| 1 | T & D Oil LLC (Osage Only) | | Oil & Gas Operator | Apr 2025 |
| 2 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | Sep 2025 |
| 3 | T And S Exploration LLC | | Oil Operator | Jun 2025 |
| 4 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Jul 2025 |
| 5 | T D Cox Oil Corporation | | Oil & Gas Operator | Jun 2025 |
| 6 | Tallgrass Petroleum Corporation | | Oil & Gas Operator | Feb 2012 |
| 7 | Tap Petroleum Inc | Cleveland, OK 74020-0054 | Oil & Gas Operator | Apr 2020 |
| 8 | Taurus Minerals Inc /Osage Only | | Oil Operator | Aug 2013 |
| 9 | Taylor Cliff | | Oil & Gas Operator | Jun 2025 |
| 10 | Taylor James A | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 11 | Teale F William | Tulsa, OK 74136-1017 | Oil & Gas Operator | Jun 2000 |
| 12 | Tec Resources, L.L.C. | Tulsa, OK 74128 | Oil & Gas Operator | May 2013 |
| 13 | Tekenergy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 14 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | May 2025 |
| 15 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 16 | Texaco Oils, Inc. | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 17 | TGT Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | May 2025 |
| 18 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 19 | The Elliott Oil Corporation | | Oil & Gas Operator | Jun 2025 |
| 20 | The Galaxy Corporation | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 2025 |
| 21 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 22 | Thomas, Ellis W | | Oil & Gas Operator | Jun 2025 |
| 23 | Threet David Allen | Sand Springs, OK 74063-4035 | Oil & Gas Operator | Jun 2025 |
| 24 | Thunder Petroleum LLC | Owasso, OK 74055-1563 | Oil Operator | Sep 2022 |
| 25 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 26 | Tilley Matt Dba Tilley Oil Co | Hominy, OK 74035 | Oil & Gas Operator | Jun 2025 |
| 27 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Sep 2025 |
| 28 | Tilley Oil Inc | Velma, OK 73491 | Oil & Gas Operator | Jul 2025 |
| 29 | Timber Hill Energy | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2011 |
| 30 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 31 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 32 | TKL Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | May 2025 |
| 33 | Toco Oil & Gas Co | Grapevine, TX 76051 | Oil & Gas Operator | Feb 1993 |
| 34 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 35 | Tony Oil Company | | Oil & Gas Operator | Jun 2025 |
| 36 | Toomey Oil Company Inc | Tulsa, OK 74120 | Oil & Gas Operator | Jul 2025 |
| 37 | Topco Inc | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2005 |
| 38 | Trace Operating Co & R Hudson | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 39 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Jun 2025 |
| 40 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 41 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 42 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 43 | Tucker, Timothy R | | Oil Operator | May 2025 |
| 44 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 45 | Two Pines | Drumright, OK 74030-5502 | Oil & Gas Operator | Feb 2012 |
| 46 | Tyler, Scott A | | Oil & Gas Operator | Jun 2025 |
| 47 | Tyler, Steven Lee | | Oil Operator | May 2014 |