| 1 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 2 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 3 | Targa Pipeline Mid-Continent LLC | Sulphur, LA 70665 | Oil & Gas Operator | Jun 2018 |
| 4 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 5 | Tekna Synergy Corporation | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 6 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Oct 2025 |
| 7 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 8 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 9 | Texan Production | Pearsall, TX 78061 | Oil & Gas Operator | Aug 2003 |
| 10 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | Oct 2025 |
| 11 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 12 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 13 | Texas International Resource LLC | Allen, TX 75013 | Oil Operator | Oct 2025 |
| 14 | Texas Oil And Gas Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Oct 2025 |
| 15 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Oct 2025 |
| 16 | Texas Sunset Energy And Ent Inc | Victoria, TX 77904 | Oil Operator | Aug 2003 |
| 17 | Texas, Les & Co. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 18 | Texas-Ohio Producing Company | Spring, TX 77383 | Oil & Gas Operator | Jul 1995 |
| 19 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 20 | Texstar North America, Inc. | Waynesboro, MS 39367 | Oil & Gas Operator | Aug 1994 |
| 21 | Thalmann Oil Field Service, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2008 |
| 22 | Thalmann, David Vac Service Inc | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2025 |
| 23 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 24 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 25 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 26 | Tiza Energy, Inc. | Austin, TX 78715 | Oil & Gas Operator | Oct 2025 |
| 27 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 28 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 29 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 30 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 31 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 32 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 33 | Trump Energy | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 34 | Tularosa Operating Company | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2024 |
| 35 | Tulsa Minerals Inc | Tulsa, OK 74136-1045 | Oil & Gas Operator | May 2013 |
| 36 | Turner, M. O. | San Antonio, TX 78278 | Oil & Gas Operator | Apr 2003 |
| 37 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |