| 1 | M & L Drilling Co | Utica, OH 43080-176-176 | Oil & Gas Operator | Dec 1992 |
| 2 | M & R Investments Ohio LLC | Birmingham, AL 35238 | Oil & Gas Operator | Dec 2019 |
| 3 | M C F Oil Co Inc | Dellroy, OH 44620 | Oil & Gas Operator | Dec 1995 |
| 4 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Apr 2024 |
| 5 | Mackenco Inc | Columbus, OH 43235 | Oil & Gas Operator | Dec 2020 |
| 6 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 7 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 8 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2022 |
| 9 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 10 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 11 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2023 |
| 12 | Marion Operating Corp | Marion, OH 43301-0453-0453 | Oil & Gas Operator | Dec 2020 |
| 13 | Mason Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2021 |
| 14 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 15 | Mason Producing Inc | Westerville, OH 43086-2696-2696 | Oil & Gas Operator | Dec 2023 |
| 16 | McDonald Dale E | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2022 |
| 17 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 18 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 19 | Meridian Oil & Gas Enter | Blairsville, PA 15717-0337-0337 | Oil & Gas Operator | Dec 2004 |
| 20 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2023 |
| 21 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 22 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 23 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2023 |
| 24 | Midwest Exploration Inc | Villa Park, IL 60181 | Oil & Gas Operator | Dec 1990 |
| 25 | Midwest Oil & Gas | Columbus, OH 43220-1836-1836 | Oil & Gas Operator | Dec 2021 |
| 26 | Miller Oil & Gas | Dundee, OH 44624-9629-9629 | Oil & Gas Operator | Dec 1998 |
| 27 | Miller Roy/R A Miller Energy LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2023 |
| 28 | Mke Producing Inc | Canton, OH 44735 | Oil & Gas Operator | Dec 2023 |
| 29 | Mobreal Oil Inc | Wilmington, DE 19808 | Oil & Gas Operator | Dec 1989 |
| 30 | Moore Well Services Inc | Mogadore, OH 44260 | Oil & Gas Operator | Dec 2023 |
| 31 | Moran Oil Partners LLC | Utica, OH 43080 | Oil Operator | Dec 2023 |
| 32 | Moran Ronald F | Frazeysburgysburg, OH 43822 | Oil & Gas Operator | Dec 2023 |
| 33 | Moran Sherman Dean | Utica, OH 43080 | Oil & Gas Operator | Dec 2023 |
| 34 | Moran Well Service Inc. | Gambier, OH 43022 | Oil & Gas Operator | Dec 2022 |
| 35 | Morgan Pennington Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1990 |
| 36 | Mossholder Drilling Co | Newark, OH 43055 | Oil Operator | Dec 1990 |
| 37 | Mossholder Linda Dba | Newark, OH 43055 | Oil & Gas Operator | Dec 2015 |
| 38 | Mutual Oil & Gas Co | Akron, OH 44313 | Oil & Gas Operator | Dec 2001 |