| 1501 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 1502 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 1503 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 1504 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 1505 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Jan 2025 |
| 1506 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2025 |
| 1507 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2025 |
| 1508 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Apr 2022 |
| 1509 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 1510 | Cummings Gene | | Oil Operator | Dec 2000 |
| 1511 | Cummings Oil & Cattle | Ada, OK 74820-0994 | Oil Operator | Jan 2017 |
| 1512 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2025 |
| 1513 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |
| 1514 | Cundiff Harold | Perkins, OK 74059-4199 | Oil & Gas Operator | Jan 2025 |
| 1515 | Cundiff Jack | Perkins, OK 74059-4198 | Oil & Gas Operator | Apr 2014 |
| 1516 | Curn Lisa | Steubenville, OH 43952-2535 | Oil Operator | Dec 2024 |
| 1517 | Curran Oil Co | Great Falls, MT 59401 | Gas Operator | May 2001 |
| 1518 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2025 |
| 1519 | CVR Supply & Trading LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 1520 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Jan 2025 |
| 1521 | CWB Energy Inc | Oklahoma City, OK 73139-8837 | Oil Operator | May 2000 |
| 1522 | CX Disposals LLC | Minco, OK 73059-9472 | Oil Operator | Jan 2025 |
| 1523 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 1524 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 1525 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jan 2025 |
| 1526 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 1527 | D & B Johnson Family LLC | Owasso, OK 74055-7578 | Oil Operator | Dec 2024 |
| 1528 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 1529 | D & B Operating LLC | Ringwood, OK 73768 | Oil Operator | Jan 2023 |
| 1530 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 1531 | D & D Drilling | Kingston, OK 73439-9549 | Oil & Gas Operator | May 2000 |
| 1532 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 1533 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Apr 2025 |
| 1534 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 1535 | D & D Services | Cement, OK 73017-9712 | Oil Operator | Feb 2017 |
| 1536 | D & E Oil Co. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 1537 | D & F Oil Company | Dewey, OK 74029 | Oil & Gas Operator | Apr 2001 |
| 1538 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 1539 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 1540 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 1541 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 1542 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Apr 2025 |
| 1543 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 1544 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Feb 2025 |
| 1545 | D & L Operating LLC | Morris, OK 74445 | Oil & Gas Operator | Jan 2025 |
| 1546 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2025 |
| 1547 | D & P Tank Service, Inc. | | Oil Operator | Mar 2000 |
| 1548 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Apr 2025 |
| 1549 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 1550 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Jan 2025 |
| 1551 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 1552 | D B Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2000 |
| 1553 | D C Energy | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 1554 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 1555 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Apr 2025 |
| 1556 | D O Walker Inc | Stratford, OK 74872 | Oil Operator | Nov 2024 |
| 1557 | D-B-K Operating Company | | Oil Operator | Jan 2006 |
| 1558 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Apr 2025 |
| 1559 | D-Pex Operating Company | | Oil & Gas Operator | Sep 2004 |
| 1560 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2025 |
| 1561 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 1562 | Dab Limited | Oklahoma City, OK 73116-9082 | Oil & Gas Operator | Aug 2013 |
| 1563 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 1564 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 1565 | Dahl & Smith Oil Co | Barnsdall, OK 74002 | Oil & Gas Operator | Aug 1999 |
| 1566 | Dahl Randall Lee | Barnsdall, OK 74002 | Oil Operator | Jan 2025 |
| 1567 | Daisy Pointer | | Oil Operator | Jul 1999 |
| 1568 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 1569 | Dakota Oil Company | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 2025 |
| 1570 | Dalco Petroleum, Inc | | Oil & Gas Operator | Jan 2006 |
| 1571 | Dalcor Energy LLC | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 1572 | Dale George | Elmore City, OK 73433 | Oil & Gas Operator | Aug 2022 |
| 1573 | Dale Jimmy | Davis, OK 73030 | Oil & Gas Operator | Mar 2015 |
| 1574 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 1575 | Dales Tank Truck Service Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Jan 2025 |
| 1576 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 1577 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 1578 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 1579 | Dance Oil Co | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 1580 | Danco Enterprises Inc | Ada, OK 74820 | Oil Operator | Apr 2008 |
| 1581 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 1582 | Daniel Resource Dev Inc | Tomball, TX 77375-8919 | Oil & Gas Operator | Oct 2009 |
| 1583 | Daniel-Price Exploration Co | Tulsa, OK 74119 | Gas Operator | Apr 2011 |
| 1584 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Apr 2025 |
| 1585 | Daniels Danny | Tishomingo, OK 73460-0853 | Oil Operator | Apr 2015 |
| 1586 | Daniels Earlene Inc | Follett, TX 79034-9736 | Oil & Gas Operator | Mar 2015 |
| 1587 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 1588 | Danny Engel Operating LLC | Ada, OK 74820-1388 | Oil Operator | Jan 2025 |
| 1589 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 1590 | Darco Petroleum, Inc. | Bartlesville, OK 74005 | Oil & Gas Operator | Dec 2020 |
| 1591 | Darden Energy Corp | Hennessey, OK 73742 | Oil & Gas Operator | Jul 1999 |
| 1592 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 1593 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Jan 2025 |
| 1594 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 1595 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Feb 2025 |
| 1596 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Apr 2025 |
| 1597 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Jan 2025 |
| 1598 | Darriel C Ray | | Oil Operator | Jun 2020 |
| 1599 | Dart Oil Properties | Enid, OK 73703 | Oil & Gas Operator | Oct 1992 |
| 1600 | Dash Operating LLC | Oklahoma City, OK 73118-5031 | Oil & Gas Operator | Jan 2025 |