| 101 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 102 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Nov 2024 |
| 103 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 104 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 105 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 106 | Terex Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Aug 2019 |
| 107 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 108 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 109 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Nov 2024 |
| 110 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 111 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 112 | Trigg Oil Mining Corporation | | Oil & Gas Operator | Dec 2007 |
| 113 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 114 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Sep 2024 |
| 115 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 116 | Voyager Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2006 |
| 117 | Webster Joe | | Oil Operator | Apr 1987 |
| 118 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 119 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 120 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Sep 2024 |
| 121 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 122 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 123 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2024 |
| 124 | Wychgram Daniel C | Thermopolis, WY 82443 | Oil Operator | Feb 2001 |
| 125 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |