| 1 | Tam2 Squared Operating, LLC | Rockwall, TX 75032 | Oil & Gas Operator | May 2026 |
| 2 | Targa Pipeline Mid-Continent LLC | Sulphur, LA 70665 | Oil & Gas Operator | Jun 2018 |
| 3 | TBM Catarina, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2026 |
| 4 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | May 2026 |
| 5 | TD Natural Resources LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2026 |
| 6 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 7 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | May 2026 |
| 8 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | May 2026 |
| 9 | Texas International Oper., LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2013 |
| 10 | Texas Lone Star Petroleum Corp. | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2013 |
| 11 | Texas Southern Petroleum Corp. | Corpus Christ, TX 78410 | Oil & Gas Operator | May 2026 |
| 12 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | May 2026 |
| 13 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2026 |
| 14 | Texowa, LLC | Roanoke, TX 76262 | Oil Operator | May 2026 |
| 15 | Thalmann Oil Field Service, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2008 |
| 16 | Thalmann Oilfield | Carrizo SPGS, TX 78834 | Oil Operator | May 2026 |
| 17 | Thalmann, David Vac Service Inc | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2026 |
| 18 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | May 2026 |
| 19 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 20 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 21 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 22 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | May 2026 |
| 23 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 24 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2026 |
| 25 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 26 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2026 |
| 27 | Triforce Energy LLC | Littleton, CO 80122 | Oil & Gas Operator | May 2026 |
| 28 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 29 | Tundra Operating LLC | Spring, TX 77386 | Oil Operator | May 2017 |
| 30 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | May 2026 |
| 31 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |