| 101 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 102 | Smith Red Plains Production LLC | | Oil & Gas Operator | Aug 2025 |
| 103 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 104 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 105 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 106 | Target Oil Company | | Oil & Gas Operator | Mar 2007 |
| 107 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 108 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 109 | Three Sisters LLC | Cheyenne, WY 82001 | Oil Operator | Aug 2025 |
| 110 | Toco Corporation | | Oil & Gas Operator | Oct 1991 |
| 111 | Triangle J Oil Company | | Oil & Gas Operator | Mar 2007 |
| 112 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 113 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 114 | Unioil | Denver, CO 80203 | Oil & Gas Operator | Jun 2012 |
| 115 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 116 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 117 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 118 | Wapiti Oil & Gas LLC | Houston, TX 77024 | Oil Operator | Dec 2011 |
| 119 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 120 | Wave Petroleum Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 121 | West Gas Inc | | Oil & Gas Operator | Dec 2017 |
| 122 | Whisler Enterprise Company | Erie, CO 80516 | Oil & Gas Operator | Aug 2025 |
| 123 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 124 | Wyatt Petroleum Corporation | Evergreen, CO 80437 | Gas Operator | Jul 2002 |
| 125 | Wyoming Western Oil | Pine Bluffs, WY 82082 | Oil Operator | Sep 2019 |
| 126 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Jun 2025 |