| 101 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 102 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 103 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 104 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 105 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 106 | Pacific Transmission Supply | | Oil & Gas Operator | Dec 1987 |
| 107 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 108 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 109 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 110 | Pinedale Energy Partners Operating LLC | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2021 |
| 111 | Pinedale Investment Inc | Pinedale, WY 82941 | Oil & Gas Operator | May 2025 |
| 112 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Mar 2025 |
| 113 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 114 | Primary Fuels Inc | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 115 | Pure Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2011 |
| 116 | Purewest Resources Inc | Pinedale, WY 82941 | Oil & Gas Operator | May 2025 |
| 117 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 118 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 119 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jun 2025 |
| 120 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 121 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 122 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 123 | Sharples Phillip T Trust | Denver, CO 80264 | Oil & Gas Operator | Nov 2020 |
| 124 | Shell Rocky Mountain Production LLC | Pinedale, WY 82941 | Oil & Gas Operator | Dec 2008 |
| 125 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 126 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 127 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 128 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 129 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 130 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 131 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 132 | Survivor Oil Inc | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2007 |
| 133 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 134 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Jul 2024 |
| 135 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 136 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 137 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 138 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 139 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jun 2025 |
| 140 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 141 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | May 2025 |
| 142 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 143 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Jul 2025 |
| 144 | Western Gas Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 145 | Western Oil Refining Company | Kemmerrer, WY 83101 | Oil & Gas Operator | Dec 1994 |
| 146 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | May 2025 |
| 147 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 148 | Wnu Energy LLC | Pinedale, WY 82941 | Oil & Gas Operator | May 2025 |
| 149 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 150 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 151 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 152 | WPX Energy RM Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2014 |
| 153 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | May 2025 |
| 154 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 155 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |