| 1 | M & R Investments Ohio LLC | Birmingham, AL 35238 | Oil & Gas Operator | Dec 2019 |
| 2 | M & S Oil Co | Lawrenceburg, IN 47025-8675-8675 | Oil & Gas Operator | Aug 2000 |
| 3 | Mackenco Inc | Columbus, OH 43235 | Oil & Gas Operator | Dec 2020 |
| 4 | Marion Operating Corp | Marion, OH 43301-0453-0453 | Oil & Gas Operator | Dec 2020 |
| 5 | Marjac Energy Co | Bremen, OH 43107 | Oil & Gas Operator | Dec 1986 |
| 6 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 7 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |
| 8 | McCandlish R L Oil Co Inc | Bremen, OH 43107 | Oil & Gas Operator | Dec 1997 |
| 9 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 10 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 11 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 12 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2023 |
| 13 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2023 |
| 14 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 15 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2022 |
| 16 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2023 |
| 17 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2023 |
| 18 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2022 |
| 19 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 20 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 21 | Midwest Exploration Inc | Villa Park, IL 60181 | Oil & Gas Operator | Dec 1990 |
| 22 | Midwest Oil & Gas | Columbus, OH 43220-1836-1836 | Oil & Gas Operator | Dec 2021 |
| 23 | Miller William P Jr | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1997 |
| 24 | Mobreal Oil Inc | Wilmington, DE 19808 | Oil & Gas Operator | Dec 1989 |
| 25 | Monday Creek Resources LTD | Logan, OH 43138 | Oil Operator | Dec 2022 |
| 26 | Mossholder Linda Dba | Newark, OH 43055 | Oil & Gas Operator | Dec 2015 |
| 27 | Murphy Oil Company Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2022 |
| 28 | Mutual Oil & Gas Co | Akron, OH 44313 | Oil & Gas Operator | Dec 2001 |