| 8501 | Drum Energy Corp | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 8502 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 8503 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Jul 2025 |
| 8504 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 8505 | Drummond Upstream LLC | Tulsa, OK 74104 | Oil & Gas Operator | Apr 2025 |
| 8506 | Drummond, F F | | Oil Operator | Apr 2025 |
| 8507 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2025 |
| 8508 | Dry Coulee Oil & Gas Company | Oilmont, MT 59466 | Oil Operator | Oct 2003 |
| 8509 | Dry Creek Disposal Company, Inc. | | Oil & Gas Operator | Nov 2021 |
| 8510 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2025 |
| 8511 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 8512 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 8513 | Dry Hole Producing LLC | Poland, OH 44514 | Oil & Gas Operator | Dec 2024 |
| 8514 | Dry Hole Producing LP | Poland, OH 44514-3631 | Oil & Gas Operator | Dec 2019 |
| 8515 | Dryes Corner LLC | Crescent, OK 73028 | Oil Operator | Apr 2025 |
| 8516 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 8517 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 8518 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 8519 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 8520 | DSW Production Corp. | Houston, TX 77265 | Oil & Gas Operator | Jul 2025 |
| 8521 | DSX Operating Co. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2008 |
| 8522 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 8523 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 8524 | Du Pont Oil Comp | | Oil Operator | May 1984 |
| 8525 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 8526 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 8527 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Jul 2025 |
| 8528 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Jul 2025 |
| 8529 | Duane Exploration Limited | Andover, KS 67002 | Oil Operator | Jul 1996 |
| 8530 | Dubach Gas Company | | Oil Operator | May 2003 |
| 8531 | Dubisz, Richard And Deborah | East Aurora, NY 14052 | Gas Operator | Dec 2024 |
| 8532 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | May 2025 |
| 8533 | Dubois, Allen | Whitewater, KS 67154 | Oil Operator | May 2000 |
| 8534 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 8535 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | May 2025 |
| 8536 | Duck Creek Energy Inc | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2024 |
| 8537 | Duck Creek Petroleum LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2012 |
| 8538 | Duck Oil Company LLC | Konawa, OK 74849 | Oil Operator | Apr 2025 |
| 8539 | Duck Production Management LLC | Konawa, OK 74849 | Oil Operator | May 2025 |
| 8540 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Jul 2025 |
| 8541 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 8542 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 8543 | Duderstadt, A. R. | Boling, TX 77420 | Oil & Gas Operator | Jul 2025 |
| 8544 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 8545 | Dudrey Carl | | Oil & Gas Operator | Feb 1993 |
| 8546 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 8547 | Duerfeldt | | Oil Operator | Dec 2024 |
| 8548 | Duff Oil Co | | Oil & Gas Operator | Aug 2000 |
| 8549 | Duffer William R | Edmond, OK 73034-6761 | Oil & Gas Operator | Aug 2018 |
| 8550 | Duffield, Scott | | Gas Operator | Dec 2021 |
| 8551 | Dugan Evan | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2024 |
| 8552 | Dugan Guy E | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2015 |
| 8553 | Dugan Harry Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1993 |
| 8554 | Dugan Oil And Gas LLC | Walhonding, OH 43843-9612 | Oil & Gas Operator | Dec 2024 |
| 8555 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | May 2025 |
| 8556 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 8557 | Dugger, Glenn | Alice, TX 78332 | Oil & Gas Operator | Nov 2013 |
| 8558 | Duggins Equipment Inc | Woodward, OK 73802-1213 | Gas Operator | Apr 2025 |
| 8559 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 8560 | Duink, Darryl | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 8561 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 8562 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 8563 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 8564 | Duke Gas Company LLC | | Gas Operator | May 2025 |
| 8565 | Duke Oil & Gas Company, LLC | Wellsville, KS 66092 | Oil Operator | Mar 2025 |
| 8566 | Duke Oil & Gas Inc | Colorado City, TX 79512 | Oil & Gas Operator | May 2003 |
| 8567 | Duke Oil LLC | Garnett, KS 66032 | Oil Operator | Mar 2025 |
| 8568 | Duke Operating Company | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 8569 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 8570 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 8571 | Dukes T F | | Oil & Gas Operator | Apr 2007 |
| 8572 | Dula Production, LLC | Stockdale, TX 78160 | Oil Operator | Jul 2025 |
| 8573 | Dunamis Energy Operating LLC | | Oil & Gas Operator | Apr 2025 |
| 8574 | Dunbar & Son Oil | | Oil & Gas Operator | Oct 1988 |
| 8575 | Dunbar, Ron, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2012 |
| 8576 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 8577 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 8578 | Duncan Energy Companyuncan Energy Company | Denver, CO 80210 | Oil & Gas Operator | Jun 1995 |
| 8579 | Duncan Energy LLC | Dallas, TX 75231 | Oil & Gas Operator | Jul 2025 |
| 8580 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 8581 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 8582 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 8583 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 8584 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 8585 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 8586 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 8587 | Duncan, Gene L Dba Duncan Oil Co | Salem, IL 62881 | Oil Operator | Dec 2018 |
| 8588 | Duncan, Raymond T | Denver, CO 80210 | Oil & Gas Operator | Feb 1996 |
| 8589 | Duncan-Taylor & Schumacher | | Oil & Gas Operator | Nov 1987 |
| 8590 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 8591 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 8592 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 8593 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 8594 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 8595 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 8596 | Dunham'S Oil, LLC | Eureka, KS 67045 | Oil Operator | Mar 2025 |
| 8597 | Dunhill Expl. & Prod., LLC | | Oil & Gas Operator | Nov 2004 |
| 8598 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 8599 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Jul 2025 |
| 8600 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |