| 101 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 102 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 103 | Stearns Oil Company LLC | Willison, ND 58801 | Oil & Gas Operator | Aug 2025 |
| 104 | Stekoll Oil & Gas, LTD. | | Oil Operator | Jun 1963 |
| 105 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Aug 2025 |
| 106 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 107 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 108 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 109 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 110 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 111 | True Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 2003 |
| 112 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 113 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 114 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 115 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 116 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 117 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 118 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 119 | Williston Hunter ND, LLC | | Oil & Gas Operator | Mar 2014 |
| 120 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 121 | Windridge Operating LLC | | Oil & Gas Operator | Aug 2025 |
| 122 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |