| 1501 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 1502 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 1503 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 1504 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1505 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 1506 | Duncan, D. M. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 1998 |
| 1507 | Duncan, Gene L Dba Duncan Oil Co | Salem, IL 62881 | Oil Operator | Dec 2018 |
| 1508 | Duncan, Raymond T | Denver, CO 80210 | Oil & Gas Operator | Feb 1996 |
| 1509 | Duncan-Taylor & Schumacher | | Oil & Gas Operator | Nov 1987 |
| 1510 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 1511 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 1512 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 1513 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 1514 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 1515 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 1516 | Dunham'S Oil, LLC | Eureka, KS 67045 | Oil Operator | Aug 2025 |
| 1517 | Dunhill Expl. & Prod., LLC | | Oil & Gas Operator | Nov 2004 |
| 1518 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 1519 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Feb 2026 |
| 1520 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 1521 | Dunkin Oil And Gas LLC | Wynewood, OK 73098-9196 | Oil Operator | Nov 2025 |
| 1522 | Dunkirk City School District | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 1523 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Oct 2025 |
| 1524 | Dunlap Exploration, Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2016 |
| 1525 | Dunlap Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 1526 | Dunlap Well Service Inc | Haskell, OK 74436 | Oil & Gas Operator | Sep 1993 |
| 1527 | Dunlap, Rodge | Olney, TX 76374 | Oil & Gas Operator | Aug 2002 |
| 1528 | Dunn Energy LLC | Skiatook, OK 74070-4046 | Oil Operator | Sep 2022 |
| 1529 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 1530 | Dunn Joseph L | Washington, PA 15301-6404 | Oil & Gas Operator | Dec 2025 |
| 1531 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 1532 | Dunn'S Oil And Gas Lease Management LLC | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2025 |
| 1533 | Dunne Equities I | | Oil & Gas Operator | Dec 1995 |
| 1534 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 1535 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 1536 | Dunne Investments Operating, Inc. | Wichita, KS 67226 | Oil Operator | Mar 2002 |
| 1537 | Dunne Oil Co. | Wichita, KS 67202 | Oil Operator | Apr 1999 |
| 1538 | Dunne-Gardner Pe | | Oil & Gas Operator | Nov 1992 |
| 1539 | Dunne-Gardner Petroleum, Inc. | Wichita, KS 67202 | Gas Operator | Jun 2022 |
| 1540 | Dunnewold Farms LLC | Clymer, NY 14724 | Gas Operator | Dec 2024 |
| 1541 | Dunsmoor, David E. | Grand Junction, CO 81504 | Oil Operator | Jul 1998 |
| 1542 | Dupke Roger Oil Co Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2004 |
| 1543 | Duplantis Energy, LLC | Pleasanton, TX 78064 | Oil Operator | Feb 2026 |
| 1544 | Dupont Oil Company | | Oil Operator | Feb 1998 |
| 1545 | Dupree And Dupree | | Oil Operator | Dec 1998 |
| 1546 | Durango Energy Inc | Chickasha, OK 73023 | Oil Operator | Dec 1999 |
| 1547 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Dec 2025 |
| 1548 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 1549 | Durango Operating LLC | Madison, MS 39110 | Oil & Gas Operator | Dec 2025 |
| 1550 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Feb 2026 |
| 1551 | Durbin, Ronald R. | Moline, KS 67353 | Oil Operator | Dec 1988 |
| 1552 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 1553 | Duroc Exploration LLC | Bixby, OK 74008 | Oil & Gas Operator | Nov 2025 |
| 1554 | Durossette Bill D | Haskell, OK 74436-1350 | Oil & Gas Operator | Jul 2004 |
| 1555 | Durossette Floyd R | Warner, OK 74469-0548 | Oil & Gas Operator | Apr 2011 |
| 1556 | Durossette Jr Jess | Haskell, OK 74436 | Oil Operator | Mar 2007 |
| 1557 | Durst Oil & Gas, Inc. | Point Pleasant, WV 25550 | Oil & Gas Operator | Dec 2021 |
| 1558 | Durst Oil Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Sep 2000 |
| 1559 | Dust Bowl Oil Company, Inc. | Spencerport, NY 14559 | Oil Operator | Dec 2024 |
| 1560 | Duster Production, Inc. | Refugio, TX 78377 | Oil & Gas Operator | Oct 2011 |
| 1561 | Dustin Energy Inc | Warren, OH 44481 | Oil & Gas Operator | Dec 2024 |
| 1562 | Dustin Enterprise | Olathe, KS 66062 | Oil Operator | Feb 1998 |
| 1563 | Dusty Drilling & Producing Corp | New Lexington, OH 43764-1552 | Oil & Gas Operator | Dec 2005 |
| 1564 | Dutch Ridge Gas Ventures, LLC | Charleston, WV 25339 | Oil & Gas Operator | Dec 2021 |
| 1565 | Dutton Bill J Oi | | Oil & Gas Operator | Oct 1992 |
| 1566 | Duty Oil & Gas Prod Co | Akron, OH 44306 | Oil & Gas Operator | Dec 1997 |
| 1567 | Duval Gas Gathering Corporation | Austin, TX 78711 | Oil & Gas Operator | Feb 2026 |
| 1568 | Dvi | | Oil Operator | Dec 2008 |
| 1569 | Dvy Energy LLC | Hadley, PA 16130-2320 | Oil & Gas Operator | Dec 2025 |
| 1570 | Dwarf Oil Company | | Oil & Gas Operator | Mar 2025 |
| 1571 | Dwayne'S Engineering | | Oil Operator | Nov 2025 |
| 1572 | Dwight A Tipton | Lovington, NM 88260 | Oil & Gas Operator | Apr 2025 |
| 1573 | Dwight Tipton Et Al | Hobbs, NM 88240 | Oil & Gas Operator | Nov 2002 |
| 1574 | DWJS Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Sep 2024 |
| 1575 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Feb 2026 |
| 1576 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 1577 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 1578 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1579 | Dye Walter M | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2022 |
| 1580 | Dye, Jennifer J. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 1581 | Dyer Dale E Dba The Loving Company | Tulsa, OK 74107 | Oil & Gas Operator | Dec 2025 |
| 1582 | Dyer J G | | Oil & Gas Operator | May 1985 |
| 1583 | Dyer, Charles Wilbur | Longton, KS 67352 | Oil Operator | Jul 2025 |
| 1584 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 1585 | Dyersdale Production Co, Inc. | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 1586 | Dykes Oil Co. | | Oil Operator | Dec 2001 |
| 1587 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 1588 | Dynaco, Incorporated | | Oil & Gas Operator | Dec 1980 |
| 1589 | Dynamic Development Inc | | Oil & Gas Operator | Nov 2025 |
| 1590 | Dynamic Exploration PTRS, LLC | | Oil & Gas Operator | Nov 2024 |
| 1591 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 1592 | Dynamic Of Texas, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Aug 2003 |
| 1593 | Dynamic Offshore Res. NS, LLC | Houston, TX 77010 | Oil & Gas Operator | May 2010 |
| 1594 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 1595 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 1596 | Dynamic Production Inc Of Tex | | Gas Operator | Oct 1987 |
| 1597 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 1598 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |
| 1599 | Dyne Oil & Gas,Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2017 |
| 1600 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |