| 101 | Sawtooth Energy Partners LLC | | Oil & Gas Operator | Nov 2005 |
| 102 | Schneider Energy Services Inc | | Oil & Gas Operator | Aug 2024 |
| 103 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 104 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 105 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 106 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 107 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2024 |
| 108 | Sovereign Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 109 | Starlight Resources LLC | | Oil & Gas Operator | Jun 2006 |
| 110 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 111 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Sep 2024 |
| 112 | Synergy Resources Corporation | | Oil & Gas Operator | Oct 2022 |
| 113 | T P Operating LLC | | Oil & Gas Operator | Nov 1999 |
| 114 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Dec 2024 |
| 115 | Texas Tea Of Colorado LLC Dba Texas Tea LLC | | Oil & Gas Operator | Jun 2021 |
| 116 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Oct 2024 |
| 117 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 118 | Thompson & James Cleo Thompson, Jr.* & J Cleo | | Oil & Gas Operator | Jan 2010 |
| 119 | Thorofare Resources, Inc | | Oil & Gas Operator | May 2011 |
| 120 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Dec 2024 |
| 121 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2023 |
| 122 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 123 | Tudex Petroleum Inc | | Oil & Gas Operator | Sep 2019 |
| 124 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Sep 2024 |
| 125 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Jun 2009 |
| 126 | Verdad Resources LLC | | Oil & Gas Operator | Sep 2024 |
| 127 | Walsh Production Inc | | Oil & Gas Operator | Nov 2008 |
| 128 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Sep 2024 |
| 129 | Western Interior Energy Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2020 |
| 130 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Sep 2024 |
| 131 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 132 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 133 | Wise* Wayne L | | Oil & Gas Operator | Dec 2023 |