| 1 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Feb 2026 |
| 2 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 3 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 4 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Feb 2026 |
| 5 | TCS Petroleum Co., LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 6 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 7 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 8 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 9 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 10 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 11 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 12 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 13 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |
| 14 | Tiki Oil & Gas, LLC | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 15 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 16 | TKP Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Feb 2026 |
| 17 | Toc Energy Resources, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 18 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 19 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 20 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 21 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 22 | Trilogy Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 23 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 24 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Feb 2026 |
| 25 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Feb 2026 |
| 26 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 27 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 28 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |