| 1 | Tal-Con, Inc. | Houston, TX 77279 | Oil & Gas Operator | Mar 2025 |
| 2 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 3 | Tanglewood Oil & Gas Co. | Gouldbusk, TX 76845 | Oil & Gas Operator | Mar 2025 |
| 4 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 5 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Mar 2025 |
| 6 | TC3 Energy Services Company | Bryan, TX 77805 | Oil & Gas Operator | Jan 2005 |
| 7 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 8 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 9 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 10 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 11 | Tekna Synergy Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 12 | Terry Petroleum Company | Houston, TX 77270 | Oil & Gas Operator | Dec 1997 |
| 13 | Tex-Lee Operating Company | Giddings, TX 78942 | Oil & Gas Operator | Mar 2025 |
| 14 | Tex-Oak, Inc. | Oklahoma City, OK 73155 | Oil & Gas Operator | Dec 1995 |
| 15 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 16 | Texas Energy Reserves, Inc | New Braunfels, TX 78130 | Oil & Gas Operator | Jun 1996 |
| 17 | Texas Onshore Energy, Inc. | Austin, TX 78704 | Oil & Gas Operator | Mar 2025 |
| 18 | Texas Refining, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2003 |
| 19 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 20 | Texican Crude & Hydrocarbons LLC | Houston, TX 77002 | Oil Operator | Sep 2023 |
| 21 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 22 | Tiza Operating Company | Austin, TX 78716 | Oil & Gas Operator | Jan 2000 |
| 23 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2024 |
| 24 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 25 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 26 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 27 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 28 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 29 | Trivista Operating LLC | Giddings, TX 78942 | Oil & Gas Operator | Mar 2025 |
| 30 | Trump Energy | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 31 | Tsar Energy, LLC | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 32 | TT Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 33 | Two Bit Operating Company LLC | Fort Worth, TX 76110 | Oil & Gas Operator | Mar 2025 |
| 34 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Mar 2025 |