| 28401 | T C Production | | Oil Operator | May 1994 |
| 28402 | T D Cox Oil Corporation | | Oil & Gas Operator | Jul 2025 |
| 28403 | T D Energy Company Inc | Broken Arrow, OK 74011-3953 | Oil & Gas Operator | Feb 2015 |
| 28404 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Nov 2025 |
| 28405 | T E F Inc | Madill, OK 73446-6656 | Oil & Gas Operator | Jul 2023 |
| 28406 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Jul 2025 |
| 28407 | T G & S Oil | Marietta, OK 73448 | Oil & Gas Operator | Apr 2025 |
| 28408 | T G T Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Jun 2025 |
| 28409 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 28410 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 28411 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 28412 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 28413 | T J Water Works, A Texas LLC | Ballinger, TX 76821 | Oil & Gas Operator | Nov 2025 |
| 28414 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 28415 | T L C Oil Inc | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 28416 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28417 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 28418 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 28419 | T T & T Inc | Shawnee, OK 74802-3694 | Oil & Gas Operator | Jan 1994 |
| 28420 | T W Clemons Operating Co., LLC | Minden, LA 71055 | Oil & Gas Operator | Nov 2025 |
| 28421 | T W Law LLC | Muskogee, OK 74403-6736 | Oil Operator | Jun 2025 |
| 28422 | T Willoughby, LLC | Ada, OK 74820 | Oil Operator | Jul 2025 |
| 28423 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 28424 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Nov 2025 |
| 28425 | T&T Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 28426 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 28427 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 28428 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 28429 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 28430 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 28431 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Nov 2025 |
| 28432 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 28433 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 28434 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 28435 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 28436 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2025 |
| 28437 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 28438 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 28439 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Nov 2025 |
| 28440 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Nov 2025 |
| 28441 | T. A. Atkinson Opr. | | Gas Operator | Dec 1997 |
| 28442 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Nov 2025 |
| 28443 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Nov 2025 |
| 28444 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 28445 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 28446 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Aug 2025 |
| 28447 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 28448 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 28449 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28450 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 28451 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 28452 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 28453 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 28454 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 28455 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 28456 | T. N. T. Inc. | | Oil & Gas Operator | Jan 1987 |
| 28457 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 28458 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Aug 2025 |
| 28459 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 28460 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 28461 | T. W. Drilling Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2002 |
| 28462 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 28463 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 28464 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 28465 | T.C. Harris Pumping LLC | Hennessey, OK 73742 | Gas Operator | Jul 2025 |
| 28466 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 28467 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 28468 | T.D. Operating Company, Inc. | New Braunfels, TX 78130 | Oil & Gas Operator | Nov 1999 |
| 28469 | T.F. Well Service, L.L.C. | Iowa Park, TX 76367 | Oil Operator | Nov 2025 |
| 28470 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 28471 | T.J. Oil | | Oil Operator | Oct 2024 |
| 28472 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | Nov 2025 |
| 28473 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 28474 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 28475 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 28476 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Aug 2025 |
| 28477 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 28478 | Tab Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2025 |
| 28479 | Tabbs Bay Production Company | Houston, TX 77019 | Oil Operator | Nov 2025 |
| 28480 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 28481 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |
| 28482 | Taber Oil Co | | Oil Operator | Sep 2018 |
| 28483 | Taber, Grover E. Jr. | Cocoa, FL 32926 | Gas Operator | Dec 2024 |
| 28484 | Tabor Creek Oil Company | Albany, TX 76430 | Oil & Gas Operator | Nov 2025 |
| 28485 | Tabor, Danny | Scottsville, KY 42164 | Oil Operator | Dec 2023 |
| 28486 | Tabula Rasa Energy, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2020 |
| 28487 | Tacitus, LLC | Farmington, NM 87401 | Oil & Gas Operator | Sep 2025 |
| 28488 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 28489 | Tackett & Sons DRLG Contractors, Inc | Salyersville, , K 41465 | Oil & Gas Operator | Dec 2023 |
| 28490 | Tacor Resources Inc | Midland, TX 79705 | Oil & Gas Operator | Nov 2025 |
| 28491 | Tactical Oil & Gas, LLC | Odessa, TX 79768 | Oil & Gas Operator | Nov 2025 |
| 28492 | Tactical Operating Company, LLC | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 28493 | Tadlock Properites | | Oil & Gas Operator | Jan 1994 |
| 28494 | Taft Investment Co., Inc. | Taft, TX 78390 | Oil Operator | Nov 2025 |
| 28495 | Taft Oil And Gas LLC | Bonham, TX 75418 | Oil & Gas Operator | Dec 2018 |
| 28496 | Tag Enterprises Inc | Shelocta, PA 15774-0310 | Gas Operator | Dec 2016 |
| 28497 | Tag Oil | La Vernia, TX 78121 | Oil Operator | Nov 2025 |
| 28498 | Tag Oil Co LLC | Ringling, OK 73456 | Oil & Gas Operator | Jul 2025 |
| 28499 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Nov 2025 |
| 28500 | Tag Petroleum Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jan 2021 |