| 101 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 102 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 103 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 104 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 105 | McCulloch Oil Corp Of Ca | | Oil & Gas Operator | May 1980 |
| 106 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 107 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 108 | Moncrief Oil | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 109 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 110 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 111 | Mountain Oil And Gas Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Dec 2025 |
| 112 | Natural Gas Corp Of Ca | Vernal, UT 84078 | Oil & Gas Operator | Jun 1989 |
| 113 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 114 | North Plains Corp | Tulsa, OK 74137 | Oil & Gas Operator | Sep 2025 |
| 115 | Nova Natural Res Corp | Denver, CO 80202 | Oil & Gas Operator | Nov 1989 |
| 116 | Nova Petroleum Corp | Salt Lake City, UT 84147 | Oil & Gas Operator | Sep 1986 |
| 117 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 118 | Oil Development Co | | Oil & Gas Operator | Jan 1979 |
| 119 | Olympic Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2004 |
| 120 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 121 | Pacific Trans Supply | Vernal, UT 84078 | Oil & Gas Operator | Jul 1987 |
| 122 | Page Petroleum Inc | Calgary, AB T2P3M-3000 | Oil & Gas Operator | Nov 1998 |
| 123 | Paiute Oil & Mining Corp | Salt Lake City, UT 84117 | Oil & Gas Operator | Jun 1989 |
| 124 | Pease, Willard H | Grand Junction, CO 81502 | Gas Operator | May 1995 |
| 125 | Pendragon Energy Partners Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2009 |
| 126 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 127 | Pennzoil Explor & Prod Co | Houston, TX 77002 | Oil & Gas Operator | Mar 2000 |
| 128 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 129 | Petroglyph Operating Co | Boise, ID 83709 | Oil & Gas Operator | Jul 2017 |
| 130 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 131 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 132 | Phoenix Hydro Oper Corp | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 133 | Phoenix Hydrocarbons Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 134 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 135 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 136 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 137 | Quinex Energy Corp | Bountiful, UT 84010 | Oil & Gas Operator | Dec 2025 |
| 138 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 139 | Rig II LLC | Woods Cross, UT 84087 | Oil & Gas Operator | May 2018 |
| 140 | Road Runner Inc | Park City, UT 84060 | Oil & Gas Operator | Aug 2005 |
| 141 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 142 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 143 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 144 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 145 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 146 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 147 | Sego Resources Corp | Denver, CO 80293-0621 | Oil & Gas Operator | Dec 1999 |
| 148 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 149 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 150 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 151 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 152 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 153 | Sohio-Stand Oil Prod Co | Houston, TX 77210-9928 | Oil & Gas Operator | Jan 1989 |
| 154 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 155 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 156 | Standard Oil Co Of Calif | | Oil & Gas Operator | Dec 1983 |
| 157 | Stevenson, Albert | | Oil & Gas Operator | Jun 1979 |
| 158 | Sun Oil Company | Dallas, TX 75373 | Oil & Gas Operator | Dec 2021 |
| 159 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 160 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 161 | Tiger Energy Operating, LLC | Los Angeles, CA 90025 | Oil & Gas Operator | Jan 2026 |
| 162 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 163 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 164 | Travis Oil Co | Los Angeles, CA 90024 | Oil Operator | Jan 1990 |
| 165 | Uinta Oil & Gas | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 1997 |
| 166 | Uinta Wax Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 167 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 168 | United Producing Co Inc | | Oil & Gas Operator | May 1961 |
| 169 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 170 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 171 | Vantage Energy Uinta LLC | Denver, CO 80237-2746 | Oil & Gas Operator | Dec 2017 |
| 172 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 173 | Walker Energy Group | Houston, TX 77215-1089 | Oil & Gas Operator | Jun 1992 |
| 174 | Walker Explor & Prod Corp | Unknown, UT 99999 | Oil & Gas Operator | Dec 1989 |
| 175 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Feb 2026 |
| 176 | Wasatch Oil & Gas Corp | Farmington, UT 84025-0699 | Oil & Gas Operator | Mar 2002 |
| 177 | Wem Operating, LLC | Provo, UT 84604 | Oil & Gas Operator | Dec 2025 |
| 178 | Wessely Energy Company | Dallas, TX 75206 | Oil & Gas Operator | May 2001 |
| 179 | Western Alliance Petroleum | | Oil & Gas Operator | Dec 1987 |
| 180 | Wildrose Resources Corp | Englewood, CO 80110-6007 | Oil & Gas Operator | Mar 2004 |
| 181 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 182 | XCL Assetco, LLC | Houston, TX 77007 | Oil & Gas Operator | Nov 2025 |
| 183 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |