| 101 | Capital Pet & Investments Inc | Oklahoma City, OK 73102-7400 | Oil & Gas Operator | Mar 2015 |
| 102 | Capital Programs Company Inc | Addison, TX 75001-6030 | Oil Operator | Jul 2021 |
| 103 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 104 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 105 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 106 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2026 |
| 107 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742 | Oil Operator | Dec 2019 |
| 108 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Jul 2026 |
| 109 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | May 2026 |
| 110 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | May 2026 |
| 111 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2026 |
| 112 | Cardinal River Operating LLC | Oklahoma City, OK 73102-7109 | Oil & Gas Operator | Apr 2026 |
| 113 | Carey Gas Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 1999 |
| 114 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 115 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2026 |
| 116 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | May 2026 |
| 117 | Carla Energy Corporation | Oklahoma City, OK 73154-1487 | Oil & Gas Operator | Nov 2014 |
| 118 | Carlin Oil And Gas Company | Tulsa, OK 74101-1019 | Oil & Gas Operator | May 1992 |
| 119 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 120 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 121 | Carlton, Richard L | | Oil & Gas Operator | Aug 1999 |
| 122 | Carmac Energy Company LLC | Shawnee, OK 74804 | Oil Operator | Apr 2026 |
| 123 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Apr 2026 |
| 124 | Carman C Wilford | | Oil & Gas Operator | Jan 2007 |
| 125 | Carman Frances J | Pawhuska, OK 74056-0101 | Oil & Gas Operator | Aug 2013 |
| 126 | Carman Robert W | Bristow, OK 74010-3454 | Oil & Gas Operator | Apr 2026 |
| 127 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 128 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 129 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 130 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 131 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 132 | Carpenter Luther | Skiatook, OK 74070-9124 | Oil & Gas Operator | Mar 2026 |
| 133 | Carpenter R L | Sapulpa, OK 74067-0452 | Oil Operator | Mar 2007 |
| 134 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 135 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Mar 2026 |
| 136 | Carroll M R Dba Carroll Production Company | Tulsa, OK 74112 | Oil & Gas Operator | May 2026 |
| 137 | Carruth David C Family Trust | Russellville, AR 72811-2061 | Oil Operator | Aug 2002 |
| 138 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Apr 2026 |
| 139 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 140 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 141 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | May 2026 |
| 142 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Apr 2026 |
| 143 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 144 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | May 2026 |
| 145 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Apr 2026 |
| 146 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | May 2026 |
| 147 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 148 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Apr 2026 |
| 149 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2026 |
| 150 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 151 | Caspen Oil, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 152 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 153 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Apr 2026 |
| 154 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Apr 2026 |
| 155 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 156 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 157 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | Apr 2026 |
| 158 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 2026 |
| 159 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 160 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Apr 2026 |
| 161 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 162 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 163 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 164 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 165 | Cayman Exploration Corp | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 166 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 167 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | May 2026 |
| 168 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | May 2026 |
| 169 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 170 | Cbo Oil And Gas, LLC | Stillwater, OK 74075-8793 | Oil & Gas Operator | May 2026 |
| 171 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Apr 2026 |
| 172 | CCS Investments Inc | Bartlesville, OK 74006-1941 | Oil Operator | Apr 2026 |
| 173 | CDG Inc | Sapulpa, OK 74066-6339 | Oil Operator | Oct 2020 |
| 174 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 175 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Jul 2026 |
| 176 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Jul 2026 |
| 177 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 178 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2026 |
| 179 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 180 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | May 2026 |
| 181 | Cemoil Inc | Chickasha, OK 73018 | Oil & Gas Operator | May 2026 |
| 182 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 183 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Apr 2026 |
| 184 | Centaur Resources Inc | Oklahoma City, OK 73142-6804 | Oil & Gas Operator | Apr 2026 |
| 185 | Centennial Resources Inc | Drumright, OK 74030-1234 | Oil & Gas Operator | Dec 2007 |
| 186 | Center Oil Company | Ada, OK 74821-0584 | Oil Operator | May 2003 |
| 187 | Center Production Company LLC | Ada, OK 74820 | Oil Operator | Apr 2026 |
| 188 | Central California Oil Company | Fish Camp, CA 93623 | Oil & Gas Operator | May 2026 |
| 189 | Central Oklahoma Disposal Company | Kingston, OK 73439 | Oil Operator | May 2026 |
| 190 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 191 | Central Transmission Systems Co | | Oil & Gas Operator | Apr 2015 |
| 192 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 193 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 194 | Centurion Oilfield Services LLC | Poteau, OK 74953 | Oil & Gas Operator | May 2026 |
| 195 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 196 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 197 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2026 |
| 198 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | May 2026 |
| 199 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 200 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | May 2026 |