| 1201 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 1202 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 1203 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 1204 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 2025 |
| 1205 | Cmint Productions LLC | Dallas, TX 75248-2643 | Oil Operator | Oct 2021 |
| 1206 | Cmo LLC | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 1207 | CMR Operating LLC | Tulsa, OK 74135-2653 | Oil & Gas Operator | Jun 2018 |
| 1208 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Jun 2025 |
| 1209 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 1210 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Jun 2025 |
| 1211 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 1212 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Jul 2025 |
| 1213 | CN Operating Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 1214 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 1215 | Coal Oil & Gas Company | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 1216 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 1217 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 1218 | Coast David | Bartlesville, OK 74006-0407 | Oil & Gas Operator | Jun 2025 |
| 1219 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 1220 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 1221 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2025 |
| 1222 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 1223 | Cobalt Environmental Solutions LLC | Oklahoma City, OK 73101-0249 | Oil Operator | Jun 2019 |
| 1224 | Cobopco Inc | Tulsa, OK 74103-4391 | Oil & Gas Operator | Feb 1997 |
| 1225 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 1226 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 1227 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 1228 | Coe Production Company LLC | Talala, OK 74080 | Oil Operator | May 2025 |
| 1229 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 1230 | COG Petroleum Corporation | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2019 |
| 1231 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 1232 | Coker Oil Company | Duncan, OK 73533-0818 | Oil Operator | Jan 2014 |
| 1233 | Cola Resources LLC | Houston, TX 77019-5639 | Gas Operator | Nov 2015 |
| 1234 | Coldren Oil & Gas Inc | Bartlesville, OK 74006-4729 | Oil & Gas Operator | Sep 1998 |
| 1235 | Coleman Oil Company | Bartlesville, OK 74003 | Oil Operator | Dec 2024 |
| 1236 | Coleman Oil LLC | Marlow, OK 73055 | Oil Operator | Nov 2021 |
| 1237 | Coleman Production | Stroud, OK 74079-9609 | Oil & Gas Operator | May 2013 |
| 1238 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 1239 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 1240 | Collins Dillard Dba Dilco Oil Company | Mangum, OK 73554-4029 | Oil & Gas Operator | Mar 2025 |
| 1241 | Collins Petroleum Inc | Bartlesville, OK 74006-7024 | Oil & Gas Operator | Apr 2005 |
| 1242 | Collins, Stephen M | | Oil Operator | Jun 2025 |
| 1243 | Colonial Energy Company Inc | Garland, TN 75045 | Oil & Gas Operator | Apr 2015 |
| 1244 | Colonial Resources LLC | Edmond, OK 73003-3207 | Oil & Gas Operator | Aug 2019 |
| 1245 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 1246 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 1247 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 1248 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Jun 2025 |
| 1249 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Jun 2025 |
| 1250 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 1251 | Colt Oil LLC | Sapulpa, OK 74066-1010 | Oil Operator | Jun 2025 |
| 1252 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 1253 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 1254 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 1255 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 1256 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 1257 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Jul 2025 |
| 1258 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 1259 | Comanche Oil And Service, LLC | | Oil Operator | May 2025 |
| 1260 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 1261 | Comanche Production Co | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 1262 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 1263 | Combest A L | Purcell, OK 73080-6829 | Oil & Gas Operator | Aug 2021 |
| 1264 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 1265 | Combs Production LLC | Depew, OK 74028-0483 | Oil & Gas Operator | Jun 2025 |
| 1266 | Comdisco Resources Inc | | Oil Operator | Aug 2004 |
| 1267 | Comet Oil Company | Velma, OK 73091 | Oil & Gas Operator | May 2005 |
| 1268 | Comet-Haines Oil Company | Sulphur, OK 73086-0546 | Oil & Gas Operator | Mar 2013 |
| 1269 | Command Energy Operating LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 1270 | Compadre Drilling & Expl Corp | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2015 |
| 1271 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 1272 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 1273 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 1274 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 1275 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 1276 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Oct 2025 |
| 1277 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | May 2025 |
| 1278 | Condrin Oil 1985-A LTD | Tulsa, OK 74136 | Oil & Gas Operator | Nov 1998 |
| 1279 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 1280 | Confederate Bay LLC | Okemah, OK 74859 | Oil & Gas Operator | Jun 2025 |
| 1281 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 1282 | Conklin Robert L Dba Conklin Oil LLC | Tulsa, OK 74153 | Oil Operator | May 2025 |
| 1283 | Conley, John | | Oil Operator | Aug 2000 |
| 1284 | Conn-Okla Producing Co Inc | | Oil & Gas Operator | Nov 1992 |
| 1285 | Conner Jelly | Seminole, OK 74868 | Oil & Gas Operator | Mar 1996 |
| 1286 | Conner Production Co LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 1287 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 1288 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 1289 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 1290 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 1291 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 1292 | Consolidated Production Inc. | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 1293 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 1294 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 1295 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Jun 2025 |
| 1296 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 1297 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 1298 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Jun 2025 |
| 1299 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 1300 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |