| 101 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 102 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 103 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 104 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 105 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 106 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 107 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 108 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 109 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 110 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 111 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 112 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2025 |
| 113 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 114 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 115 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 116 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 117 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 118 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 119 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 120 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 121 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 122 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 123 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Feb 2025 |
| 124 | Crescent Exploration, LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 125 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 126 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 127 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 128 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 129 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 130 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 131 | D & E Oil Co | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 132 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 133 | D.W.P. Production | Perryton, TX 79070 | Oil & Gas Operator | Nov 2020 |
| 134 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 135 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 136 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 137 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | May 2025 |
| 138 | Daniels, J.C. Energy | Pampa, TX 79066 | Oil & Gas Operator | Apr 2001 |
| 139 | Davis, Randy | Perryton, TX 79070 | Oil & Gas Operator | Jun 2017 |
| 140 | Davis, Travis H. | Spearman, TX 79081 | Oil & Gas Operator | Jul 2003 |
| 141 | Davis, Travis H. Gas | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 142 | DBP Exploration, Inc. | Pampa, TX 79065 | Oil & Gas Operator | May 2025 |
| 143 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 144 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 145 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 146 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 147 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 148 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 149 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2025 |
| 150 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 151 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 152 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 153 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 154 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 155 | Eaa Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 156 | Eagle Exploration Co., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2019 |
| 157 | Eagle Operating | Midland, TX 79707 | Oil & Gas Operator | May 2013 |
| 158 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 159 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 160 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 161 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 162 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 163 | Ehrlich, Mitchell | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 164 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 165 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 166 | Empire Operating, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 167 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 168 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2024 |
| 169 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 170 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 171 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 172 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 173 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 174 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 175 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | May 2025 |
| 176 | Estes And Company LLC. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 177 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 178 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 179 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 180 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 181 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 182 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 183 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 184 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 185 | Fairway Resources Op III, LLC | Southlake, TX 76092 | Oil & Gas Operator | May 2025 |
| 186 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 187 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 188 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 189 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 190 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 191 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 192 | Four Aces Company | Borger, TX 79008 | Oil & Gas Operator | Mar 1995 |
| 193 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Feb 2025 |
| 194 | Fourpoint Energy, LLC | Denver, CO 80206 | Oil & Gas Operator | May 2025 |
| 195 | Future Petroleum Company LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2013 |
| 196 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | May 2025 |
| 197 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 198 | G. & S. Inc. | Gruver, TX 79040 | Oil & Gas Operator | Nov 2023 |
| 199 | Gasoil, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Dec 2015 |
| 200 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |