| 1401 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 1402 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 1403 | Crown Consulting Inc | Liberal, KS 67905 | Oil & Gas Operator | Jan 2026 |
| 1404 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 1405 | Crown Petroleum Company | Duncan, OK 73534-0938 | Oil & Gas Operator | Jan 2011 |
| 1406 | Crude Oil Recovery Inc /Osage Only | | Oil & Gas Operator | Mar 2006 |
| 1407 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 1408 | Crumpton H A | Duncan, OK 73533 | Oil Operator | Dec 2002 |
| 1409 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 1410 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 1411 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 1412 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 1413 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 1414 | Crusher Oil Company | Ponca City, OK 74604-5612 | Oil Operator | Apr 2017 |
| 1415 | Cruzen Drilling Company Inc | Cleveland, OK 74020-0470 | Oil Operator | Nov 2014 |
| 1416 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 1417 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 1418 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 1419 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 1420 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Jan 2026 |
| 1421 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2026 |
| 1422 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | May 2026 |
| 1423 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Feb 2026 |
| 1424 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 1425 | Cummings Gene | | Oil Operator | Dec 2000 |
| 1426 | Cummings Oil & Cattle | Ada, OK 74820-0994 | Oil Operator | Jan 2017 |
| 1427 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2026 |
| 1428 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |
| 1429 | Cundiff Harold | Perkins, OK 74059-4199 | Oil & Gas Operator | Dec 2025 |
| 1430 | Cundiff Jack | Perkins, OK 74059-4198 | Oil & Gas Operator | Apr 2014 |
| 1431 | Curn Lisa | Steubenville, OH 43952-2535 | Oil Operator | Dec 2025 |
| 1432 | Curran Oil Co | Great Falls, MT 59401 | Gas Operator | May 2001 |
| 1433 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2026 |
| 1434 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 1435 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Nov 2025 |
| 1436 | CWB Energy Inc | Oklahoma City, OK 73139-8837 | Oil Operator | May 2000 |
| 1437 | CX Disposals LLC | Minco, OK 73059-9472 | Oil Operator | Feb 2026 |
| 1438 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 1439 | Cyanostar Energy Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Feb 1999 |
| 1440 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jan 2026 |
| 1441 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 1442 | D & B Johnson Family LLC | Owasso, OK 74055-7578 | Oil Operator | Apr 2025 |
| 1443 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2026 |
| 1444 | D & B Operating LLC | Ringwood, OK 73768 | Oil Operator | Jan 2023 |
| 1445 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 1446 | D & D Drilling | Kingston, OK 73439-9549 | Oil & Gas Operator | May 2000 |
| 1447 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 1448 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | May 2026 |
| 1449 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 1450 | D & D Services | Cement, OK 73017-9712 | Oil Operator | Feb 2017 |
| 1451 | D & E Oil Co | Perryton, TX 79070 | Oil & Gas Operator | May 2026 |
| 1452 | D & F Oil Company | Dewey, OK 74029 | Oil & Gas Operator | Apr 2001 |
| 1453 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 1454 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 1455 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 1456 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 1457 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | May 2026 |
| 1458 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 1459 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Feb 2026 |
| 1460 | D & L Operating LLC | Morris, OK 74445 | Oil & Gas Operator | Jan 2026 |
| 1461 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 1462 | D & P Tank Service, Inc. | | Oil Operator | Mar 2000 |
| 1463 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | May 2026 |
| 1464 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 1465 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Dec 2025 |
| 1466 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 1467 | D C Energy | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 1468 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 1469 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | May 2026 |
| 1470 | D O Walker Inc | Stratford, OK 74872 | Oil Operator | Jan 2026 |
| 1471 | D-B-K Operating Company | | Oil Operator | Jan 2006 |
| 1472 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | May 2026 |
| 1473 | D-Pex Operating Company | | Oil & Gas Operator | Sep 2004 |
| 1474 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | May 2026 |
| 1475 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 1476 | Dab Limited | Oklahoma City, OK 73116-9082 | Oil & Gas Operator | Aug 2013 |
| 1477 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 1478 | Dahl & Smith Oil Co | Barnsdall, OK 74002 | Oil & Gas Operator | Aug 1999 |
| 1479 | Dahl Randall Lee | Barnsdall, OK 74002 | Oil Operator | Jan 2026 |
| 1480 | Dahl SWD Facility #1 LLC | Oklahoma City, OK 73118 | Gas Operator | Dec 2017 |
| 1481 | Daisy Pointer | | Oil Operator | Jul 1999 |
| 1482 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 1483 | Dakota Oil Company | Hebbronville, TX 78361 | Oil & Gas Operator | May 2026 |
| 1484 | Dalco Petroleum Inc | | Oil & Gas Operator | Jan 2006 |
| 1485 | Dalcor Energy LLC | Duncan, OK 73534 | Oil & Gas Operator | Nov 2025 |
| 1486 | Dale George | Elmore City, OK 73433 | Oil & Gas Operator | Aug 2022 |
| 1487 | Dale Jimmy | Davis, OK 73030 | Oil & Gas Operator | Mar 2015 |
| 1488 | Dalen Resources Oil & Gas Co | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 1489 | Dales Tank Service Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Jan 2026 |
| 1490 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 1491 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 1492 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 1493 | Dance Oil Co | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 1494 | Danco Enterprises Inc | Ada, OK 74820 | Oil Operator | Apr 2008 |
| 1495 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 1496 | Daniel Resource Dev Inc | Tomball, TX 77375-8919 | Oil & Gas Operator | Oct 2009 |
| 1497 | Daniel-Price Exploration Co | Tulsa, OK 74119 | Gas Operator | Apr 2011 |
| 1498 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | May 2026 |
| 1499 | Daniels Danny | Tishomingo, OK 73460-0853 | Oil Operator | Apr 2015 |
| 1500 | Daniels Earlene Inc | Follett, TX 79034-9736 | Oil & Gas Operator | Mar 2015 |