| 4201 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 4202 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 4203 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 4204 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 4205 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 4206 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 4207 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 4208 | T.J. Oil | | Oil Operator | Oct 2024 |
| 4209 | Taft Oil And Gas LLC | Bonham, TX 75418 | Oil & Gas Operator | Dec 2018 |
| 4210 | Tailwater, Inc. | Oklahoma City, OK 73154 | Oil Operator | Aug 2024 |
| 4211 | Talley Resources | | Oil Operator | Jun 1994 |
| 4212 | Tallgrass Explor | | Oil Operator | Sep 1987 |
| 4213 | Talon Group LLC | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 4214 | Tamoil | | Oil Operator | May 2017 |
| 4215 | Tanner, M.B. | Moline, KS 67353 | Oil Operator | Apr 1986 |
| 4216 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 4217 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 4218 | Targa Pipeline Mid-Continent Westok LLC | Sulphur, LA 70665 | Gas Operator | Mar 2025 |
| 4219 | Tate Exploration | Lakin, KS 67860 | Oil & Gas Operator | Sep 1994 |
| 4220 | Taurus Oil Compa | | Oil Operator | Oct 1994 |
| 4221 | Tauy Oil, Inc | Baldwin City, KS 66006 | Oil Operator | Mar 2025 |
| 4222 | Taylor Explorati | | Oil & Gas Operator | Jun 1985 |
| 4223 | Taylor Florence | | Oil Operator | Mar 1995 |
| 4224 | Taylor Oil Co. | Edmond, OK 73034 | Oil & Gas Operator | Mar 2025 |
| 4225 | Taylor-Brown Ope | | Oil Operator | Sep 1988 |
| 4226 | Taylor-Cranor Oi | | Oil Operator | Dec 1987 |
| 4227 | Tdi, Inc. | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 4228 | Tdot Oil, Inc. | Sedan, KS 67361 | Oil Operator | Mar 2025 |
| 4229 | TDR Construction, Inc. | Wellsville, KS 66092 | Oil Operator | Mar 2025 |
| 4230 | Te-Pe Oil & Gas | | Oil & Gas Operator | Mar 2025 |
| 4231 | Te-Ray Energy, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Apr 2025 |
| 4232 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 4233 | Tec Drilling Com | | Oil Operator | Feb 1982 |
| 4234 | Tec Resources, L.L.C. | Tulsa, OK 74128 | Oil & Gas Operator | May 2013 |
| 4235 | Tech American Re | | Oil Operator | Sep 1985 |
| 4236 | Teg Midcontinent, Inc. | Aurora, CO 80014 | Oil Operator | Jul 2013 |
| 4237 | Tehi Illinois, LLC | Olney, IL 62450 | Oil & Gas Operator | Feb 2019 |
| 4238 | Teichgraeber Oil | | Oil Operator | Nov 1995 |
| 4239 | Teichgraeber Oil Co. | | Oil Operator | Dec 1994 |
| 4240 | Teichgraeber Oil, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Dec 2024 |
| 4241 | Tekenergy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 4242 | Teko Oil & Gas I | | Oil Operator | Aug 1992 |
| 4243 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 4244 | Tema Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2009 |
| 4245 | Tenex Oil Corpor | | Oil Operator | May 1991 |
| 4246 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 4247 | Tenison Oil Comp | | Oil Operator | Jan 1993 |
| 4248 | Tenk, Lawrence O. | Ottawa, KS 66067 | Oil & Gas Operator | Oct 1998 |
| 4249 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 4250 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Apr 2025 |
| 4251 | Terra Max Energy | | Oil Operator | Mar 1986 |
| 4252 | Terra Resc Incor | | Oil Operator | Mar 1986 |
| 4253 | Terrol Energy In | | Oil Operator | Feb 1993 |
| 4254 | Terrol Energy, Inc. | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 4255 | Tesoro Petroleum | | Oil Operator | Mar 1982 |
| 4256 | Tet Energy | | Oil Operator | Mar 2025 |
| 4257 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | May 2025 |
| 4258 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 4259 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 4260 | Texaco USA - Mor | | Oil Operator | Aug 1988 |
| 4261 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 4262 | Texas Energies, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 4263 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 4264 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 4265 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |
| 4266 | Texkan Resources, LLC | Odessa, TX 79765 | Oil & Gas Operator | Dec 2019 |
| 4267 | Texokan Energy C | | Oil Operator | Nov 1986 |
| 4268 | Texokan Resources, Inc. | Dallas, TX 75206 | Oil Operator | Apr 2012 |
| 4269 | TGT Petroleum Co | | Oil & Gas Operator | Apr 1995 |
| 4270 | TGT Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Mar 2025 |
| 4271 | Tharp Oil, A General Partnership | Chanute, KS 66720 | Oil Operator | Mar 2014 |
| 4272 | The Bill Bowman Oil Company | | Oil Operator | Mar 2025 |
| 4273 | The Gary-Williams Company | Denver, CO 80202 | Oil Operator | Nov 2009 |
| 4274 | The Pyramid Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2009 |
| 4275 | The Raven Company LLC | Granbury, TX 76049 | Oil Operator | Mar 2010 |
| 4276 | The Trees Oil Company | Wichita, KS 67208 | Oil & Gas Operator | Nov 2014 |
| 4277 | The Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 4278 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Apr 2025 |
| 4279 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Mar 2025 |
| 4280 | Thomas M. Brown LLC | Plainville, KS 67663 | Oil Operator | Mar 2025 |
| 4281 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 4282 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Mar 2025 |
| 4283 | Thomas, Vernon C. | Gardner, KS 66030 | Oil Operator | Jun 2015 |
| 4284 | Thomason Oil Com | | Oil Operator | Oct 1984 |
| 4285 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 4286 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 4287 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Apr 2025 |
| 4288 | Thompson, Don W | Herington, KS 67449 | Oil Operator | Jul 2003 |
| 4289 | Thompson, Larry N. Revocable Trust, Uid 5-20, 1997 | Elkhart, KS 67950 | Gas Operator | Sep 2006 |
| 4290 | Thomsen Brothers Co., LLC | Lamont, KS 66855 | Oil Operator | Mar 2025 |
| 4291 | Thornberry Family Partnership LTD. | New Waverly, TX 77358 | Oil Operator | Mar 2025 |
| 4292 | Thorne Harold & | | Oil Operator | May 1994 |
| 4293 | Thornton Drilling Company Ptrnship | Eureka, KS 67045 | Oil Operator | Jun 2010 |
| 4294 | Thornton Oil Co. | Abilene, TX 79603 | Oil & Gas Operator | Aug 2003 |
| 4295 | Thoroughbred Associates L.L.C. | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 4296 | Three Bros. Energy, Inc. | Ponca City, OK 74601 | Gas Operator | Dec 2013 |
| 4297 | Three D Oil Comp | | Oil & Gas Operator | Jan 1988 |
| 4298 | Three Rivers Exploration LLC | Olpe, KS 66865 | Oil Operator | Sep 2023 |
| 4299 | Three-D Resources, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Mar 2025 |
| 4300 | Thresher Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jul 2025 |