| 18601 | Mannon L. Walters, Inc. | | Oil & Gas Operator | Jun 2024 |
| 18602 | Manns' Atp, Inc. | Potwin, KS 67123 | Oil Operator | Jun 2025 |
| 18603 | Manolo Energy, Inc. | | Oil Operator | Sep 1996 |
| 18604 | Manorado Oil Company | | Oil Operator | Feb 1999 |
| 18605 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 18606 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 18607 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 18608 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Feb 2026 |
| 18609 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 18610 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Feb 2026 |
| 18611 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 18612 | Manufacturers Light & Heat Co | Pittsburgh, PA 15219 | Gas Operator | Dec 1986 |
| 18613 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 18614 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 18615 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 18616 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 18617 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 18618 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 18619 | Manzano, LLC | Roswell, NM 88202 | Oil & Gas Operator | Feb 2026 |
| 18620 | Manziel Interests | Tyler, TX 75711 | Oil & Gas Operator | Jun 2004 |
| 18621 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 18622 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 18623 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 18624 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 18625 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 18626 | Mapco Inc | Billings, MT 59102 | Oil & Gas Operator | Dec 1983 |
| 18627 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 18628 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 18629 | Mapco Prod Compa | | Gas Operator | Dec 1984 |
| 18630 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 18631 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 18632 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2025 |
| 18633 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 18634 | Maple Lane Farms Dairy And Grain LLC | Marietta, NY 13110 | Gas Operator | Dec 2024 |
| 18635 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 18636 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 18637 | Mapleton Gas Pipeline, Inc. | Mapleton, KS 66754 | Gas Operator | Jun 2011 |
| 18638 | Mar Oil & Gas Corp. | Santa Fe, NM 87502 | Oil & Gas Operator | Dec 2025 |
| 18639 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 18640 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Nov 2025 |
| 18641 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 18642 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Sep 2025 |
| 18643 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 18644 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 18645 | Mar/Reg Investments | Irving, TX 75016 | Oil & Gas Operator | Jul 1999 |
| 18646 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | Dec 2025 |
| 18647 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Dec 2025 |
| 18648 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 18649 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 18650 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 18651 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 18652 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |
| 18653 | Maranatha Energy Corporation | Athens, WV 24712 | Oil & Gas Operator | Dec 2021 |
| 18654 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 18655 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 18656 | Maranatha Oil Company | Gonzales, TX 78629 | Oil & Gas Operator | Feb 2026 |
| 18657 | Maranatha Petroleum Inc. | | Oil & Gas Operator | Nov 2025 |
| 18658 | Marata Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 18659 | Marathon Corporation | | Oil Operator | Dec 1994 |
| 18660 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 18661 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 18662 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 18663 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 18664 | Marathon Oil Company Operator | | Oil & Gas Operator | Dec 1993 |
| 18665 | Marathon Oil Company/Fina | | Oil & Gas Operator | Jan 2005 |
| 18666 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 18667 | Marathon Oil Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 18668 | Marben Corporation | | Oil Operator | Jul 1995 |
| 18669 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Dec 2025 |
| 18670 | Marbil Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jun 2013 |
| 18671 | Marbill Drilling Company | | Gas Operator | Dec 2001 |
| 18672 | Marbob Energy Corp | Artesia, NM 882110227 | Oil & Gas Operator | Oct 2010 |
| 18673 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 18674 | Marco Drilling Inc | Monroeville, PA 15146-0278 | Oil & Gas Operator | Dec 2024 |
| 18675 | Marco Land & Petroleum, Inc. | | Oil & Gas Operator | Jun 2000 |
| 18676 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 18677 | Marco Oil Company | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 18678 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Nov 2025 |
| 18679 | Marco Polo Exploration, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | Dec 1993 |
| 18680 | Marco Production | | Oil & Gas Operator | Apr 1986 |
| 18681 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 18682 | Marconi Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 18683 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 18684 | Marcus Exploration Inc | Piedmont, OK 73078-0308 | Oil & Gas Operator | Dec 2000 |
| 18685 | Mardale Drilling Company | Oklahoma City, OK 73157 | Oil Operator | Nov 1998 |
| 18686 | Marden Petroleum Exp Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 18687 | Marden Producing | | Gas Operator | Aug 1990 |
| 18688 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | Sep 2025 |
| 18689 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 18690 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2024 |
| 18691 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 18692 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Sep 2025 |
| 18693 | Margaret Merganser Inc | Tionesta, PA 16353-5853 | Oil & Gas Operator | Dec 2008 |
| 18694 | Maria L. Andrade | | Oil Operator | Dec 2006 |
| 18695 | Mariacher, Matthew | Elma, NY 14059 | Gas Operator | Dec 2023 |
| 18696 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 18697 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 18698 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 18699 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 18700 | Marieff Petroleum, Inc. | Sagamore Hills, OH 44067 | Gas Operator | Dec 2024 |