| 4501 | Toshic Dynamics, LLC | Scottsdale, AZ 85251 | Oil Operator | Nov 2006 |
| 4502 | Toto Energy, LLC | Spring, TX 77380 | Oil & Gas Operator | Dec 2019 |
| 4503 | Totten Resources | | Oil Operator | Sep 2007 |
| 4504 | Touchstone Trading & Transportation Inc | | Oil Operator | Mar 2025 |
| 4505 | Tower Oil & Gas Company Inc | Englewood, CO 80111 | Oil & Gas Operator | May 2001 |
| 4506 | Town Oil Co. | Paola, KS 66071 | Oil & Gas Operator | Aug 2025 |
| 4507 | Townes, Don | Clarksville, TX 75426 | Oil & Gas Operator | Feb 2026 |
| 4508 | TPC, Inc. | Manhattan, KS 66502 | Oil & Gas Operator | Sep 1997 |
| 4509 | TR Crude LLC | Independence, KS 67301 | Oil Operator | Aug 2024 |
| 4510 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 4511 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 4512 | Trans Resource D | | Oil Operator | May 1991 |
| 4513 | Trans-Western Operating Company | Golden, CO 80402 | Oil Operator | Jun 2025 |
| 4514 | Transamerica Oil | | Oil & Gas Operator | Sep 1992 |
| 4515 | Transamerica Oil Corporation | Hutchinson, KS 67504 | Gas Operator | Mar 2025 |
| 4516 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 4517 | Trees Oil Compan | | Oil Operator | Jan 1995 |
| 4518 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 4519 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 4520 | Tremo Corporation | Toronto, KS 66777 | Oil Operator | May 1998 |
| 4521 | Trend Properties | Olathe, KS 66061 | Gas Operator | Dec 1996 |
| 4522 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Nov 2025 |
| 4523 | Tri United, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 4524 | Tri-J Tubulars, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1996 |
| 4525 | Tri-L Oil Co. | | Oil Operator | Sep 2015 |
| 4526 | Triad Drilling C | | Oil & Gas Operator | Nov 1988 |
| 4527 | Trich Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 4528 | Trigg Exploratio | | Gas Operator | Feb 1992 |
| 4529 | Triken Oil & Gas | | Oil & Gas Operator | Feb 1995 |
| 4530 | Triken Oil & Gas, Inc. | Bellingham, WA 98225 | Gas Operator | Dec 1996 |
| 4531 | Trimble & Maclaskey Oil LLC | Gridley, KS 66852 | Oil Operator | Sep 2025 |
| 4532 | Trimble, IVal L. | Gridley, KS 66852 | Oil Operator | Dec 2019 |
| 4533 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Feb 2026 |
| 4534 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 4535 | Triple "S" Well Service, Inc. | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 4536 | Triple 'H' Oil O | | Oil Operator | Apr 1992 |
| 4537 | Triple - I, Inc. | Kansas City, MO 64114 | Gas Operator | Oct 2000 |
| 4538 | Triple B Crude, LLC | Colony, KS 66015 | Oil Operator | Sep 2025 |
| 4539 | Triple C Petroleum LLC | Colony, KS 66015 | Oil Operator | Nov 2019 |
| 4540 | Triple Crown Operating LLC | Tulsa, OK 74114 | Oil Operator | Sep 2025 |
| 4541 | Triple E Drillin | | Oil Operator | Jun 1992 |
| 4542 | Triple E Oil | Sterling, KS 67579 | Oil & Gas Operator | Mar 1999 |
| 4543 | Triple G Oilfiel | | Oil & Gas Operator | Dec 1985 |
| 4544 | Triple J L.L.C. | Coffeyville, KS 67336 | Oil Operator | Mar 1999 |
| 4545 | Triple J Prod In | | Oil Operator | Sep 1989 |
| 4546 | Triple K | | Oil Operator | Jun 2007 |
| 4547 | Triple S Construction | Blue Mound, KS 66010 | Gas Operator | Sep 2025 |
| 4548 | Triple S Well Se | | Oil Operator | Dec 1996 |
| 4549 | Triple Seven, Inc. | Oklahoma City, OK 73132 | Oil & Gas Operator | Nov 1997 |
| 4550 | Triple T Oil, LLC | Louisburg, KS 66053 | Oil Operator | Aug 2025 |
| 4551 | Triple T Pipelines, Inc. | Frontenac, KS 66763 | Oil & Gas Operator | Sep 2023 |
| 4552 | Triple T Resources, LP | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |
| 4553 | Triple-T Pipelin | | Oil & Gas Operator | Oct 1995 |
| 4554 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2026 |
| 4555 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 4556 | Tristar Producer Ser | | Gas Operator | Jan 2009 |
| 4557 | Tritex Resc Inco | | Oil Operator | Dec 1985 |
| 4558 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 4559 | Triunited Investors, LLC | Monte Sereno, CA 95030 | Oil Operator | May 2012 |
| 4560 | Troy Jaco, Inc. | Sherman, TX 75091 | Oil Operator | Dec 2018 |
| 4561 | Troy Resources C | | Oil Operator | Jun 1990 |
| 4562 | Troyer, Wayne A. | Galva, KS 67443 | Oil Operator | Jun 1997 |
| 4563 | True Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 2003 |
| 4564 | Trumart Oil Comp | | Oil Operator | May 1990 |
| 4565 | Trumart Oil Company | Ellis, KS 67637 | Oil Operator | Dec 2000 |
| 4566 | Tubbs Patrick | Neodesha, KS 66757 | Oil Operator | Sep 2008 |
| 4567 | Tucker Prod Corp | | Oil & Gas Operator | Dec 1985 |
| 4568 | Tucker, Carl H., Jr. | Independence, KS 67301 | Oil Operator | Jul 1996 |
| 4569 | Tucker, Stephen A. | Independence, KS 67301 | Oil Operator | Feb 2009 |
| 4570 | Turnco Drilling, Inc. | Portland, OR 97208 | Oil & Gas Operator | Dec 2009 |
| 4571 | Tutcher, Dan C. | Houston, TX 77002 | Oil Operator | Dec 2004 |
| 4572 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 4573 | Twin Eagle Petro | | Oil Operator | Aug 1990 |
| 4574 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Sep 2025 |
| 4575 | Twin Star Petrol | | Oil & Gas Operator | Jan 1989 |
| 4576 | Twin Star Petroleum, Inc. | Tulsa, OK 74146 | Gas Operator | Feb 1998 |
| 4577 | Twin Valley Enterprises, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 2013 |
| 4578 | Twinoco | Caney, KS 67333 | Oil Operator | Nov 1996 |
| 4579 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 4580 | TWM Production Co., A General Partnership | Chanute, KS 66720 | Oil Operator | May 2025 |
| 4581 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 4582 | Tyco Oil Co. | | Oil Operator | Jul 2025 |
| 4583 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 4584 | Tyco, Inc. (Colorado Corporation) | Independence, KS 67301 | Gas Operator | Jun 1998 |
| 4585 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 4586 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 4587 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 4588 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 4589 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 4590 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | Jul 2025 |
| 4591 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 4592 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | Sep 2025 |
| 4593 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 4594 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 4595 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 4596 | Union Pacific Resour | | Oil & Gas Operator | Apr 2002 |
| 4597 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 4598 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | Dec 2025 |
| 4599 | Unionville Explo | | Oil Operator | Jul 1984 |
| 4600 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2026 |