| 1 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 2 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 3 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 4 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Dec 2025 |
| 5 | Temagami Oil & Gas LTD | | Oil & Gas Operator | May 2007 |
| 6 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 7 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Oct 2025 |
| 8 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 9 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 10 | Texakota | | Oil & Gas Operator | Mar 1995 |
| 11 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 12 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 13 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Oct 2025 |
| 14 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 15 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Dec 2025 |
| 16 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2024 |
| 17 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 18 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 19 | Titan Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 20 | Tonka Oil & Gas Production Inc | Buffalo, WY 82834 | Oil & Gas Operator | Sep 1999 |
| 21 | Torch E & P Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2015 |
| 22 | Torch Oil & Gas Company | Houston, TX 77010 | Oil & Gas Operator | Aug 1997 |
| 23 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 24 | Total Petroleum Inc | Houston, TX 77210 | Oil & Gas Operator | Feb 1998 |
| 25 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 26 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 27 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 28 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 29 | Tresor Petroleum | | Oil & Gas Operator | Sep 1987 |
| 30 | Triangle J Oil Company | | Oil & Gas Operator | Mar 2007 |
| 31 | Trigg Oil Mining Corporation | | Oil & Gas Operator | Dec 2007 |
| 32 | Triple B Energy Inc | Gillette, WY 82716 | Oil Operator | Dec 1999 |
| 33 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 34 | Tripp Oil Company Inc | Houston, TX 77023 | Oil & Gas Operator | Jan 1992 |
| 35 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 36 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 37 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |