| 101 | McCulloch Geothermal Corporation | | Oil & Gas Operator | Jun 1982 |
| 102 | McCulloch Oil Corp Of Ca | | Oil & Gas Operator | May 1980 |
| 103 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 104 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 105 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 106 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | May 2020 |
| 107 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 108 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 109 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 110 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Feb 2026 |
| 111 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 112 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 113 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 114 | Milestone Pet/El Paso Expl | | Oil & Gas Operator | Jul 1985 |
| 115 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 116 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 117 | Mobil Explor & Prod | Cortez, CO 81321 | Oil & Gas Operator | May 2001 |
| 118 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 119 | Moncrief Oil | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 120 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 121 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 122 | Mountain States Petroleum Corp | Midland, TX 79702 | Oil & Gas Operator | Apr 2008 |
| 123 | Murdoch Oil Co Inc | Bluff, UT 84512 | Oil & Gas Operator | Jun 2010 |
| 124 | Nacogdoches Oil & Gas Inc | Nacogdoches, TX 75963 | Oil & Gas Operator | Apr 2026 |
| 125 | Navajo Nation Oil & Gas Co | Window Rock, AZ 86511 | Oil & Gas Operator | Oct 2012 |
| 126 | Nnogc Exploration & Production, LLC | Window Rock, AZ 86515 | Oil & Gas Operator | Feb 2026 |
| 127 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 128 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 129 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 130 | Pacific Energy & Mining Company | Reno, NV 89511 | Oil & Gas Operator | Sep 2022 |
| 131 | Pan American Petroleum Cor | | Oil & Gas Operator | Dec 1981 |
| 132 | Paradox Upstream, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 133 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 134 | Pease Oil & Gas Company | Grand Junction, CO 81506 | Oil & Gas Operator | May 2000 |
| 135 | Petral Exploration LLC | Denver, CO 80217-5083 | Oil & Gas Operator | Dec 2001 |
| 136 | Petro Mex, LLC | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 137 | Petrodril Inc | Farmington, NM 87401 | Oil & Gas Operator | Jan 1987 |
| 138 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 139 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 140 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 141 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2025 |
| 142 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 143 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2026 |
| 144 | Pubco Petroleum Corp | Albuquerque, NM 87104 | Oil & Gas Operator | Dec 1981 |
| 145 | Pure Oil Co | | Oil & Gas Operator | Dec 1996 |
| 146 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 147 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 148 | R & R Well Service | Fort Worth, TX 76120 | Oil & Gas Operator | Jan 2005 |
| 149 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 150 | Reynolds Mining Corp | | Oil & Gas Operator | Aug 1968 |
| 151 | RG Exploration, LLC | Midland, TX 78705 | Oil & Gas Operator | Feb 2020 |
| 152 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Feb 2026 |
| 153 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2026 |
| 154 | Rim Southwest Corp | Farmington, NM 87499-2058 | Oil & Gas Operator | Feb 2026 |
| 155 | Robert L Bayless Producer, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 156 | Roddy Production Company Inc | Farmington, NM 87401 | Oil & Gas Operator | Feb 2026 |
| 157 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 158 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 159 | San Juan Minerals Explor | Mexican Hat, UT 84531 | Oil & Gas Operator | Apr 2006 |
| 160 | Sanchez-Obrien Oil & Gas | | Oil & Gas Operator | Aug 1986 |
| 161 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Feb 2026 |
| 162 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 163 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Apr 2026 |
| 164 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 165 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 166 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 167 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 168 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 169 | Standard Oil Co Of Calif | | Oil & Gas Operator | Dec 1983 |
| 170 | Sterling Energy Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1995 |
| 171 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 172 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 173 | Subsurface Resources Inc | Logan, UT 84321 | Oil & Gas Operator | Aug 1990 |
| 174 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Jan 2026 |
| 175 | Sunfield Energy Company | Houston, TX 77084-5113 | Oil & Gas Operator | Jul 1999 |
| 176 | Sunray DX Oil Co | | Gas Operator | Dec 1983 |
| 177 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 178 | Supreme X Oil Company | | Oil & Gas Operator | Dec 1983 |
| 179 | Supron Energy Corp | | Oil & Gas Operator | Oct 1995 |
| 180 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Nov 2025 |
| 181 | Tall Dune Resources, LLC | Boerne, TX 78006 | Oil & Gas Operator | Apr 2026 |
| 182 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 183 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Apr 2026 |
| 184 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 185 | Texas Eastern Skyline Oil | Houston, TX 77252 | Oil & Gas Operator | Jan 1987 |
| 186 | The Texas Company | FT Worth, TX 76101 | Oil & Gas Operator | Dec 2013 |
| 187 | Three States Natural Gas | | Oil & Gas Operator | Mar 1976 |
| 188 | Tidewater Co | | Oil & Gas Operator | Sep 1967 |
| 189 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Apr 2026 |
| 190 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 191 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 192 | Total Petroleum Inc | Houston, TX 77210 | Oil & Gas Operator | Feb 1998 |
| 193 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 194 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 195 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 196 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 197 | Union Petrochemical | | Oil & Gas Operator | Dec 1982 |
| 198 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Feb 2026 |
| 199 | Webb, Max D | Farmington, NM 87499 | Oil Operator | Dec 2022 |
| 200 | Weger Petroleum Corp | Dallas, TX 75251 | Oil Operator | Jan 1987 |