| 101 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Sep 2026 |
| 102 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 103 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 104 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 105 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 106 | Stalking Horse Energy, LLC | Houston, TX 77062 | Oil Operator | May 2026 |
| 107 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Apr 2021 |
| 108 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 109 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 110 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 111 | Swanson Oil & Gas LLC | Williston, ND 58802 | Oil & Gas Operator | Jun 2026 |
| 112 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 113 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 114 | Toi Operating | Sidney, MT 59270 | Oil Operator | Sep 2019 |
| 115 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jul 2026 |
| 116 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 117 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2026 |
| 118 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2021 |
| 119 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 120 | Wesco Operating Inc | Casper, WY 82602 | Oil & Gas Operator | Jul 2026 |
| 121 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 122 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 123 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 124 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 125 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 126 | Xoil Inc | Aurora, CO 80016 | Oil & Gas Operator | Jul 2023 |
| 127 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |