| 1 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 2 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 3 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 4 | Tai Inc Dba Trendwell Antrim Inc | | Gas Operator | Oct 2025 |
| 5 | Tallman Industries Inc | | Oil Operator | Oct 2025 |
| 6 | Tallman Trust Co | | Oil Operator | Oct 2025 |
| 7 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 8 | Terra Energy Co LLC | | Oil & Gas Operator | Apr 2018 |
| 9 | Terra Energy LTD | | Oil & Gas Operator | Apr 2018 |
| 10 | Terrel Production Co | | Oil & Gas Operator | Sep 2025 |
| 11 | Three Star Energy Inc | | Gas Operator | Nov 1997 |
| 12 | Tiger Development LLC | | Oil & Gas Operator | Aug 2019 |
| 13 | Tluczek Operating Corporation LLC | | Oil Operator | May 2025 |
| 14 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Dec 2025 |
| 15 | Tolas Oil And Gas Exploration Co | | Oil Operator | Oct 2025 |
| 16 | Tongue Schuster And Associates Inc | | Oil & Gas Operator | Feb 2007 |
| 17 | Total Petroleum Inc | Houston, TX 77210 | Oil & Gas Operator | Feb 1998 |
| 18 | Trahan Petroleum Inc | | Oil Operator | Aug 2025 |
| 19 | Traverse Oil Co | | Oil & Gas Operator | Nov 1983 |
| 20 | Traverse Oil Co And Federal Oil Co | | Oil & Gas Operator | Nov 1983 |
| 21 | Trendwell Energy Corporation | | Oil & Gas Operator | Oct 2025 |
| 22 | Trinity Exploration Co | | Oil Operator | Dec 1998 |
| 23 | Trolz Glynn And Associates Inc | | Oil & Gas Operator | Apr 1995 |
| 24 | Turner Petroleum Corp And Patrick Petroleum Corp | | Oil & Gas Operator | Mar 1991 |
| 25 | Tuscola Energy Inc | | Oil & Gas Operator | Sep 2025 |