| 101 | RWL Enterprises | | Oil & Gas Operator | Feb 2017 |
| 102 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Dec 2025 |
| 103 | Schneider Energy Services Inc | | Oil & Gas Operator | Nov 2025 |
| 104 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 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 | Dec 2025 |
| 108 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 109 | Starlight Resources LLC | | Oil & Gas Operator | Apr 2006 |
| 110 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 111 | Stoneham Production LLC | | Oil & Gas Operator | Dec 2025 |
| 112 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Nov 2025 |
| 113 | Summit Oil & Gas, LLC | | Oil & Gas Operator | Nov 2024 |
| 114 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Dec 2025 |
| 115 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 116 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 117 | Texas Tea Of Colorado LLC Dba Texas Tea LLC | | Oil & Gas Operator | Jun 2021 |
| 118 | Tidal Wave Energy, Inc. | New Castle, PA 16105 | Oil & Gas Operator | Jun 2022 |
| 119 | Tigges Oil LLC | | Oil & Gas Operator | Dec 2022 |
| 120 | Timka Resources, LTD | | Oil & Gas Operator | Jan 2026 |
| 121 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 122 | Top Operating Company | | Oil & Gas Operator | Jul 2022 |
| 123 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 124 | Tudex Petroleum Inc | | Oil & Gas Operator | Sep 2019 |
| 125 | Unioil | Denver, CO 80203 | Oil & Gas Operator | Dec 2010 |
| 126 | Verdad Resources LLC | | Oil & Gas Operator | Nov 2025 |
| 127 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Nov 2025 |
| 128 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Nov 2025 |
| 129 | Wy Woodland Operating, LLC | Covington, TX 76636 | Oil & Gas Operator | Feb 2026 |