| 101 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 102 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 103 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 104 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 105 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 106 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 107 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |
| 108 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 109 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 110 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 111 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 112 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 113 | Schneider Oil Corporation | Broomfield, CO 80020 | Oil & Gas Operator | Aug 2009 |
| 114 | Sierra Trading Corporation | | Oil & Gas Operator | Sep 1978 |
| 115 | Smith Kevin | Thermopolis, WY 82443 | Oil Operator | Sep 2024 |
| 116 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 117 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 118 | Stovall Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 1998 |
| 119 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 120 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 121 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 122 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 123 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 124 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 125 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 126 | Tribar Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 127 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 128 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 129 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 130 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 131 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Sep 2025 |
| 132 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 133 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 134 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 135 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 136 | Van Norman Pipe And Supply | | Oil & Gas Operator | Mar 2010 |
| 137 | Washakie Energies Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2019 |
| 138 | Weaver Dale Inc | Powell, WY 82435 | Oil Operator | Apr 2005 |
| 139 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 140 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 141 | Wind River Exploration | Powell, WY 82435 | Oil & Gas Operator | Sep 2025 |
| 142 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 143 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |