| 1 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 2 | Tensas Delta Exploration Company, LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 3 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 4 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 5 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 6 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 7 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 8 | The Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 9 | Thrall Texas Oil, LLC | | Oil & Gas Operator | Jul 2024 |
| 10 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 11 | Tom Littlepage Oil Properties | | Oil & Gas Operator | Dec 1984 |
| 12 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 13 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 14 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 15 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 16 | Tryvest, Inc. | | Oil & Gas Operator | Sep 1991 |
| 17 | Turnkey E&P Corporation | | Oil & Gas Operator | Dec 2010 |