| 31301 | TX Enhanced Oil Recovery Co, LLC | Sealy, TX 77474 | Oil & Gas Operator | Feb 2026 |
| 31302 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 31303 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Feb 2026 |
| 31304 | TX Meridian Opr Co Inc | Houston, TX 77079-2461 | Gas Operator | Dec 1989 |
| 31305 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 31306 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Feb 2026 |
| 31307 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Feb 2026 |
| 31308 | Txo Prod Corp.-Arkla Expl. Co. | | Oil & Gas Operator | Dec 1990 |
| 31309 | Txo Producing Properties Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 1993 |
| 31310 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 31311 | Txo Production Corp/Amh O&G Co | | Oil & Gas Operator | Dec 1990 |
| 31312 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 31313 | Txok Texas Energy Resources,L.P. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2008 |
| 31314 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 31315 | TXP Operating Co. | | Oil & Gas Operator | Jul 1992 |
| 31316 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 31317 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 31318 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 31319 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 31320 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Feb 2026 |
| 31321 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 31322 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 31323 | Tyco Oil Co. | | Oil Operator | Jul 2025 |
| 31324 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 31325 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 31326 | Tyco, Inc. (Colorado Corporation) | Independence, KS 67301 | Gas Operator | Jun 1998 |
| 31327 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 31328 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 31329 | Tyler Enterprises Inc | Bristow, OK 74010-3192 | Oil & Gas Operator | Feb 2004 |
| 31330 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 31331 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 31332 | Tyler Production, LLC | | Oil & Gas Operator | Jul 2013 |
| 31333 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2025 |
| 31334 | Tyler, Scott A | | Oil & Gas Operator | Nov 2025 |
| 31335 | Tyler, Steven Lee | | Oil Operator | May 2014 |
| 31336 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 31337 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Feb 2026 |
| 31338 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 31339 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 31340 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 31341 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 31342 | Tyson Gary | Hobart, OK 73651-6413 | Oil & Gas Operator | Mar 2018 |
| 31343 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 31344 | Tyson Olan | Hobart, OK 73651-6413 | Oil & Gas Operator | Apr 2015 |
| 31345 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 31346 | U Bee Tea Production LLC | Culbertson, MT 59218 | Oil & Gas Operator | Oct 2025 |
| 31347 | U R C C | | Oil & Gas Operator | Jun 1991 |
| 31348 | U S Drilling Company Inc | Holdenville, OK 74848-0913 | Oil & Gas Operator | Mar 2017 |
| 31349 | U S Energy Corp. Of Amer. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 31350 | U S Exploraton Liq Trust | | Oil & Gas Operator | Oct 1994 |
| 31351 | U S Fuel Develop Co Inc | Columbus, OH 43216-6421 | Oil & Gas Operator | Dec 1984 |
| 31352 | U S Liquids Of La., L.P. | | Oil Operator | Apr 2014 |
| 31353 | U V Industries | | Oil & Gas Operator | Jan 1993 |
| 31354 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 31355 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 31356 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 31357 | U. O. C., Inc. | | Oil Operator | Jun 2019 |
| 31358 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Feb 2026 |
| 31359 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 31360 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |
| 31361 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 31362 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 31363 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 31364 | U.S. Oil Reclaimers, LLC | | Oil Operator | Jun 2023 |
| 31365 | U.S. Sovereign Oil And Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Feb 2026 |
| 31366 | U.S. Steel Mining Co., Inc. | | Gas Operator | Jan 2000 |
| 31367 | U.S. Steel Mining Co., LLC | | Gas Operator | Oct 2002 |
| 31368 | U.S.A. Plugging Company | Pearsall, TX 78061 | Oil & Gas Operator | Feb 2026 |
| 31369 | U1 Ranch Oil | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 31370 | Uae Investco 1 (Estill), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2022 |
| 31371 | Uae Investco 2 (Lee), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2021 |
| 31372 | Ubetco, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Feb 2026 |
| 31373 | Uebelhor, Theodore | | Oil Operator | Dec 2023 |
| 31374 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | Jul 2025 |
| 31375 | Uhc New Mexico Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2007 |
| 31376 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Feb 2026 |
| 31377 | Uhl Oil Co., Inc. | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 31378 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 31379 | Uinta Oil & Gas | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 1997 |
| 31380 | Uinta Wax Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2025 |
| 31381 | Uintah Investors LLC | Vernal, UT 84078 | Oil & Gas Operator | Dec 2025 |
| 31382 | Ulatex Oil & Gas Inc. | Nocona, TX 76255 | Oil & Gas Operator | Dec 1998 |
| 31383 | Ullrich Sandy J | Haskell, OK 74436 | Oil Operator | Nov 2025 |
| 31384 | Ulrich, William J., Jr. & Connie K. | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 31385 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Feb 2026 |
| 31386 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 31387 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 31388 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 31389 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 31390 | Ultramar Production Company | | Oil & Gas Operator | Dec 1991 |
| 31391 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | Sep 2025 |
| 31392 | Umad LLC | | Oil & Gas Operator | Feb 2010 |
| 31393 | Umberham Oil Company Inc | Oklahoma City, OK 73151-4000 | Oil & Gas Operator | Dec 2025 |
| 31394 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 31395 | Umma Resources, LLC | Portland, TX 78374 | Gas Operator | Feb 2026 |
| 31396 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 31397 | Unbridled Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 31398 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 31399 | Underground Energy Inc. | | Oil & Gas Operator | Nov 2025 |
| 31400 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Dec 2025 |