| 1 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Dec 2024 |
| 2 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 3 | Tanglewood Oil & Gas LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2017 |
| 4 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 5 | Targe Energy Exploration And Production, LLC | Denver, CO 80202 | Gas Operator | Oct 2013 |
| 6 | Tempel Contracting, Inc. | Joplin, MT 59531 | Gas Operator | Nov 2024 |
| 7 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 8 | Terrol Energy, Inc. | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 9 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Nov 2024 |
| 10 | Texakoma Exploration & Production LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 11 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 12 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2024 |
| 13 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Mar 2025 |
| 14 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 15 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Mar 2025 |
| 16 | TNT Oil, LLC | Conrad, MT 59425 | Oil Operator | Nov 2017 |
| 17 | Toi Operating | Sidney, MT 59270 | Oil Operator | Sep 2019 |
| 18 | Tomahawk Oil Company, Inc. | Roundup, MT 59072 | Oil Operator | Dec 2024 |
| 19 | Topaz Oil & Gas Inc | Fort Collins, CO 80627 | Gas Operator | Nov 2019 |
| 20 | Triangle USA Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2021 |
| 21 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 22 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 23 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 24 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2024 |
| 25 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |