| 1401 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 1402 | CRD Investments LLC | Duncan, OK 73533-4226 | Oil Operator | Jun 2025 |
| 1403 | Creede Oil & Gas Company | Oklahoma City, OK 73102-7502 | Oil & Gas Operator | Jun 2006 |
| 1404 | Creek Ellis | Haskell, OK 74436 | Oil & Gas Operator | Mar 2012 |
| 1405 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jun 2025 |
| 1406 | Crescent Exploration, LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 1407 | Creslenn Oil Company | | Oil & Gas Operator | Nov 1998 |
| 1408 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 1409 | Crew B Operating, LLC | Okmulgee, OK 74447 | Oil Operator | Jun 2025 |
| 1410 | Cricket Enterprises Corporation | Nowata, OK 74048-9683 | Oil & Gas Operator | Mar 2015 |
| 1411 | Criswell Energy LLC | Montezuma, IA 50171-8500 | Oil & Gas Operator | Oct 2022 |
| 1412 | CRM Energy Partners | | Oil & Gas Operator | Jun 2025 |
| 1413 | Cromer Carroll Oil & Gas LLC | Kalispell, MT 59901 | Oil & Gas Operator | Jun 2025 |
| 1414 | Crooch John | Okmulgee, OK 74447 | Oil Operator | May 2025 |
| 1415 | Cross Don | Cushing, OK 74023-6316 | Oil & Gas Operator | Feb 2022 |
| 1416 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 1417 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 1418 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 1419 | Cross, Don E | | Oil & Gas Operator | Jan 2013 |
| 1420 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 1421 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 1422 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 1423 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 1424 | Crown Consulting, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Jun 2025 |
| 1425 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2025 |
| 1426 | Crown Petroleum Company | Duncan, OK 73534-0938 | Oil & Gas Operator | Jan 2011 |
| 1427 | Crude Oil Recovery Inc /Osage Only | | Oil & Gas Operator | Mar 2006 |
| 1428 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 1429 | Crumpton H A | Duncan, OK 73533 | Oil Operator | Dec 2002 |
| 1430 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 1431 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 1432 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 1433 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 1434 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 1435 | Crusher Oil Company | Ponca City, OK 74604-5612 | Oil Operator | Apr 2017 |
| 1436 | Cruzen Drilling Company Inc | Cleveland, OK 74020-0470 | Oil Operator | Nov 2014 |
| 1437 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 1438 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 1439 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 1440 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 1441 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Jun 2025 |
| 1442 | Culbreath Oil & Gas Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 1443 | Culebra Oil & Gas LLC | Kerrville, TX 78028 | Oil & Gas Operator | Oct 2025 |
| 1444 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 1445 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 1446 | Cummings Gene | | Oil Operator | Dec 2000 |
| 1447 | Cummings Oil & Cattle | Ada, OK 74820-0994 | Oil Operator | Jan 2017 |
| 1448 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Jul 2025 |
| 1449 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |
| 1450 | Cundiff Harold | Perkins, OK 74059-4199 | Oil & Gas Operator | Apr 2025 |
| 1451 | Cundiff Jack | Perkins, OK 74059-4198 | Oil & Gas Operator | Apr 2014 |
| 1452 | Curn Lisa | Steubenville, OH 43952-2535 | Oil Operator | Jun 2025 |
| 1453 | Curran Oil Co | Great Falls, MT 59401 | Gas Operator | May 2001 |
| 1454 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jun 2025 |
| 1455 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 1456 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Jun 2025 |
| 1457 | CWB Energy Inc | Oklahoma City, OK 73139-8837 | Oil Operator | May 2000 |
| 1458 | CX Disposals LLC | Minco, OK 73059-9472 | Oil Operator | Jul 2025 |
| 1459 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 1460 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 1461 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jun 2025 |
| 1462 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 1463 | D & B Johnson Family LLC | Owasso, OK 74055-7578 | Oil Operator | Apr 2025 |
| 1464 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 1465 | D & B Operating LLC | Ringwood, OK 73768 | Oil Operator | Jan 2023 |
| 1466 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 1467 | D & D Drilling | Kingston, OK 73439-9549 | Oil & Gas Operator | May 2000 |
| 1468 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 1469 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Oct 2025 |
| 1470 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 1471 | D & D Services | Cement, OK 73017-9712 | Oil Operator | Feb 2017 |
| 1472 | D & E Oil Co | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 1473 | D & F Oil Company | Dewey, OK 74029 | Oil & Gas Operator | Apr 2001 |
| 1474 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 1475 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 1476 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 1477 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 1478 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 1479 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 1480 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | May 2025 |
| 1481 | D & L Operating LLC | Morris, OK 74445 | Oil & Gas Operator | Jun 2025 |
| 1482 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 1483 | D & P Tank Service, Inc. | | Oil Operator | Mar 2000 |
| 1484 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Oct 2025 |
| 1485 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 1486 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Jun 2025 |
| 1487 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 1488 | D B Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2000 |
| 1489 | D C Energy | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 1490 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 1491 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Oct 2025 |
| 1492 | D O Walker Inc | Stratford, OK 74872 | Oil Operator | Jun 2025 |
| 1493 | D-B-K Operating Company | | Oil Operator | Jan 2006 |
| 1494 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Oct 2025 |
| 1495 | D-Pex Operating Company | | Oil & Gas Operator | Sep 2004 |
| 1496 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Oct 2025 |
| 1497 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 1498 | Dab Limited | Oklahoma City, OK 73116-9082 | Oil & Gas Operator | Aug 2013 |
| 1499 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 1500 | Dahl & Smith Oil Co | Barnsdall, OK 74002 | Oil & Gas Operator | Aug 1999 |