| 1 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 2 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 3 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Oct 2025 |
| 4 | Taza Energy, Inc. | | Oil & Gas Operator | Nov 2009 |
| 5 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Nov 2025 |
| 6 | Tellus Operating Group, LLC | | Oil & Gas Operator | Aug 2025 |
| 7 | Temple Oil Co | | Oil & Gas Operator | Oct 1992 |
| 8 | Terry Sims & Associates, Inc. | | Oil Operator | Sep 2009 |
| 9 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 10 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Nov 2025 |
| 11 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 12 | Texaco Seaboard, Inc. | | Gas Operator | Sep 1980 |
| 13 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Nov 2025 |
| 14 | Thaxton Operating | | Oil Operator | Jan 1994 |
| 15 | Thomas A. Blanton | | Oil Operator | Aug 2025 |
| 16 | Thunder Oil, LLC | | Oil & Gas Operator | Oct 1998 |
| 17 | Tiger Production Company, LLC | | Oil & Gas Operator | Aug 2021 |
| 18 | Tigrett, Terry A. Jr. | | Oil & Gas Operator | Oct 1980 |
| 19 | Tilghman Operating, LLC. | | Oil & Gas Operator | Aug 2025 |
| 20 | TNT Operating LLC | | Oil & Gas Operator | Aug 2016 |
| 21 | Tomlinson Interests | | Oil & Gas Operator | Jan 1983 |
| 22 | Tops Operating Co.,Inc. | | Oil Operator | Dec 1985 |
| 23 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 24 | Trendsetter Production Co, Inc | | Oil & Gas Operator | Jul 2008 |
| 25 | Tri-Quest Resources | | Oil & Gas Operator | Feb 1995 |
| 26 | Triad Oil & Gas Co Inc | | Oil & Gas Operator | Jun 1994 |
| 27 | Triangle Oil Producers Inc | | Oil & Gas Operator | Jun 1998 |
| 28 | Trident Oil & Gas Corp. | | Oil & Gas Operator | Sep 2000 |
| 29 | Trinity Oil & Gas Dev Inc | | Oil & Gas Operator | Jun 1994 |
| 30 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 31 | Tuway Oil, Inc | | Oil & Gas Operator | Jun 2006 |
| 32 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |