| 4401 | Tutcher, Dan C. | Houston, TX 77002 | Oil Operator | Dec 2004 |
| 4402 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 4403 | Twin Eagle Petro | | Oil Operator | Aug 1990 |
| 4404 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Mar 2025 |
| 4405 | Twin Star Petrol | | Oil & Gas Operator | Jan 1989 |
| 4406 | Twinoco | Caney, KS 67333 | Oil Operator | Nov 1996 |
| 4407 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 4408 | TWM Production Co., A General Partnership | Chanute, KS 66720 | Oil Operator | Dec 2024 |
| 4409 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 4410 | Tyco Oil Co. | | Oil Operator | Jan 2025 |
| 4411 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 4412 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Nov 2024 |
| 4413 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 4414 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 4415 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 4416 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 4417 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | Dec 2024 |
| 4418 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 4419 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | Mar 2025 |
| 4420 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 4421 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 4422 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 4423 | Union Pacific Resour | | Oil & Gas Operator | Apr 2002 |
| 4424 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 4425 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | May 2025 |
| 4426 | Unionville Explo | | Oil Operator | Jul 1984 |
| 4427 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 4428 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Apr 2025 |
| 4429 | United Energy Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2002 |
| 4430 | United Meridian | | Oil Operator | Dec 1992 |
| 4431 | United Oil & Gas | | Oil Operator | Feb 1988 |
| 4432 | United Petroleum | | Oil Operator | Mar 1986 |
| 4433 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 |
| 4434 | United Reserve G | | Oil Operator | Aug 1987 |
| 4435 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Jun 2009 |
| 4436 | Universal Resour | | Oil & Gas Operator | Dec 1996 |
| 4437 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 4438 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 4439 | Unrein Oil Co | | Oil Operator | Mar 2025 |
| 4440 | Unruh, Elmer | Galva, KS 67443 | Oil & Gas Operator | Aug 1998 |
| 4441 | Unruh, Mark D. | Peru, KS 67360 | Oil Operator | Sep 2011 |
| 4442 | Upland Resources | | Oil Operator | Jul 1983 |
| 4443 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 4444 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 4445 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 4446 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Mar 2025 |
| 4447 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Mar 2025 |
| 4448 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 4449 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 4450 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Mar 2025 |
| 4451 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 4452 | V & R Oil | | Oil Operator | Mar 2025 |
| 4453 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | Mar 2025 |
| 4454 | V. R. Oil Co. | | Oil Operator | Mar 2025 |
| 4455 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 4456 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 4457 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 4458 | Vamco Operations | | Oil & Gas Operator | Mar 2025 |
| 4459 | Van Buskirk Bill | | Oil Operator | Dec 1996 |
| 4460 | Van Buskirk, Billy L. | Severy, KS 67137 | Oil Operator | Dec 2009 |
| 4461 | Van Oil, Inc | Madison, KS 66860 | Oil & Gas Operator | Jan 2025 |
| 4462 | Vanderman Oil | Neosho Falls, KS 66758 | Oil Operator | Feb 2006 |
| 4463 | Vanmax Explorati | | Oil Operator | Nov 1995 |
| 4464 | Vanon Energy Inc | Fort Worth, TX 76162 | Oil & Gas Operator | Jul 2022 |
| 4465 | Vanroyen Oil And Gas, L.L.C. | Wichita, KS 67217 | Oil Operator | Mar 2025 |
| 4466 | Vantage Petroleum, Inc. | Olmitz, KS 67564 | Oil Operator | May 2008 |
| 4467 | Vast Petroleum Corporation | Highland, UT 84003 | Oil Operator | Jan 2016 |
| 4468 | Vast Petroleum Of Kansas LLC | Bozeman, MT 59715 | Oil Operator | Dec 2009 |
| 4469 | Vastar Resources | | Oil & Gas Operator | Dec 1996 |
| 4470 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Mar 2025 |
| 4471 | Vaughn Good Oil Co. | | Gas Operator | Mar 2025 |
| 4472 | Vci Production | Jarales, NM 87023 | Oil Operator | Jan 1997 |
| 4473 | Veale Donald K & | | Oil Operator | Oct 1985 |
| 4474 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | May 2025 |
| 4475 | Veem Jade Oil & Gas LLC | Plano, TX 75093 | Oil Operator | Aug 2024 |
| 4476 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2025 |
| 4477 | Venture Independent Petroleum, LLC | Llaves, NM 87027 | Oil Operator | Nov 2011 |
| 4478 | Venture Oil Comp | | Oil Operator | Aug 1988 |
| 4479 | Venture Production, Inc. | Mulvane, KS 67110 | Oil Operator | Jul 1998 |
| 4480 | Venture Resources | Denver, CO 80202 | Oil Operator | Dec 1993 |
| 4481 | Venture Resources, Inc. | Denver, CO 80250 | Oil Operator | Mar 2025 |
| 4482 | Venus Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 4483 | Vera Cruz Petrol | | Oil & Gas Operator | Oct 1989 |
| 4484 | Verde Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 4485 | Verde Operating Company | Littleton, CO 80122 | Gas Operator | Mar 2025 |
| 4486 | Verdigris Energy | | Gas Operator | Jun 1983 |
| 4487 | Vern Jones Oil & Gas Corp. | Sacramento, CA 95825 | Oil & Gas Operator | Apr 2025 |
| 4488 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 4489 | Vess Transpacifi | | Oil & Gas Operator | Jul 1995 |
| 4490 | Vess-Transpacific Operating Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | May 2024 |
| 4491 | Vestal, Jack L. | Longton, KS 67352 | Gas Operator | Mar 1998 |
| 4492 | Viable Resources | | Oil Operator | Dec 1984 |
| 4493 | Vickers Farms Oil Venture, A General Partnership | Ottawa, KS 66067 | Oil Operator | Sep 2024 |
| 4494 | Vickers, Jerry L. | Ottawa, KS 66067 | Oil Operator | Sep 2024 |
| 4495 | Vicorp Energy In | | Oil Operator | Apr 1988 |
| 4496 | Victory Minerals LLC | Kansas City, MO 64141 | Oil Operator | Mar 2025 |
| 4497 | Victory Operating, Inc. | Andover, KS 67002 | Oil & Gas Operator | Mar 2025 |
| 4498 | Viking Internati | | Gas Operator | Jan 1988 |
| 4499 | Viking Petroleum | | Oil Operator | Mar 1990 |
| 4500 | Viking Production LLC | Fredonia, KS 66736 | Oil Operator | Mar 2016 |