| 1 | T & J Oil Production, L.L.C. | Lone Grove, OK 73443 | Oil & Gas Operator | Jun 2025 |
| 2 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Oct 2025 |
| 3 | Tap Operating Company, Inc. | Mexia, TX 76667 | Oil & Gas Operator | May 1995 |
| 4 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Oct 2025 |
| 5 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 6 | Templeton Oil, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 7 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 8 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 9 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 10 | Terry Enterprises, Inc. | West Columbia, TX 77486 | Oil & Gas Operator | Oct 2025 |
| 11 | Terry, R. K. | West Columbia, TX 77486 | Oil & Gas Operator | Oct 2025 |
| 12 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 13 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 14 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 15 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 16 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 17 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 18 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 19 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Oct 2025 |
| 20 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 21 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 22 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 23 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 24 | Texas Standard Oil Operating Co. | Midland, TX 79705 | Oil & Gas Operator | Oct 2019 |
| 25 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 26 | Tharp Operating Company | Houston, TX 77070 | Oil & Gas Operator | Nov 2014 |
| 27 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 28 | Timberwolf Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 29 | Titan Allen Dome LLC | Houston, TX 77056 | Oil Operator | Feb 2015 |
| 30 | Titan Energy Operating LLC | Houston, TX 77056 | Oil Operator | Jan 2016 |
| 31 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Oct 2025 |
| 32 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 33 | Torrent Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 34 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 35 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 36 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 37 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 38 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 39 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 40 | Trinidad Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 41 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 42 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 43 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 44 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Oct 2025 |
| 45 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 46 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Oct 2025 |
| 47 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Oct 2025 |