| 101 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 102 | Kenai Oil & Gas Inc | | Oil & Gas Operator | Jun 1987 |
| 103 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 104 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 105 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 106 | Krejci Harry L | | Oil & Gas Operator | Jan 2026 |
| 107 | L & J Operating Inc | Gillette, WY 82718 | Oil & Gas Operator | Aug 2016 |
| 108 | L R Company | Casper, WY 82602 | Oil & Gas Operator | Sep 2007 |
| 109 | Lear Petroleum Exploration | | Oil & Gas Operator | Jul 2013 |
| 110 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 111 | Lusk Operating LLC | Denver, CO 80202 | Oil Operator | Jun 2017 |
| 112 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | Feb 2026 |
| 113 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 114 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 115 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 116 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 117 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 118 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 119 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 120 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 121 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 122 | Millennium Oil & Gas LLC | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 123 | Morgan Energy Corporation | Englewood, CO 80110 | Oil & Gas Operator | Mar 2006 |
| 124 | Mosbacher Production Co. | Houston, TX 77001 | Oil & Gas Operator | Aug 1984 |
| 125 | Murphy D V | | Oil Operator | Dec 1989 |
| 126 | Murphy Sheldon L & Loretta | Newcastle, WY 82701 | Oil & Gas Operator | Jan 2026 |
| 127 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 128 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 129 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2026 |
| 130 | North Finn LLC | Casper, WY 82605 | Oil & Gas Operator | Feb 2026 |
| 131 | Nova Petroleum Cororation | | Oil & Gas Operator | Mar 1987 |
| 132 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Apr 2026 |
| 133 | Oedekoven Water & Hot Oil | Recluse, WY 82725 | Oil & Gas Operator | Feb 2026 |
| 134 | Okt Petroleum Company Inc | Oklahoma City, OK 73118-7425 | Oil & Gas Operator | Oct 2013 |
| 135 | Olympic Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2004 |
| 136 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 137 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 138 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 139 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 140 | Pajaro Energy LLC | Santa Fe, NM 87501 | Oil & Gas Operator | Dec 2023 |
| 141 | Par Oil Company Inc | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 142 | Park Oil Properties LLC | Plano, TX 75025 | Oil Operator | Oct 2019 |
| 143 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 144 | Petcon Associates LTD | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 145 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 146 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 1998 |
| 147 | PGC LLC | Newcastle, WY 92701 | Oil Operator | Oct 2023 |
| 148 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2025 |
| 149 | Poc-I LLC | Casper, WY 82605 | Oil & Gas Operator | Feb 2026 |
| 150 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 151 | Powder River Petroleum | Boerne, TX 78006 | Oil & Gas Operator | Dec 1998 |
| 152 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 153 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 154 | Rathpro Inc | Douglas, WY 82633 | Oil & Gas Operator | Feb 1994 |
| 155 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Feb 2026 |
| 156 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 157 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Feb 2026 |
| 158 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2026 |
| 159 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2026 |
| 160 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 161 | Royal Oil LLC | Flower Mound, TX 75028 | Oil Operator | Dec 2015 |
| 162 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Apr 2026 |
| 163 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 164 | Seedy Draw LLC | Greenwood VIllage, CO 80111 | Oil Operator | Jan 2026 |
| 165 | Seer Operating LLC | Sheridan, WY 82801 | Oil & Gas Operator | Oct 2016 |
| 166 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 167 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 168 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 169 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2026 |
| 170 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Feb 2026 |
| 171 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 172 | Smith Al | Duncan, OK 73534-0037 | Oil Operator | Dec 1998 |
| 173 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 174 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 175 | Sooner Operating Co Inc | Casper, WY 83602 | Oil Operator | Feb 2026 |
| 176 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 177 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 178 | Stone & Wolf LLC | Sheridan, WY 82801 | Oil & Gas Operator | Dec 2006 |
| 179 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 180 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Feb 2026 |
| 181 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 182 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 183 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 184 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 185 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Apr 2026 |
| 186 | Thunder Basin Resources LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2023 |
| 187 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 188 | Toco Corporation | | Oil & Gas Operator | Oct 1991 |
| 189 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 190 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 191 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Feb 2026 |
| 192 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2025 |
| 193 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 194 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | Jan 2026 |
| 195 | Vermilion Energy USA LLC | | Oil & Gas Operator | Jul 2025 |
| 196 | Walker L Willis | | Oil Operator | Dec 1985 |
| 197 | Washakie Oil Company | | Oil & Gas Operator | Dec 1989 |
| 198 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 199 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 200 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Feb 2026 |