| 101 | Lime Rock Resources V-A, LP | | Oil & Gas Operator | Jan 2025 |
| 102 | Lloyd H. Smith | | Oil & Gas Operator | Mar 1972 |
| 103 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 104 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 105 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 106 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 107 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 108 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Jan 2025 |
| 109 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 110 | Mercury Resources LLC | | Oil & Gas Operator | Jan 2025 |
| 111 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 112 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 113 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 114 | Missouri Breaks, LLC | | Oil & Gas Operator | Jun 2011 |
| 115 | Missouri River Resources ND, LLC | | Oil & Gas Operator | Jan 2025 |
| 116 | Missouri River Royalty Corporation | Bismarck, ND 58504 | Oil & Gas Operator | Jan 2025 |
| 117 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Jan 2025 |
| 118 | Nadel And Gussman Rockies, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2012 |
| 119 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 120 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 121 | Neptune Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 122 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 123 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 124 | Nine Point Energy, LLC | | Oil & Gas Operator | Oct 2021 |
| 125 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 126 | North Plains Energy, LLC | | Oil & Gas Operator | Jan 2016 |
| 127 | North Range Resources, LLC | | Oil & Gas Operator | Nov 2023 |
| 128 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |
| 129 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 130 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 131 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 132 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 133 | Pan American Petroleum Corp | | Oil & Gas Operator | Jan 2008 |
| 134 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 135 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 136 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 137 | Paul Rankin Inc. | | Oil & Gas Operator | Jan 2025 |
| 138 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 139 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 140 | Peregrine Petroleum Partners, LTD | | Oil & Gas Operator | Oct 2021 |
| 141 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 142 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Jan 2025 |
| 143 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 144 | Petroshale (Us) Inc. | | Oil & Gas Operator | Jan 2025 |
| 145 | Phillip D. Armstrong | | Oil & Gas Operator | Sep 2018 |
| 146 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 147 | Pride Energy, An Oklahoma General Partnership | | Oil & Gas Operator | Dec 2020 |
| 148 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Jan 2025 |
| 149 | Primewest Petroleum, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 150 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 151 | Prosper Energy Corporation | | Oil & Gas Operator | Oct 1988 |
| 152 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 153 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 154 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Feb 2025 |
| 155 | Resolute Natural Resources Co., LLC | Denver, CO 80203 | Oil & Gas Operator | Feb 2017 |
| 156 | Rigel, Inc. | | Oil & Gas Operator | Feb 2010 |
| 157 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 158 | Rockport Energy Solutions LLC | Austin, TX 78730 | Oil & Gas Operator | Mar 2025 |
| 159 | Rocky Top Energy LLC | Bartlesville, OK 74003 | Oil & Gas Operator | Sep 2024 |
| 160 | Ronald M. Sannes | | Oil & Gas Operator | Oct 2016 |
| 161 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Mar 2025 |
| 162 | Samson Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 163 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 164 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 165 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 166 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 167 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 168 | Siana Oil & Gas., L.L.C | | Oil & Gas Operator | Dec 2021 |
| 169 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Mar 2025 |
| 170 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 171 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 172 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 173 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Jan 2025 |
| 174 | Spotted Hawk Development, LLC | | Oil & Gas Operator | Jan 2025 |
| 175 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 176 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 177 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 178 | Stearns Oil Company LLC | Willison, ND 58801 | Oil & Gas Operator | Jan 2025 |
| 179 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 180 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 181 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 182 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 183 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 184 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 185 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 186 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 187 | Thunderbird Resources LP | | Oil & Gas Operator | Apr 2019 |
| 188 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 189 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 190 | Tracker Resource Development II, LLC | | Oil & Gas Operator | Feb 2011 |
| 191 | Traverse Oil Co. | | Oil & Gas Operator | Nov 1983 |
| 192 | Triangle USA Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2021 |
| 193 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 194 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 195 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |
| 196 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 197 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 198 | W. H. Hunt Trust Estate | | Oil & Gas Operator | Mar 1997 |
| 199 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 200 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |