| 101 | JP Oil Wyoming LLC | Lafayette, LA 70505 | Oil & Gas Operator | Aug 2025 |
| 102 | Juniper Petroleum Corporation | | Oil & Gas Operator | Aug 1983 |
| 103 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 104 | Kant Walter F | Lance Creek, WY 82222 | Oil & Gas Operator | Dec 2002 |
| 105 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 106 | Kenai Oil & Gas Inc | | Oil & Gas Operator | Jun 1987 |
| 107 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 108 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 109 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 110 | Krejci Harry L | | Oil & Gas Operator | Jul 2025 |
| 111 | L & J Operating Inc | Gillette, WY 82718 | Oil & Gas Operator | Aug 2016 |
| 112 | L R Company | Casper, WY 82602 | Oil & Gas Operator | Sep 2007 |
| 113 | Lear Petroleum Exploration | | Oil & Gas Operator | Jul 2013 |
| 114 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 115 | Lusk Operating LLC | Denver, CO 80202 | Oil Operator | Jun 2017 |
| 116 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | Aug 2025 |
| 117 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 118 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 119 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 120 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 121 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 122 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 123 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 124 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 125 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 126 | Millennium Oil & Gas LLC | Denver, CO 80203 | Oil & Gas Operator | Aug 2025 |
| 127 | Morgan Energy Corporation | Englewood, CO 80110 | Oil & Gas Operator | Mar 2006 |
| 128 | Mosbacher Production Co. | Houston, TX 77001 | Oil & Gas Operator | Aug 1984 |
| 129 | Murphy D V | | Oil Operator | Dec 1989 |
| 130 | Murphy Sheldon L & Loretta | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2025 |
| 131 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 132 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 133 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 134 | North Finn LLC | Casper, WY 82605 | Oil & Gas Operator | Aug 2025 |
| 135 | Nova Petroleum Cororation | | Oil & Gas Operator | Mar 1987 |
| 136 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Oct 2025 |
| 137 | Oedekoven Water & Hot Oil | Recluse, WY 82725 | Oil & Gas Operator | Sep 2025 |
| 138 | Okt Petroleum Company Inc | Oklahoma City, OK 73118-7425 | Oil & Gas Operator | Oct 2013 |
| 139 | Olympic Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2004 |
| 140 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 141 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 142 | Rathpro Inc | Douglas, WY 82633 | Oil & Gas Operator | Feb 1994 |
| 143 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Aug 2025 |
| 144 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 145 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jul 2025 |
| 146 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 147 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Oct 2025 |
| 148 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 149 | Royal Oil LLC | Flower Mound, TX 75028 | Oil Operator | Dec 2015 |
| 150 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 151 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 152 | Seedy Draw LLC | Greenwood VIllage, CO 80111 | Oil Operator | Jul 2025 |
| 153 | Seer Operating LLC | Sheridan, WY 82801 | Oil & Gas Operator | Oct 2016 |
| 154 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 155 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 156 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 157 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 158 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Jul 2025 |
| 159 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 160 | Smith Al | Duncan, OK 73534-0037 | Oil Operator | Dec 1998 |
| 161 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 162 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 163 | Sooner Operating Co Inc | Casper, WY 83602 | Oil Operator | Aug 2025 |
| 164 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 165 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 166 | Stone & Wolf LLC | Sheridan, WY 82801 | Oil & Gas Operator | Dec 2006 |
| 167 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 168 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Aug 2025 |
| 169 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 170 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 171 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 172 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 173 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 174 | Thunder Basin Resources LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2023 |
| 175 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 176 | Toco Corporation | | Oil & Gas Operator | Oct 1991 |
| 177 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 178 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 179 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 180 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Aug 2025 |
| 181 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 182 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | Jul 2025 |
| 183 | Vermilion Energy USA LLC | | Oil & Gas Operator | Jul 2025 |
| 184 | Walker L Willis | | Oil Operator | Dec 1985 |
| 185 | Washakie Oil Company | | Oil & Gas Operator | Dec 1989 |
| 186 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 187 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 188 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Aug 2025 |
| 189 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 190 | Western American Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2024 |
| 191 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 192 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 193 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 194 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 195 | Wyoming Resources Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Oct 2018 |
| 196 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |