| 1 | T-Square Petroleum | Rising Star, TX 76471 | Oil & Gas Operator | Feb 2026 |
| 2 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Feb 2026 |
| 3 | Talisman Resources, Inc. | Argyle, TX 76226 | Oil & Gas Operator | Mar 1995 |
| 4 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 5 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 6 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 7 | Tayco Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Nov 1996 |
| 8 | Teague Operating Co. | Mabank, TX 75147 | Oil & Gas Operator | Jul 1995 |
| 9 | Tejas Jack Sales, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 10 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Feb 2026 |
| 11 | Terrick Resources | Midland, TX 79708 | Oil & Gas Operator | Jul 2005 |
| 12 | Texas Sands Resources, LLC | Abilene, TX 79603 | Oil Operator | Feb 2026 |
| 13 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Feb 2026 |
| 14 | Texxon Resources, Inc. | Winter Park, FL 32792 | Oil & Gas Operator | Feb 2026 |
| 15 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 16 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |
| 17 | Thrifty Well Service | Rice, TX 75155 | Oil & Gas Operator | Jun 2009 |
| 18 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 19 | TNT Energy Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 2013 |
| 20 | Tom-Tom Operating, LLC | Dallas, TX 75209 | Oil & Gas Operator | Feb 2026 |
| 21 | Tomco Oil & Gas Inc. | Comanche, TX 76442 | Oil & Gas Operator | Feb 2026 |
| 22 | Torch Operating LLC | Fort Worth, TX 76135 | Oil & Gas Operator | Oct 2020 |
| 23 | TPC Exploration, LLC | May, TX 76857 | Oil & Gas Operator | Feb 2026 |
| 24 | Tri Energy Resources, Inc. | Norman, OK 73070 | Oil Operator | Feb 2026 |
| 25 | Triple D Oil & Gas Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Feb 2026 |
| 26 | Tritex Resources, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2009 |
| 27 | Trust Oil Co. | Pine, CO 80470 | Oil & Gas Operator | Feb 2026 |
| 28 | Trustar Operating Company Inc. | Austin, TX 78750 | Oil Operator | Feb 2026 |
| 29 | Turner, Greg | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 30 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |