| 1301 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 1302 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 1303 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2025 |
| 1304 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Jan 2025 |
| 1305 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 1306 | Colt Oil LLC | Sapulpa, OK 74066-1010 | Oil Operator | Jan 2025 |
| 1307 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 1308 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 1309 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 1310 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 1311 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Feb 2025 |
| 1312 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Feb 2025 |
| 1313 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 1314 | Comanche Oil & Service LLC | Hominy, OK 73035 | Oil Operator | Jan 2025 |
| 1315 | Comanche Petroleum Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2024 |
| 1316 | Comanche Production Co | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 1317 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 1318 | Combest A L | Purcell, OK 73080-6829 | Oil & Gas Operator | Aug 2021 |
| 1319 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 1320 | Combs Production LLC | Depew, OK 74028-0483 | Oil & Gas Operator | Jan 2025 |
| 1321 | Comdisco Resources Inc | | Oil Operator | Aug 2004 |
| 1322 | Comet Oil Company | Velma, OK 73091 | Oil & Gas Operator | May 2005 |
| 1323 | Comet-Haines Oil Company | Sulphur, OK 73086-0546 | Oil & Gas Operator | Mar 2013 |
| 1324 | Command Energy Operating LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2025 |
| 1325 | Compadre Drilling & Expl Corp | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2015 |
| 1326 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 1327 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 1328 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 1329 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 1330 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 1331 | Concord Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2021 |
| 1332 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Apr 2025 |
| 1333 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2025 |
| 1334 | Condrin Oil 1985-A LTD | Tulsa, OK 74136 | Oil & Gas Operator | Nov 1998 |
| 1335 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 1336 | Confederate Bay LLC | Okemah, OK 74859 | Oil & Gas Operator | Jan 2025 |
| 1337 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 1338 | Conklin Robert L Dba Conklin Oil LLC | Tulsa, OK 74153 | Oil Operator | Jan 2025 |
| 1339 | Conley Oil Co | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 1340 | Conn-Okla Producing Co Inc | | Oil & Gas Operator | Nov 1992 |
| 1341 | Conner Family Limited Partnership | Humble, TX 77338 | Oil & Gas Operator | Jan 2025 |
| 1342 | Conner Jelly | Seminole, OK 74868 | Oil & Gas Operator | Mar 1996 |
| 1343 | Conner Production Co LLC | Seminole, OK 74868 | Oil & Gas Operator | Jan 2025 |
| 1344 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 1345 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 1346 | Consol Oil Recvry/Ener Co Inc | Cushing, OK 74023 | Oil Operator | Nov 1993 |
| 1347 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 1348 | Consolidated Investments | Seminole, OK 74868 | Oil & Gas Operator | Jan 2025 |
| 1349 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 1350 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 1351 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 1352 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 1353 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Feb 2025 |
| 1354 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 1355 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 1356 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Feb 2025 |
| 1357 | Continental Exploration, L.L.C. | Lufkin, TX 75915 | Oil & Gas Operator | Apr 2025 |
| 1358 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 1359 | Continental Natural Gas, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Jun 2018 |
| 1360 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 1361 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 1362 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 1363 | Continuum Midstream LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2024 |
| 1364 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 1365 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 1366 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 1367 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 1368 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 1369 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 1370 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 1371 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 1372 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 1373 | Coon Creek Transmission LLC | Barnsdall, OK 74002 | Oil & Gas Operator | May 2018 |
| 1374 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 1375 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 1376 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 1377 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 1378 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 1379 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 1380 | Cooper Operating LLC | Yukon, OK 73099 | Oil & Gas Operator | Feb 2025 |
| 1381 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 1382 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 1383 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 1384 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jan 2025 |
| 1385 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 1386 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Jan 2025 |
| 1387 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 1388 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 1389 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 1390 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 1391 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Feb 2025 |
| 1392 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 1393 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 1394 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jan 2025 |
| 1395 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 1396 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 1397 | Cornelius Petroleum Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 1398 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 1399 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Dec 2024 |
| 1400 | Cornell Glen R | Pauls Valley, OK 73075-9606 | Oil & Gas Operator | Oct 2013 |