| 1 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 2 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Dec 2024 |
| 3 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 4 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 5 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Dec 2024 |
| 6 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 7 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2024 |
| 8 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 9 | Texas, Les & Co. | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 10 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 11 | Texcal Oil Inc. | Vidor, TX 77662 | Oil & Gas Operator | Jun 1999 |
| 12 | Texstar North America, Inc. | Waynesboro, MS 39367 | Oil & Gas Operator | Aug 1994 |
| 13 | Titan Rock E&P, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2024 |
| 14 | Tomlinson, Thomas K. Inc. | Port Lavaca, TX 77979 | Oil & Gas Operator | Jul 2003 |
| 15 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 16 | Torrent Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 17 | Tpet Management Inc. | Dallas, TX 75204 | Oil & Gas Operator | Dec 1997 |
| 18 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 19 | Transamerican Natural Gas Corp. | Houston, TX 77032 | Oil & Gas Operator | Aug 2000 |
| 20 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 21 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 22 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 23 | Trinity River Operating Company | Oklahoma City, OK 73147 | Oil & Gas Operator | Dec 2024 |
| 24 | True Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 2003 |
| 25 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 26 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2024 |