| 4401 | Tremo Corporation | Toronto, KS 66777 | Oil Operator | May 1998 |
| 4402 | Trend Properties | Olathe, KS 66061 | Gas Operator | Dec 1996 |
| 4403 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 4404 | Tri United, Inc | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 4405 | Tri-J Tubulars, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1996 |
| 4406 | Tri-L Oil Co. | | Oil Operator | Sep 2015 |
| 4407 | Trich Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 4408 | Trigg Exploratio | | Gas Operator | Feb 1992 |
| 4409 | Triken Oil & Gas | | Oil & Gas Operator | Feb 1995 |
| 4410 | Trimble & Maclaskey Oil LLC | Gridley, KS 66852 | Oil Operator | Dec 2024 |
| 4411 | Trimble, IVal L. | Gridley, KS 66852 | Oil Operator | Dec 2019 |
| 4412 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Apr 2025 |
| 4413 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 4414 | Triple "S" Well Service, Inc. | Eureka, KS 67045 | Oil Operator | Sep 2024 |
| 4415 | Triple 'H' Oil O | | Oil Operator | Apr 1992 |
| 4416 | Triple - I, Inc. | Kansas City, MO 64114 | Gas Operator | Oct 2000 |
| 4417 | Triple B Crude, LLC | Colony, KS 66015 | Oil Operator | Nov 2024 |
| 4418 | Triple C Petroleum LLC | Colony, KS 66015 | Oil Operator | Nov 2019 |
| 4419 | Triple Crown Operating LLC | Tulsa, OK 74114 | Oil Operator | Dec 2024 |
| 4420 | Triple E Drillin | | Oil Operator | Jun 1992 |
| 4421 | Triple E Oil | Sterling, KS 67579 | Oil & Gas Operator | Mar 1999 |
| 4422 | Triple G Oilfiel | | Oil & Gas Operator | Dec 1985 |
| 4423 | Triple J L.L.C. | Coffeyville, KS 67336 | Oil Operator | Mar 1999 |
| 4424 | Triple J Prod In | | Oil Operator | Sep 1989 |
| 4425 | Triple K | | Oil Operator | Jun 2007 |
| 4426 | Triple S Construction | Blue Mound, KS 66010 | Gas Operator | Dec 2024 |
| 4427 | Triple S Well Se | | Oil Operator | Dec 1996 |
| 4428 | Triple Seven, Inc. | Oklahoma City, OK 73132 | Oil & Gas Operator | Nov 1997 |
| 4429 | Triple T Oil, LLC | Louisburg, KS 66053 | Oil Operator | Dec 2024 |
| 4430 | Triple T Pipelines, Inc. | Frontenac, KS 66763 | Oil & Gas Operator | Sep 2023 |
| 4431 | Triple T Resources, LP | Dallas, TX 75205 | Oil & Gas Operator | Dec 2024 |
| 4432 | Triple-T Pipelin | | Oil & Gas Operator | Oct 1995 |
| 4433 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2025 |
| 4434 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 4435 | Tritex Resc Inco | | Oil Operator | Dec 1985 |
| 4436 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 4437 | Triunited Investors, LLC | Monte Sereno, CA 95030 | Oil Operator | May 2012 |
| 4438 | Troy Jaco, Inc. | Sherman, TX 75091 | Oil Operator | Dec 2018 |
| 4439 | Troy Resources C | | Oil Operator | Jun 1990 |
| 4440 | Troyer, Wayne A. | Galva, KS 67443 | Oil Operator | Jun 1997 |
| 4441 | True Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 2003 |
| 4442 | Trumart Oil Comp | | Oil Operator | May 1990 |
| 4443 | Trumart Oil Company | Ellis, KS 67637 | Oil Operator | Dec 2000 |
| 4444 | Tubbs Patrick | Neodesha, KS 66757 | Oil Operator | Sep 2008 |
| 4445 | Tucker, Carl H., Jr. | Independence, KS 67301 | Oil Operator | Jul 1996 |
| 4446 | Tucker, Stephen A. | Independence, KS 67301 | Oil Operator | Feb 2009 |
| 4447 | Turnco Drilling, Inc. | Portland, OR 97208 | Oil & Gas Operator | Dec 2009 |
| 4448 | Tutcher, Dan C. | Houston, TX 77002 | Oil Operator | Dec 2004 |
| 4449 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 4450 | Twin Eagle Petro | | Oil Operator | Aug 1990 |
| 4451 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Dec 2024 |
| 4452 | Twin Star Petrol | | Oil & Gas Operator | Jan 1989 |
| 4453 | Twin Star Petroleum, Inc. | Tulsa, OK 74146 | Gas Operator | Feb 1998 |
| 4454 | Twinoco | Caney, KS 67333 | Oil Operator | Nov 1996 |
| 4455 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 4456 | TWM Production Co., A General Partnership | Chanute, KS 66720 | Oil Operator | Dec 2024 |
| 4457 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 4458 | Tyco Oil Co. | | Oil Operator | Oct 2024 |
| 4459 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 4460 | Tyco, Inc. (Colorado Corporation) | Independence, KS 67301 | Gas Operator | Jun 1998 |
| 4461 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Nov 2024 |
| 4462 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 4463 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 4464 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 4465 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 4466 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | Dec 2024 |
| 4467 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 4468 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | Dec 2024 |
| 4469 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 4470 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 4471 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 4472 | Union Pacific Resour | | Oil & Gas Operator | Apr 2002 |
| 4473 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 4474 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 4475 | Unionville Explo | | Oil Operator | Jul 1984 |
| 4476 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 4477 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2025 |
| 4478 | United Energy Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2002 |
| 4479 | United Meridian | | Oil Operator | Dec 1992 |
| 4480 | United Oil & Gas | | Oil Operator | Feb 1988 |
| 4481 | United Petroleum | | Oil Operator | Mar 1986 |
| 4482 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 |
| 4483 | United Reserve G | | Oil Operator | Aug 1987 |
| 4484 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Jun 2009 |
| 4485 | Universal Resour | | Oil & Gas Operator | Dec 1996 |
| 4486 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 4487 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 4488 | Unrein Oil Co | | Oil Operator | Dec 2024 |
| 4489 | Unruh, Elmer | Galva, KS 67443 | Oil & Gas Operator | Aug 1998 |
| 4490 | Unruh, Mark D. | Peru, KS 67360 | Oil Operator | Sep 2011 |
| 4491 | Upland Resources | | Oil Operator | Jul 1983 |
| 4492 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 4493 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 4494 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 4495 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2024 |
| 4496 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Dec 2024 |
| 4497 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 4498 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 4499 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Dec 2024 |
| 4500 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Dec 2024 |