| 1 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Feb 2026 |
| 2 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 3 | Taft Investment Co., Inc. | Taft, TX 78390 | Oil Operator | Feb 2026 |
| 4 | Tare Resources, LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Feb 2026 |
| 5 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 6 | Tasca Exploration Company | Houston, TX 77257 | Oil & Gas Operator | Jun 2002 |
| 7 | TBC Petroleum | Cuero, TX 77954 | Oil & Gas Operator | Sep 2023 |
| 8 | Teamco Operating LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2002 |
| 9 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 10 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 11 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 12 | Texacal, Inc. | Newport Beach, CA 92660 | Oil & Gas Operator | Feb 2026 |
| 13 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 14 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 15 | Texas Onshore Energy, Inc. | Austin, TX 78704 | Oil & Gas Operator | Feb 2026 |
| 16 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2026 |
| 17 | Texas Western Energy Corporation | Portland, TX 78374 | Oil & Gas Operator | Nov 2002 |
| 18 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | Feb 2026 |
| 19 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 20 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 21 | Thunderbird Energy, Inc. | Norman, OK 73069 | Oil & Gas Operator | Feb 2026 |
| 22 | Tierra Mineral Development, L.C. | Dallas, TX 75244 | Oil & Gas Operator | Oct 1994 |
| 23 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 24 | Tiza Energy, Inc. | Austin, TX 78715 | Oil & Gas Operator | Feb 2026 |
| 25 | TNT Petroleum Company, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 1996 |
| 26 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 27 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 28 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 29 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 30 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 31 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 32 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 33 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 34 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 35 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Feb 2026 |
| 36 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 37 | Triple 'A' Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 38 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |