| 6401 | Tru Operating LLC | Denton, TX 76201 | Oil & Gas Operator | Apr 2023 |
| 6402 | Truckers Disposal Inc | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2025 |
| 6403 | True Performance Administrators LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jan 2025 |
| 6404 | Trueblood Resources, Inc. | Denver, CO 80222 | Oil & Gas Operator | Apr 2025 |
| 6405 | Truevine Gas Company | Ada, OK 74821-1422 | Oil & Gas Operator | Jan 2025 |
| 6406 | Truevine Operating LLC | Ada, OK 74821-1422 | Oil & Gas Operator | Jan 2025 |
| 6407 | Truluck Enterprises LLC | Wichita Falls, TX 76308-4454 | Oil & Gas Operator | Apr 2015 |
| 6408 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 6409 | Tsalta Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 1998 |
| 6410 | Tucker Gary & Deedee | Jennings, OK 74038 | Oil & Gas Operator | Oct 2024 |
| 6411 | Tucker Ron & Co | Norman, OK 73069-8511 | Gas Operator | Sep 2017 |
| 6412 | Tucker Tim | Hominy, OK 74035 | Oil Operator | Jan 2025 |
| 6413 | Tucson Oil & Gas Inc | | Oil & Gas Operator | Aug 1994 |
| 6414 | Tulsa Energy Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2013 |
| 6415 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Feb 2025 |
| 6416 | Tulsa Minerals Inc | Tulsa, OK 74136-1045 | Oil & Gas Operator | May 2013 |
| 6417 | Tulum Corporation | Oklahoma City, OK 73101-0125 | Oil & Gas Operator | Jan 2025 |
| 6418 | Turnbow John R Company | Tulsa, OK 74120-2420 | Oil & Gas Operator | Aug 2006 |
| 6419 | Turner Jeff | Marlow, OK 73055 | Oil & Gas Operator | Apr 2007 |
| 6420 | Turner John O | Drumright, OK 74030-1216 | Oil & Gas Operator | Feb 1998 |
| 6421 | Turner Oil Company | Yale, OK 74085-0234 | Oil & Gas Operator | Nov 2014 |
| 6422 | Turner Randall L | Duncan, OK 73533-4826 | Oil Operator | Feb 2025 |
| 6423 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 6424 | Turntable Energy Inc | Ponca City, OK 74604 | Oil & Gas Operator | Jan 2025 |
| 6425 | Turpin Ledon Production | Ada, OK 74820-0549 | Oil Operator | Jan 2025 |
| 6426 | Tuscany Operating LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2014 |
| 6427 | Tuthill S Keith & Bill Barbee | Amarillo, TX 79101-1427 | Oil & Gas Operator | Dec 2004 |
| 6428 | Twenty First Century Res Inc | Lajolla, CA 92037-7044 | Oil & Gas Operator | Mar 2015 |
| 6429 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 6430 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Apr 2025 |
| 6431 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 6432 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 6433 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Feb 2025 |
| 6434 | Two Gems Company | McAlester, OK 74502-1996 | Oil & Gas Operator | Jan 2025 |
| 6435 | Two Pines | Drumright, OK 74030-5502 | Oil & Gas Operator | Feb 2012 |
| 6436 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 6437 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 6438 | Tyler Enterprises Inc | Bristow, OK 74010-3192 | Oil & Gas Operator | Feb 2004 |
| 6439 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 6440 | Tyson Gary | Hobart, OK 73651-6413 | Oil & Gas Operator | Mar 2018 |
| 6441 | Tyson Olan | Hobart, OK 73651-6413 | Oil & Gas Operator | Apr 2015 |
| 6442 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 6443 | U S Drilling Company Inc | Holdenville, OK 74848-0913 | Oil & Gas Operator | Mar 2017 |
| 6444 | U S Oil Reclaimers LLC | Drumright, OK 74030-1155 | Oil Operator | Jun 2023 |
| 6445 | U.S. Energy Development Corp | Fort Worth, TX 76164 | Oil & Gas Operator | Apr 2025 |
| 6446 | Ullrich Sandy J | Haskell, OK 74436 | Oil Operator | Jan 2025 |
| 6447 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 6448 | Umberham Oil Company Inc | Oklahoma City, OK 73151-4000 | Oil & Gas Operator | Feb 2025 |
| 6449 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 6450 | Unbridled Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 6451 | Underwood Oil And Gas LLC | Chandler, OK 74834-1414 | Oil & Gas Operator | Feb 2025 |
| 6452 | Unicon Producing Company | Houston, TX 75252 | Gas Operator | Mar 1994 |
| 6453 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 6454 | Union Resources Inc | | Oil & Gas Operator | Dec 1996 |
| 6455 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 6456 | Union Texas Products Corp | Houston, TX 77252 | Oil & Gas Operator | Nov 1994 |
| 6457 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 6458 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Jan 2025 |
| 6459 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 6460 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Jan 2025 |
| 6461 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2025 |
| 6462 | United Energy Develop Co LTD | Bartlesville, OK 74003 | Oil Operator | Mar 2004 |
| 6463 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 6464 | United Energy Trading LLC | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2025 |
| 6465 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Jan 2025 |
| 6466 | United Primary Resources Inc | Milton, WA 98354-9361 | Oil & Gas Operator | Feb 2016 |
| 6467 | United Producers Inc | Broken Arrow, OK 74012-8247 | Oil & Gas Operator | Mar 2020 |
| 6468 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Feb 2025 |
| 6469 | United States Gypsum Company | Oakfield, NY 14125 | Oil & Gas Operator | Dec 2023 |
| 6470 | United States Trading & Trans | Dallas, TX 75380-3342 | Oil & Gas Operator | Dec 1994 |
| 6471 | United Texas Petroleum Inc. | McKinney, TX 75070 | Oil & Gas Operator | Apr 2025 |
| 6472 | United Western Energy Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 1994 |
| 6473 | Universal Drilling Co., Inc. | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 |
| 6474 | Universal Exploration Inc | Wadsworth, OH 44281-9460-9460 | Oil & Gas Operator | Feb 2012 |
| 6475 | Universal Fuels Company | | Oil & Gas Operator | Oct 1993 |
| 6476 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Apr 2025 |
| 6477 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 6478 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 6479 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jan 2025 |
| 6480 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 6481 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 6482 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 6483 | V A B Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 6484 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Apr 2025 |
| 6485 | Vaca Operating Company LLC | Pacific PLSDS, CA 90272 | Oil & Gas Operator | Aug 2017 |
| 6486 | Vaco Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2003 |
| 6487 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | Feb 2025 |
| 6488 | Valar Petroleum Inc | Houston, TX 77069 | Oil & Gas Operator | May 2006 |
| 6489 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 6490 | Valero Marketing & Supply Co | San Antonio, TX 78269-6000 | Oil & Gas Operator | Sep 2023 |
| 6491 | Valiant Oil & Inv Co | | Oil & Gas Operator | Jan 2025 |
| 6492 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 6493 | Valjohn Energy Corporation | Oklahoma City, OK 73142-6090 | Oil & Gas Operator | Jan 2025 |
| 6494 | Valley Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 6495 | Valley Petrol Consulting Inc | Denton, TX 76205 | Oil Operator | Jan 2025 |
| 6496 | Valpoint Operating, LLC | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 6497 | Van Dall, Don | | Oil Operator | Mar 2015 |
| 6498 | Van Horn I H | Tulsa, OK 74145-5715 | Oil & Gas Operator | Mar 2001 |
| 6499 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 6500 | Van Horn Oil Company | Ada, OK 74820 | Oil & Gas Operator | Oct 1999 |