| 101 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 102 | Stovall Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 1998 |
| 103 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 104 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 105 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 106 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 107 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 108 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 109 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 110 | Tribar Resources LLC | | Oil & Gas Operator | Jun 2026 |
| 111 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 112 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 113 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | May 2026 |
| 114 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 115 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2025 |
| 116 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Jun 2026 |
| 117 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 118 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 119 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 120 | Van Norman Pipe And Supply | | Oil & Gas Operator | Mar 2010 |
| 121 | Washakie Energies Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2019 |
| 122 | Weaver Dale Inc | Powell, WY 82435 | Oil Operator | Apr 2005 |
| 123 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Jul 2026 |
| 124 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 125 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Jun 2026 |
| 126 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 127 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |