operator | Dec 2025 |
| 30243 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 30244 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 30245 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 30246 | The Nahabedian Exploration Group LLC | | Oil & Gas Operator | Nov 2025 |
| 30247 | The Ny Conf. Assoc. Of Seventh-Day Adventists | Syracuse, NY 13215 | Gas Operator | Dec 2024 |
| 30248 | The Ohio Oil Company | | Oil Operator | Jan 2025 |
| 30249 | The Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2007 |
| 30250 | The Ozark Corp. | | Oil Operator | Apr 1970 |
| 30251 | The Pioneer | | Gas Operator | Feb 2008 |
| 30252 | The Port Of Long Beach | | Oil & Gas Operator | Dec 1997 |
| 30253 | The Procter And Gamble Co. | | Gas Operator | Dec 1989 |
| 30254 | The Production Co | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2012 |
| 30255 | The Production Co LLC | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2020 |
| 30256 | The Pyramid Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2009 |
| 30257 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Dec 2025 |
| 30258 | The Raven Company LLC | Granbury, TX 76049 | Oil Operator | Mar 2010 |
| 30259 | The Richardson Petroleum Corporation | Whitesville, NY 14897 | Oil & Gas Operator | Dec 2024 |
| 30260 | The Robert And Donna Harwood Income Only Trust | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 30261 | The Romanoff Corporation | | Oil & Gas Operator | Nov 1989 |
| 30262 | The Southern Louisiana Expl. Company LLC | | Oil & Gas Operator | Nov 2024 |
| 30263 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 30264 | The Stone Petro Corp-Toce Oil | | Oil & Gas Operator | Oct 1984 |
| 30265 | The Superior Oc WM Scully Etal | | Oil & Gas Operator | Apr 1986 |
| 30266 | The Superior Oil Co & Pel-Tex | | Oil & Gas Operator | Apr 1986 |
| 30267 | The Superior Oil Co - Tesoro | | Oil & Gas Operator | Apr 1986 |
| 30268 | The Sylvester Oil Co, LLC | League City, TX 77573 | Oil Operator | Aug 2025 |
| 30269 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Dec 2025 |
| 30270 | The Texas Company | FT Worth, TX 76101 | Oil & Gas Operator | Dec 2013 |
| 30271 | The Trees Oil Company | Wichita, KS 67208 | Oil & Gas Operator | Nov 2014 |
| 30272 | The Twenty Eleven Corp Inc | Ada, OK 74820-3605 | Oil Operator | Nov 2025 |
| 30273 | The William R Earnhardt Company | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 30274 | The WM G Helis Company, L.L.C. | | Oil & Gas Operator | Nov 2003 |
| 30275 | The Woods Parcel, LLC | Orchard Park, NY 14127 | Gas Operator | Dec 2024 |
| 30276 | Theisen, VIncent A. | Wilmington, DE 19807 | Oil & Gas Operator | Sep 2003 |
| 30277 | Theodore W Ochs | Lucinda, PA 16235-3517 | Gas Operator | Dec 2009 |
| 30278 | Thigpin Operating, LLC | Odessa, TX 79762 | Oil Operator | Feb 2026 |
| 30279 | Third Coast Energy, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Feb 2026 |
| 30280 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 30281 | Thomas A. Blanton | | Oil Operator | Oct 2025 |
| 30282 | Thomas Aitken, Inc. | | Gas Operator | Dec 2024 |
| 30283 | Thomas And Ruby Parkinson Trust | Tatum, NM 88267 | Oil & Gas Operator | Dec 2025 |
| 30284 | Thomas B Rixleben | | Oil & Gas Operator | Jul 2008 |
| 30285 | Thomas Bell | | Oil Operator | Dec 1985 |
| 30286 | Thomas C. Hoffpauir | | Oil & Gas Operator | Mar 1991 |
| 30287 | Thomas C. Hoffpauir, Inc. | | Oil & Gas Operator | Jan 1981 |
| 30288 | Thomas C. King | | Oil & Gas Operator | Dec 1995 |
| 30289 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 30290 | Thomas E. Slack | | Oil Operator | Mar 2003 |
| 30291 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | Feb 2026 |
| 30292 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Nov 2025 |
| 30293 | Thomas G. Easterling | | Oil Operator | Jun 1989 |
| 30294 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Sep 2025 |
| 30295 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 30296 | Thomas L Spring LLC | | Gas Operator | Dec 2025 |
| 30297 | Thomas M. Brown LLC | Plainville, KS 67663 | Oil Operator | Sep 2025 |
| 30298 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 30299 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 30300 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |