| 1501 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | May 2026 |
| 1502 | Danny Engel Operating LLC | Ada, OK 74820-1388 | Oil Operator | Feb 2026 |
| 1503 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 1504 | Darco Petroleum Inc | Bartlesville, OK 74005 | Oil & Gas Operator | Dec 2020 |
| 1505 | Darden Energy Corp | Hennessey, OK 73742 | Oil & Gas Operator | Jul 1999 |
| 1506 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 1507 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Feb 2026 |
| 1508 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 1509 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Feb 2026 |
| 1510 | Darrah Oil Company, LLC | Wichita, KS 67201 | Oil & Gas Operator | May 2026 |
| 1511 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Jan 2026 |
| 1512 | Darriel C Ray | | Oil Operator | Jun 2020 |
| 1513 | Dart Oil Properties | Enid, OK 73703 | Oil & Gas Operator | Oct 1992 |
| 1514 | Darwin Allen Dba Wil-Mar Operations | Duncan, OK 73534-1566 | Oil & Gas Operator | Oct 2016 |
| 1515 | Dash Operating LLC | Oklahoma City, OK 73118-5031 | Oil & Gas Operator | Dec 2025 |
| 1516 | Data Energy Inc | Evergreen, CO 80439 | Oil & Gas Operator | Jul 2018 |
| 1517 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2026 |
| 1518 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 1519 | Dauco Petroleum Corporation | Rowlett, TX 75089-3066 | Oil & Gas Operator | Jan 2021 |
| 1520 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 1521 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Feb 2026 |
| 1522 | David L Greene II LLC | | Oil Operator | Feb 2026 |
| 1523 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Feb 2026 |
| 1524 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Feb 2026 |
| 1525 | Davidson Gene | Perry, OK 73077-0144 | Oil & Gas Operator | Aug 2014 |
| 1526 | Davies & Company Inc | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2000 |
| 1527 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 1528 | Davis & Davis Oil Properties Inc | Morris, OK 74445 | Oil Operator | Jan 2026 |
| 1529 | Davis & Hamilton Oil Company | Edmond, OK 73083-3670 | Oil Operator | Aug 2022 |
| 1530 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 1531 | Davis Charles K | Morris, OK 74445-2201 | Oil & Gas Operator | Apr 2015 |
| 1532 | Davis Consulting LLC | Tulsa, OK 74104 | Oil Operator | Apr 2024 |
| 1533 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 1534 | Davis Jared | Wann, OK 74083-9610 | Oil & Gas Operator | Jan 2026 |
| 1535 | Davis Jim L | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 1536 | Davis Kendall | Bethany, OK 73008-4714 | Oil Operator | Aug 2016 |
| 1537 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | May 2026 |
| 1538 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 1539 | Davis William W | | Oil Operator | Jun 2024 |
| 1540 | Davis, Joe D. | Fort Smith, AR 72903 | Gas Operator | Mar 2015 |
| 1541 | Davis/Osage Corp | Tulsa, OK 74103 | Oil Operator | Jan 2001 |
| 1542 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 1543 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 1544 | Dawson Geophysical Company | Midland, TX 79701 | Oil Operator | Aug 2024 |
| 1545 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 1546 | Dawson, Levi S | | Oil & Gas Operator | Mar 2015 |
| 1547 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2026 |
| 1548 | Daxin Energy Corporation | Seminole, OK 74868-2208 | Oil Operator | Jan 2013 |
| 1549 | Day Richard H | Wann, OK 74083-9608 | Oil Operator | Mar 2015 |
| 1550 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2026 |
| 1551 | DBS Oil Co /Osage Only | | Oil Operator | Nov 2025 |
| 1552 | Dby Investments LLC | Lago VIsta, TX 78645-8011 | Oil & Gas Operator | Nov 2016 |
| 1553 | DC Operating LLC | Yale, OK 74085-6662 | Oil & Gas Operator | Mar 2020 |
| 1554 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 1555 | DDC Oil LLC | Rockwall, TX 75087-5383 | Oil Operator | Mar 2020 |
| 1556 | DDD Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | May 2026 |
| 1557 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Feb 2026 |
| 1558 | Dead Horse Oil & Gas LLC | Skiatook, OK 74070-9343 | Oil & Gas Operator | Jun 2015 |
| 1559 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Jan 2026 |
| 1560 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 1561 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 1562 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 1563 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 1564 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 1565 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2026 |
| 1566 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 1567 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 1568 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Dec 2025 |
| 1569 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2026 |
| 1570 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Jan 2026 |
| 1571 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 1572 | Delek Energy Systems Us, Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 1573 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 1574 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Jan 2026 |
| 1575 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 1576 | Delong, Ralph S | | Oil & Gas Operator | Jun 2025 |
| 1577 | Delphi Oil And Gas LLC | Macomb, OK 74852 | Oil Operator | Nov 2025 |
| 1578 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 1579 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 1580 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 1581 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Feb 2026 |
| 1582 | Demco Oil & Gas Company | Blackwell, OK 74631-4203 | Oil & Gas Operator | Jan 2026 |
| 1583 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 1584 | Deminex U S Oil Company | | Oil & Gas Operator | Jan 1998 |
| 1585 | Demo Oil Co | | Oil Operator | Jan 2020 |
| 1586 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 1587 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2026 |
| 1588 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 1589 | Dennett'S Inc | Enid, OK 73701-1851 | Oil & Gas Operator | Apr 2014 |
| 1590 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 1591 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | May 2026 |
| 1592 | Dennis Don Oil Company | Grady, OK 73569-9998 | Oil Operator | Jan 2002 |
| 1593 | Dennison George | Tulsa, OK 74112-6732 | Oil & Gas Operator | Apr 2020 |
| 1594 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 1595 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1596 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 1597 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1598 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 1599 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2026 |
| 1600 | Des Oil Inc/Osage Only | | Oil Operator | Nov 1998 |