| 1 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 2 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 3 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 4 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 5 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jul 2025 |
| 6 | Tecolote Energy Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 7 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 8 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2025 |
| 9 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 10 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jul 2025 |
| 11 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 12 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 13 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 14 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 15 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 16 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 17 | The William R Earnhardt Company | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 18 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 19 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 20 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 21 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 22 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2025 |
| 23 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 24 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 25 | Trenon Oil & Gas Inc | Oklahoma City, OK 73112-4279 | Oil & Gas Operator | Sep 1996 |
| 26 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Jul 2025 |
| 27 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 28 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 29 | Trout Disposal Well Inc | Hammon, OK 73650 | Oil & Gas Operator | Jan 2025 |
| 30 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Jul 2025 |
| 31 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 32 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 33 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |