| 1 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 2 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2025 |
| 3 | Tau Ventures | Tulsa, OK 74105-1026 | Oil & Gas Operator | Feb 2025 |
| 4 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 5 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2025 |
| 6 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Mar 2025 |
| 7 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 8 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 9 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 10 | Texinia Limited Partnership | Dallas, TX 75201 | Gas Operator | Jan 2017 |
| 11 | Texinia Oil & Gas Inc. | Dallas, TX 75214 | Oil & Gas Operator | Feb 2025 |
| 12 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 13 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 14 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 15 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 16 | Tiger Trucks Inc | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 17 | Tilford Pinson Exploration LLC | Edmond, OK 73003 | Oil & Gas Operator | Feb 2025 |
| 18 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Feb 2025 |
| 19 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 20 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 21 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 22 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 23 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 24 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Mar 2025 |
| 25 | Trepel Petroleum Exploration & | | Oil & Gas Operator | Apr 2014 |
| 26 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Mar 2025 |
| 27 | Tridon Oil Inc | Lafayette, LA 70505-2305 | Gas Operator | Dec 2013 |
| 28 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 29 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 30 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 31 | Trout Disposal Well Inc | Hammon, OK 73650 | Oil & Gas Operator | Jan 2025 |
| 32 | Troy Energy Operating LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 33 | TRP-Ok Properties LLC | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 34 | Truckers Disposal Inc | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2025 |
| 35 | Truevine Gas Company | Ada, OK 74821-1422 | Oil & Gas Operator | Feb 2025 |
| 36 | Tucker Ron & Co | Norman, OK 73069-8511 | Gas Operator | Sep 2017 |
| 37 | Turntable Energy Inc | Ponca City, OK 74604 | Oil & Gas Operator | Jan 2025 |
| 38 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 39 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 40 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |