| 1 | Talisman Energy USA Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | May 2016 |
| 2 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 3 | Targa Pipeline Mid-Continent LLC | Sulphur, LA 70665 | Oil & Gas Operator | Jun 2018 |
| 4 | Teal Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2021 |
| 5 | Tekna Synergy Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 6 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 7 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 8 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Dec 2024 |
| 9 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Dec 2024 |
| 10 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 11 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | Dec 2024 |
| 12 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Dec 2024 |
| 13 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 14 | Texas International Oper., LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2013 |
| 15 | Texas Lone Star Petroleum Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2013 |
| 16 | Texas Refining, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2003 |
| 17 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Dec 2024 |
| 18 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Dec 2024 |
| 19 | Texla Energy Products LLC | Houston, TX 77002 | Oil Operator | Sep 2020 |
| 20 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 21 | Thalmann, David Vac Service Inc | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2024 |
| 22 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Dec 2024 |
| 23 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 24 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 25 | Tiza Energy, Inc. | Austin, TX 78715 | Oil & Gas Operator | Dec 2024 |
| 26 | TNT Petroleum Company, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 1996 |
| 27 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Dec 2024 |
| 28 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2024 |
| 29 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 30 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 31 | Tucker Petroleum, Inc. | Corpus Chrsti, TX 78468 | Oil & Gas Operator | Dec 2024 |
| 32 | Turner, M. O. | San Antonio, TX 78278 | Oil & Gas Operator | Apr 2003 |
| 33 | Tuskar (Texas), Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2016 |
| 34 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |