| 1 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 2 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 3 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 4 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 5 | Terrell Oil & Gas Production Co. | Hamlin, TX 79520 | Oil & Gas Operator | Oct 2025 |
| 6 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 7 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 8 | Texas Operating & Consult., LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2018 |
| 9 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 10 | Texzona Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1997 |
| 11 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 12 | Three R Oil Company | Post, TX 79356 | Oil & Gas Operator | Oct 2025 |
| 13 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 14 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 15 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 16 | TLH Production LLC | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 17 | TMBR/Sharp Drilling, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2004 |
| 18 | Tong Petrotech Inc. | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |
| 19 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 20 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 21 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 22 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 23 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |