| 1 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Sep 2026 |
| 2 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 3 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 4 | Teamco Operating LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2002 |
| 5 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2026 |
| 6 | Tensas Delta Explo. Co., LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 7 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Sep 2026 |
| 8 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2026 |
| 9 | Texas Gulf Gas Corporation | Fayetteville, TX 78940 | Oil & Gas Operator | Jun 2005 |
| 10 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 11 | Texas Operating Partners LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 12 | Texas Sunset Energy And Ent Inc | Victoria, TX 77904 | Oil Operator | Aug 2003 |
| 13 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 14 | Thunderbird Energy, Inc. | Norman, OK 73069 | Oil & Gas Operator | Sep 2026 |
| 15 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Sep 2025 |
| 16 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2026 |
| 17 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 18 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 19 | Tri-C Resources Partners I, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 20 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 21 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 22 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 23 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 24 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 25 | Triple L Oil Company | Corpus Christ, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 26 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Sep 2026 |