| 1 | M & M Royalty LTD | North Canton, OH 44720 | Oil & Gas Operator | Dec 2016 |
| 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 | Dec 2025 |
| 5 | Mac Oil Field Service Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2024 |
| 6 | Mainspring LLC | Uhrichsville, OH 44683 | Oil & Gas Operator | Dec 2023 |
| 7 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 8 | Malvern Group Inc | Clearwater, FL 33758-6817 | Oil & Gas Operator | Mar 2005 |
| 9 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 10 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 11 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2024 |
| 12 | Mason Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2022 |
| 13 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 14 | Mason Producing Inc | Millersburg, OH 44654-2696 | Oil & Gas Operator | Dec 2024 |
| 15 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 16 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Oct 2025 |
| 17 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 18 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 19 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2024 |
| 20 | Midwest Exploration Inc | Villa Park, IL 60181 | Oil & Gas Operator | Dec 1990 |
| 21 | Miller Oil & Gas | Dundee, OH 44624-9629 | Oil & Gas Operator | Dec 1998 |
| 22 | Miller Roy/R A Miller Energy LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2024 |
| 23 | Mke Producing Inc | Canton, OH 44735 | Oil & Gas Operator | Dec 2024 |
| 24 | Moore DRLG LLC | MT Vernon, OH 43050 | Oil Operator | Dec 2024 |
| 25 | Moore Michael | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2013 |
| 26 | Moran Sherman Dean | Utica, OH 43080 | Oil & Gas Operator | Dec 2024 |
| 27 | Moran Well Service Inc. | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 28 | Moreland Oil & Gas Inc | Dennison, OH 44621 | Oil & Gas Operator | Dec 1990 |
| 29 | Morgan Pennington Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1990 |
| 30 | MS Producing LLC | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 31 | Murphy Oil Company Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2024 |