| 101 | Breitling Operating Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2016 |
| 102 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 103 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 104 | BRG Production Company | Tulsa, OK 74136-6338 | Oil & Gas Operator | May 2025 |
| 105 | Briscoe Oil Company | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Apr 2014 |
| 106 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 107 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 108 | Bromar Oil Company | Fairview, OK 73737-0006 | Oil & Gas Operator | Apr 2014 |
| 109 | Brooks E L | Edmond, OK 73034-6882 | Oil & Gas Operator | May 2009 |
| 110 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 111 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Jul 2025 |
| 112 | Brown Jeff J Dba Brown Service Co | Enid, OK 73701 | Oil & Gas Operator | May 2025 |
| 113 | Bryant Joe | Helena, OK 73741 | Oil & Gas Operator | Apr 1998 |
| 114 | Buchanan Wayman W | San Antonio, TX 78212 | Oil & Gas Operator | Sep 1990 |
| 115 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 116 | Burkhart Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2002 |
| 117 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Jul 2025 |
| 118 | Butkin Oil Company | Duncan, OK 73534-2090 | Oil & Gas Operator | Sep 2021 |
| 119 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 120 | BVD Inc | Yates Center, KS 66783-0194 | Oil & Gas Operator | May 2025 |
| 121 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 122 | Byng Operating LLC | Ada, OK 74820-0677 | Oil & Gas Operator | Apr 2025 |
| 123 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 124 | C & B Oil Company | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 125 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | May 2025 |
| 126 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 127 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | May 2025 |
| 128 | C L & S Oil Company Inc | Perry, OK 73077-0841 | Oil & Gas Operator | Jan 2018 |
| 129 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 130 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 131 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 132 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | May 2025 |
| 133 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 134 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 135 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 136 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 137 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 138 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | May 2025 |
| 139 | Carla Energy Corporation | Oklahoma City, OK 73154-1487 | Oil & Gas Operator | Nov 2014 |
| 140 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Apr 2025 |
| 141 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2025 |
| 142 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 143 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 144 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2025 |
| 145 | Centaur Resources Inc | Oklahoma City, OK 73142-6804 | Oil & Gas Operator | Apr 2025 |
| 146 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 147 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 148 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2025 |
| 149 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 150 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 151 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 152 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | May 2025 |
| 153 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 154 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 155 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | May 2025 |
| 156 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 157 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Apr 2025 |
| 158 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | May 2025 |
| 159 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 160 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 161 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 162 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 163 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 164 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 165 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 166 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 167 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 168 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2025 |
| 169 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 170 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 171 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 172 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 173 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 174 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 175 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 176 | Condrin Oil 1985-A LTD | Tulsa, OK 74136 | Oil & Gas Operator | Nov 1998 |
| 177 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 178 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 179 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 180 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 181 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 182 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 183 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 184 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 185 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 186 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2025 |
| 187 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 188 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 189 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 190 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2025 |
| 191 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 192 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 193 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2025 |
| 194 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 195 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 196 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 197 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 198 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 199 | Culebra Oil & Gas LLC | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2025 |
| 200 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | May 2025 |