| 101 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 102 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 103 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 104 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Apr 2025 |
| 105 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 106 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 107 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 108 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Apr 2025 |
| 109 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 110 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 111 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 112 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 113 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 114 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 115 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2025 |
| 116 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 117 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 118 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 119 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 120 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 121 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 122 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 123 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 124 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 125 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 126 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 127 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 128 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 129 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 130 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 131 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 132 | Craw Operating LLC | Mooreland, OK 73852 | Oil & Gas Operator | Apr 2025 |
| 133 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 134 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Apr 2025 |
| 135 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 136 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 137 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 138 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 139 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 140 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 141 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 142 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 143 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | May 2025 |
| 144 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 145 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Jul 2025 |
| 146 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 147 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Jul 2025 |
| 148 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 149 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 150 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | May 2025 |
| 151 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 152 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2025 |
| 153 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 154 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 155 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 156 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 157 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 158 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 159 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 160 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 161 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 162 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 163 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 164 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 165 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 166 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 167 | Dragon Energy LLC | Tulsa, OK 74135-7234 | Oil & Gas Operator | Feb 2015 |
| 168 | Draw Oil & Gas Inc | | Oil & Gas Operator | Jun 1995 |
| 169 | Duggins Equipment Inc | Woodward, OK 73802-1213 | Gas Operator | Apr 2025 |
| 170 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 171 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 172 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2025 |
| 173 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 174 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Apr 2025 |
| 175 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 176 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 177 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 178 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 179 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 180 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 181 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 182 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 183 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 184 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 185 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 186 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 187 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 188 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 189 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 190 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 191 | Fail W T Inc | | Oil & Gas Operator | Mar 2015 |
| 192 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Apr 2025 |
| 193 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 194 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 195 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Jul 2025 |
| 196 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 197 | Ferraro Energy Corporation | Oklahoma City, OK 73114-6629 | Oil & Gas Operator | Aug 2013 |
| 198 | Five Star Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 199 | Fleetwood K Phil Oil Properties | Marlow, OK 73055 | Oil & Gas Operator | Apr 2025 |
| 200 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |