| 1 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 2 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 3 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | May 2024 |
| 4 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 5 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 6 | Texas Crude Exploration, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 7 | Texas Crude Oil Co. | | Oil & Gas Operator | Jan 1985 |
| 8 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 9 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 10 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 11 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 12 | Texas Gas Transmission LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2023 |
| 13 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 14 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 15 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 16 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 17 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 18 | Time Energy, L.L.C. | | Oil & Gas Operator | Nov 2020 |
| 19 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 20 | Triumph Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 21 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 22 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |