| 1 | T P Operating LLC | | Oil & Gas Operator | Nov 1999 |
| 2 | Tabula Rasa Energy, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2020 |
| 3 | Tamco Drilling Inc | | Oil & Gas Operator | Apr 2003 |
| 4 | Tarpon Oil Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2017 |
| 5 | Tbi Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2004 |
| 6 | Terra Exploration & Production Co. Inc. | | Oil & Gas Operator | Dec 2009 |
| 7 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 8 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 9 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 10 | Texas Tea Of Colorado LLC Dba Texas Tea LLC | | Oil & Gas Operator | Jun 2021 |
| 11 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Aug 2025 |
| 12 | Thomas L Spring LLC | | Oil & Gas Operator | Jul 2025 |
| 13 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 14 | Thompson & James Cleo Thompson, Jr.* & J Cleo | | Oil & Gas Operator | Jan 2010 |
| 15 | Thorofare Resources, Inc | | Oil & Gas Operator | May 2011 |
| 16 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 17 | Tidal Wave Energy, Inc. | New Castle, PA 16105 | Oil & Gas Operator | Jun 2022 |
| 18 | Tigges Oil LLC | | Oil & Gas Operator | Dec 2022 |
| 19 | Timber Creek Operating LLC | Granbury, TX 76049 | Oil & Gas Operator | Oct 2025 |
| 20 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2024 |
| 21 | Timka Resources LTD | | Oil & Gas Operator | Aug 2025 |
| 22 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 23 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 24 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 25 | Tom Fenno Production LLC | | Oil Operator | Nov 2019 |
| 26 | Top Operating Company | | Oil & Gas Operator | Oct 2022 |
| 27 | Trend Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 28 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2025 |
| 29 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 30 | Trinity Energy Resources Inc | Houston, TX 77079 | Oil & Gas Operator | Aug 2005 |
| 31 | Triple R Oil Co | | Oil & Gas Operator | Jun 2002 |
| 32 | Trousil & Associates, Inc. | Steamboat SPG, CO 80477 | Oil & Gas Operator | Dec 2006 |
| 33 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 34 | Tudex Petroleum Inc | | Oil & Gas Operator | Sep 2019 |
| 35 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 36 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Aug 2025 |