| 8501 | Dreyer Oil - Lel | | Oil Operator | Nov 1993 |
| 8502 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 8503 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Dec 2025 |
| 8504 | DRH Properties LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 8505 | Dri Operating Company | West Chester, PA 19382-0000 | Gas Operator | Dec 2008 |
| 8506 | Driftwood Energy Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2022 |
| 8507 | Driftwood Oil Co. | Russell, KS 67665 | Oil Operator | Jan 1988 |
| 8508 | Driftwood Oil, LLC | Jal, NM 88252 | Oil & Gas Operator | Jan 2026 |
| 8509 | Drilex Oil & Gas | | Oil Operator | Apr 1987 |
| 8510 | Drill Partners Management, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2010 |
| 8511 | Driller'S & Prod | | Oil & Gas Operator | Oct 1994 |
| 8512 | Drillers & Producers, Inc. | Newton, KS 67114 | Oil Operator | Dec 2019 |
| 8513 | Drillers Energy Search, Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 8514 | Drillers LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2024 |
| 8515 | Drillex Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2003 |
| 8516 | Drilling & Production Co. | | Oil & Gas Operator | Dec 2025 |
| 8517 | Drilling Exploration & Operating Co. Inc. | | Oil & Gas Operator | Dec 2025 |
| 8518 | Drilling, Operg & Explor, Inc. | | Oil & Gas Operator | Feb 1990 |
| 8519 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 8520 | Drillmar Operating Company | Houston, TX 77019 | Oil & Gas Operator | Jun 2013 |
| 8521 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Mar 2026 |
| 8522 | Drilmor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 1998 |
| 8523 | Driltrol | | Oil & Gas Operator | Dec 1984 |
| 8524 | Driscoll Jerry J | | Oil Operator | Apr 1994 |
| 8525 | Driscoll Lease O | | Oil Operator | Jul 1988 |
| 8526 | Driscoll Lease Operations, Inc. | Russell, KS 67665 | Oil Operator | Dec 1998 |
| 8527 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Mar 2026 |
| 8528 | Driscoll, Jerry J Oil Investment Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 8529 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 8530 | DRL Operating In | | Oil Operator | Sep 1986 |
| 8531 | Drmas, LLC | | Oil & Gas Operator | Nov 2024 |
| 8532 | Drop Tine Exploration, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2019 |
| 8533 | DRS Exploration Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 1999 |
| 8534 | Drum Energy Corp | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 8535 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 8536 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Mar 2026 |
| 8537 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 8538 | Drummond Upstream LLC | Tulsa, OK 74104 | Oil & Gas Operator | Dec 2025 |
| 8539 | Drummond, F F | | Oil Operator | Dec 2025 |
| 8540 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2026 |
| 8541 | Dry Coulee Oil & Gas Company | Oilmont, MT 59466 | Oil Operator | Oct 2003 |
| 8542 | Dry Creek Disposal Company, Inc. | | Oil & Gas Operator | Nov 2021 |
| 8543 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Mar 2026 |
| 8544 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 8545 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2026 |
| 8546 | Dry Hole Producing LLC | Poland, OH 44514 | Oil & Gas Operator | Dec 2024 |
| 8547 | Dry Hole Producing LP | Poland, OH 44514-3631 | Oil & Gas Operator | Dec 2019 |
| 8548 | Dryes Corner LLC | Oklahoma City, OK 73118 | Oil Operator | Jul 2025 |
| 8549 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2026 |
| 8550 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 8551 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Mar 2026 |
| 8552 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 8553 | DSW Production Corp. | Houston, TX 77265 | Oil & Gas Operator | Mar 2026 |
| 8554 | DSX Operating Co. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2008 |
| 8555 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 8556 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 8557 | Du Pont Oil Comp | | Oil Operator | May 1984 |
| 8558 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 8559 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 8560 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Mar 2026 |
| 8561 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Mar 2026 |
| 8562 | Duane Exploration Limited | Andover, KS 67002 | Oil Operator | Jul 1996 |
| 8563 | Dubach Gas Company | | Oil Operator | May 2003 |
| 8564 | Dubisz, Richard And Deborah | East Aurora, NY 14052 | Gas Operator | Dec 2024 |
| 8565 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Jan 2026 |
| 8566 | Dubois, Allen | Whitewater, KS 67154 | Oil Operator | May 2000 |
| 8567 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 8568 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2025 |
| 8569 | Duck Creek Energy Inc | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2024 |
| 8570 | Duck Creek Petroleum LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2012 |
| 8571 | Duck Oil Company LLC | Konawa, OK 74849 | Oil Operator | Dec 2025 |
| 8572 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Mar 2026 |
| 8573 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 8574 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 8575 | Duderstadt, A. R. | Boling, TX 77420 | Oil & Gas Operator | Mar 2026 |
| 8576 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 8577 | Dudrey Carl | | Oil & Gas Operator | Feb 1993 |
| 8578 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 8579 | Duerfeldt | | Oil Operator | Dec 2024 |
| 8580 | Duff Oil Co | | Oil & Gas Operator | Aug 2000 |
| 8581 | Duffer William R | Edmond, OK 73034-6761 | Oil & Gas Operator | Aug 2018 |
| 8582 | Dugan Evan | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2024 |
| 8583 | Dugan Guy E | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2015 |
| 8584 | Dugan Harry Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1993 |
| 8585 | Dugan Oil And Gas LLC | Walhonding, OH 43843-9612 | Oil & Gas Operator | Dec 2024 |
| 8586 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Jan 2026 |
| 8587 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 8588 | Dugger, Glenn | Alice, TX 78332 | Oil & Gas Operator | Nov 2013 |
| 8589 | Duggins Equipment Inc | Woodward, OK 73802-1213 | Gas Operator | Dec 2025 |
| 8590 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 8591 | Duink, Darryl | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 8592 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 8593 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 8594 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 8595 | Duke Gas Company LLC | | Oil & Gas Operator | Jan 2026 |
| 8596 | Duke Oil & Gas Company, LLC | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 8597 | Duke Oil & Gas Inc | Colorado City, TX 79512 | Oil & Gas Operator | May 2003 |
| 8598 | Duke Oil LLC | Garnett, KS 66032 | Oil Operator | Sep 2025 |
| 8599 | Duke Operating Company | Graham, TX 76450 | Oil Operator | Mar 2026 |
| 8600 | Duke, Hanes Partnership | San Clemente, CA 92672 | Gas Operator | Oct 2004 |