| 101 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 102 | Polumbus Corp, The | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 103 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 104 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2025 |
| 105 | Principle Petroleum LLC | Dallas, TX 75313 | Oil Operator | Jan 2025 |
| 106 | Qualmay Development LLC | Cody, WY 82414 | Oil & Gas Operator | Jun 2023 |
| 107 | Rael Resources LLC | Cowley, WY 82420 | Oil Operator | Jan 2025 |
| 108 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2024 |
| 109 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 110 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Dec 2024 |
| 111 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 112 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 113 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 114 | Sendero Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 115 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 116 | Smith Kevin | Thermopolis, WY 82443 | Oil Operator | Sep 2024 |
| 117 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 118 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 119 | Swenco-Western Inc | Houston, TX 77060 | Oil & Gas Operator | Jan 1997 |
| 120 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 121 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 122 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 123 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 124 | Terex Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Aug 2019 |
| 125 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 126 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 127 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 128 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 129 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Mar 2025 |
| 130 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 131 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 132 | Unicorn Drilling Inc | Cody, WY 82414 | Oil Operator | Dec 1998 |
| 133 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 134 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Mar 2025 |
| 135 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 136 | Vaquero Big Horn LLC | Bakersfield, CA 93309 | Oil & Gas Operator | Jan 2025 |
| 137 | Vesta Inc | Great Falls, MT 59403 | Gas Operator | Mar 1997 |
| 138 | Voyager Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2006 |
| 139 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 140 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 141 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 142 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 143 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 144 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 145 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2025 |
| 146 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Jan 2025 |