| 701 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Jun 2026 |
| 702 | M & L Drilling Co | Utica, OH 43080 | Oil & Gas Operator | Dec 1992 |
| 703 | M & M Resources Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 704 | M & M Royalty LTD | North Canton, OH 44720 | Oil & Gas Operator | Dec 2016 |
| 705 | M & R Investments Ohio LLC | Birmingham, AL 35238 | Oil & Gas Operator | Dec 2019 |
| 706 | M & S Oil Co | Lawrenceburg, IN 47025-8675 | Oil & Gas Operator | Aug 2000 |
| 707 | M C F Oil Co Inc | Dellroy, OH 44620 | Oil & Gas Operator | Dec 1995 |
| 708 | M S Exploration Inc | Lexington, OH 44904-9510 | Oil & Gas Operator | Dec 1999 |
| 709 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Jun 2026 |
| 710 | M-J Oil Company Inc. | Minerva, OH 44657 | Oil & Gas Operator | Dec 2008 |
| 711 | Mac Oil Field Service Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2025 |
| 712 | Mackenco Inc | Columbus, OH 43235 | Oil & Gas Operator | Dec 2020 |
| 713 | Madco Energy Corp | Logan, OH 43138 | Oil & Gas Operator | Dec 1987 |
| 714 | Mainspring LLC | Uhrichsville, OH 44683 | Oil & Gas Operator | Dec 2024 |
| 715 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 716 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 717 | Malvern Group Inc | Clearwater, FL 33758-6817 | Oil & Gas Operator | Mar 2005 |
| 718 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 719 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 720 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2025 |
| 721 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 722 | Marden Petroleum Exp Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 723 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 724 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2025 |
| 725 | Marietta Royalty Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | Dec 1986 |
| 726 | Marion Operating Corp | Marion, OH 43301 | Oil & Gas Operator | Dec 2020 |
| 727 | Marjac Energy Co | Bremen, OH 43107 | Oil & Gas Operator | Dec 1986 |
| 728 | Mark Producing Inc | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 729 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 730 | Marksmen Energy USA Inc | Worthington, OH 43085-1270 | Oil Operator | Dec 2024 |
| 731 | Marline Oil Corp | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 732 | Marshall Oil LLC | Eureka, KS 67045 | Oil Operator | Feb 2026 |
| 733 | Marshall Richard R | Jeromesville, OH 44840 | Oil & Gas Operator | Dec 2023 |
| 734 | Martin Larrey C | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 735 | Mason Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2024 |
| 736 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 737 | Mason Producing Inc | Millersburg, OH 44654-2696 | Oil & Gas Operator | Dec 2025 |
| 738 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 739 | McCandlish R L Oil Co Inc | Bremen, OH 43107 | Oil & Gas Operator | Dec 1997 |
| 740 | McClain Oil Co | Granville, OH 43023 | Oil & Gas Operator | Dec 1988 |
| 741 | McCort Brian L | Malaga, OH 43757 | Oil & Gas Operator | Dec 2025 |
| 742 | McDonald Dale E | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2025 |
| 743 | McGonagill J W | MT Gilead, OH 43338 | Oil Operator | Dec 1984 |
| 744 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 745 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2024 |
| 746 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 747 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 748 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 749 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 750 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 751 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 752 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Feb 2026 |
| 753 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2025 |
| 754 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2025 |
| 755 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2025 |
| 756 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 757 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2025 |
| 758 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 759 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 760 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2025 |
| 761 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2025 |
| 762 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 763 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061 | Oil & Gas Operator | Dec 2001 |
| 764 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Apr 2026 |
| 765 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 766 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 767 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 768 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 769 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 770 | Midwest Exploration Inc | Villa Park, IL 60181 | Oil & Gas Operator | Dec 1990 |
| 771 | Midwest Oil & Gas | Columbus, OH 43220-1836 | Oil & Gas Operator | Dec 2021 |
| 772 | Mihalik Paul | Madison, OH 44057 | Oil & Gas Operator | Dec 2025 |
| 773 | Miller Oil & Gas | Dundee, OH 44624-9629 | Oil & Gas Operator | Dec 1998 |
| 774 | Miller Roy/R A Miller Energy LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2025 |
| 775 | Miller William P Jr | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1997 |
| 776 | Mint Mining LLC | Columbus, OH 43214 | Oil Operator | Dec 2025 |
| 777 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 778 | Mke Producing Inc | Canton, OH 44735 | Oil & Gas Operator | Dec 2025 |
| 779 | Mobreal Oil Inc | Wilmington, DE 19808 | Oil & Gas Operator | Dec 1989 |
| 780 | Monday Creek Resources LTD | Logan, OH 43138 | Oil Operator | Dec 2025 |
| 781 | Moore & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1993 |
| 782 | Moore DRLG LLC | MT Vernon, OH 43050 | Oil Operator | Dec 2025 |
| 783 | Moore Michael | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2013 |
| 784 | Moore Resources LLC | Mogadore, OH 44260 | Oil & Gas Operator | Dec 2025 |
| 785 | Moore Well Services Inc | Mogadore, OH 44260 | Oil & Gas Operator | Dec 2025 |
| 786 | Morain Coating & Construc | Niles, OH 44446 | Oil & Gas Operator | Dec 1997 |
| 787 | Moran James R | Frazeysburg, OH 43822 | Oil Operator | Dec 2017 |
| 788 | Moran Oil Partners LLC | Utica, OH 43080 | Oil Operator | Dec 2025 |
| 789 | Moran Ronald F | Frazeysburgysburg, OH 43822 | Oil & Gas Operator | Dec 2025 |
| 790 | Moran Sherman Dean | Utica, OH 43080 | Oil & Gas Operator | Dec 2025 |
| 791 | Moran Well Service Inc. | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 792 | Moreland Oil & Gas Inc | Dennison, OH 44621 | Oil & Gas Operator | Dec 1990 |
| 793 | Morgan Pennington Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1990 |
| 794 | Mormack Ind Inc | Orrville, OH 44667 | Oil & Gas Operator | Dec 2025 |
| 795 | Morrows Stoney Point Farm Inc | New Concord, OH 43762 | Oil & Gas Operator | Dec 2017 |
| 796 | Mossholder Drilling Co | Newark, OH 43055 | Oil Operator | Dec 1990 |
| 797 | Mossholder Linda Dba | Newark, OH 43055 | Oil & Gas Operator | Dec 2015 |
| 798 | Mount Richard | Newark, OH 43055 | Oil Operator | Dec 2005 |
| 799 | Mountaineer State Operations, LLC | Sandyville, WV 25275 | Oil & Gas Operator | Dec 2025 |
| 800 | Mourning James & Carol | Middleport, OH 45760-1214 | Gas Operator | Dec 2024 |