| 101 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 102 | Northstar Gas Company Of Texas | Houston, TX 77057-2768 | Oil & Gas Operator | Jun 2025 |
| 103 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |
| 104 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 105 | Odegard Resources/Omni Exp | Columbus, OH 43207 | Oil & Gas Operator | Sep 1986 |
| 106 | Oil Inc | | Oil & Gas Operator | Dec 1971 |
| 107 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 108 | Pacific Energy & Mining Company | Reno, NV 89511 | Oil & Gas Operator | Aug 2020 |
| 109 | Pacific Natural Gas Explor | | Oil & Gas Operator | Dec 1974 |
| 110 | Pacific Trans Supply | Vernal, UT 84078 | Oil & Gas Operator | Jul 1987 |
| 111 | Pan American Petroleum Cor | | Oil & Gas Operator | Dec 1981 |
| 112 | Parker Energy Tech Inc | Salt Lake City, UT 84171 | Oil Operator | Nov 2013 |
| 113 | Pease Oil & Gas Company | Grand Junction, CO 81506 | Oil & Gas Operator | May 2000 |
| 114 | Pease, Willard H | Grand Junction, CO 81502 | Gas Operator | May 1995 |
| 115 | Petro-X Corporation | Houston, TX 77092 | Oil & Gas Operator | Jul 2002 |
| 116 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 117 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Mar 2025 |
| 118 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 119 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 120 | Pride Ventures LLC | Moab, UT 84532 | Oil & Gas Operator | Apr 2025 |
| 121 | Pumpelly, Raphael SR | Pac Palisades, CA 90272 | Oil & Gas Operator | Feb 1991 |
| 122 | Pure Oil Co | | Oil & Gas Operator | Dec 1996 |
| 123 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 124 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 125 | Resource Development Technology LLC | Morrison, CO 80465 | Oil & Gas Operator | Oct 2020 |
| 126 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 127 | Rockies Standard Oil Company | Provo, UT 84604 | Oil & Gas Operator | Oct 2020 |
| 128 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 129 | Rose Petroleum (Us), LLC | Parker, CO 80134 | Oil & Gas Operator | Jul 2016 |
| 130 | Rose Petroleum (Utah) LLC | Annapolis, MD 21401 | Oil & Gas Operator | May 2025 |
| 131 | Rose, Verl | Spring Creek, NV 89815 | Oil & Gas Operator | Feb 2011 |
| 132 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | May 2025 |
| 133 | Ruby, Glen Et Al | | Oil & Gas Operator | Dec 1981 |
| 134 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 135 | S O A L LLC | Farmington, NM 87499-2165 | Oil & Gas Operator | Oct 2022 |
| 136 | S W Energy Corporation | Salt Lake City, UT 84102 | Oil & Gas Operator | May 2020 |
| 137 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Jul 2025 |
| 138 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 139 | Saturn Resources Corp | Springboro, OH 45066 | Oil & Gas Operator | Dec 1998 |
| 140 | Schuster Homes Inc | Rangely, CO 81648 | Oil & Gas Operator | Apr 2013 |
| 141 | Sep Cisco Dome II, LLC | Orem, UT 84097 | Oil & Gas Operator | Apr 2025 |
| 142 | Sep Cisco Dome LLC | Orem, UT 84097 | Oil & Gas Operator | Mar 2015 |
| 143 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 144 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Jul 2025 |
| 145 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 146 | Smoot, Richard P | Salt Lake City, UT 84102 | Oil & Gas Operator | Oct 2010 |
| 147 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 148 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 149 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 150 | Star Oil Operating Company LLC | Laramie, WY 82073 | Oil & Gas Operator | Jun 2025 |
| 151 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 152 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Apr 2025 |
| 153 | Sunray DX Oil Co | | Gas Operator | Dec 1983 |
| 154 | Supron Energy Corp | | Oil & Gas Operator | Oct 1995 |
| 155 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 156 | Tamarack Energy Inc | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 157 | Tejas Gas Corp | | Oil & Gas Operator | Dec 1974 |
| 158 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Apr 2025 |
| 159 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 160 | Teton Energy Co Inc | Denver, CO 80239 | Oil Operator | Dec 1983 |
| 161 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Jul 2025 |
| 162 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 163 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 164 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 165 | Texas Oil & Gas | Denver, CO 80264 | Oil & Gas Operator | Oct 1981 |
| 166 | Texoma Production Co | | Oil & Gas Operator | Jun 1986 |
| 167 | Thompson, J C | Denver, CO 80237-2843 | Oil & Gas Operator | Jul 2005 |
| 168 | Three States Natural Gas | | Oil & Gas Operator | Mar 1976 |
| 169 | Thriftway Company | Farmington, NM 87401 | Oil & Gas Operator | Dec 1996 |
| 170 | Tidewater Co | | Oil & Gas Operator | Sep 1967 |
| 171 | Toledo Mining Co | Irving, TX 75061 | Oil Operator | Dec 1989 |
| 172 | Trend Oil Co | Petaluma, CA 94954 | Oil & Gas Operator | Feb 2017 |
| 173 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 174 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 175 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 176 | Underwood, Rip C | Amarillo, TX 79101 | Gas Operator | Sep 1963 |
| 177 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 178 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 179 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 180 | Urban, C A & Tersell L W | | Gas Operator | Aug 1937 |
| 181 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | May 2025 |
| 182 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 183 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Jan 2004 |
| 184 | Vukasovich Drilling | | Oil & Gas Operator | Mar 1988 |
| 185 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | May 2025 |
| 186 | Willard Pease Drilling Co | Grand Junction, CO 81501 | Oil & Gas Operator | Dec 1983 |
| 187 | William G Bush | Grand Junction, CO 81506 | Oil & Gas Operator | Jun 2012 |
| 188 | Woosley, James P | Moab, UT 84532 | Oil & Gas Operator | Apr 2025 |