| 1 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 2 | Tall Dune Resources, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jun 2025 |
| 3 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 4 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 5 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 6 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 7 | Tempo Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 8 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2025 |
| 9 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Jun 2025 |
| 10 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2025 |
| 11 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 12 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 13 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 14 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 15 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 16 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 17 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Jun 2025 |
| 18 | Trigeo Energy, LLC | Addison, TX 75001 | Oil & Gas Operator | Jun 2025 |
| 19 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2025 |
| 20 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 21 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 22 | Turner, D. Ann Garrett, Est. Of | Big Spring, TX 79721 | Oil & Gas Operator | Jan 1999 |
| 23 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 24 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2025 |