| 1 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 2 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Dec 2024 |
| 3 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Dec 2024 |
| 4 | Texas Sunset Energy And Ent Inc | Victoria, TX 77904 | Oil Operator | Aug 2003 |
| 5 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 6 | Texegy Operating Company LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 7 | Tharp Operating Company | Houston, TX 77070 | Oil & Gas Operator | Nov 2014 |
| 8 | The Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 9 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 10 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 11 | Touchstone Resources USA, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2006 |
| 12 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | Dec 2024 |
| 13 | Tri City Oil Co., LLC | Kountze, TX 77625 | Oil Operator | Dec 2024 |
| 14 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 15 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 16 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 17 | Triax Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2018 |
| 18 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 19 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 20 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 21 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2024 |