| 1 | M & A Well Service, Inc. | Arnoldsburg, WV 25234-0000 | Oil & Gas Operator | Dec 2021 |
| 2 | M & M Drilling | Spencer, WV 25276-0905 | Oil & Gas Operator | Dec 2021 |
| 3 | M V Crum Gas Partners | Paintsville, KY 41240 | Gas Operator | Dec 2021 |
| 4 | M4 Energy, LLC | Watsontown, PA 17777-1133 | Oil & Gas Operator | Dec 2025 |
| 5 | Macfarlan Oil And Gas, LLC | Ellenboro, WV 26346-0058 | Oil & Gas Operator | Dec 2021 |
| 6 | Mae Gas Co. | Barboursville, WV 25504-0000 | Gas Operator | Nov 1997 |
| 7 | Mahue Construction Company | Huntington, WV 25724-2345 | Oil & Gas Operator | Dec 2021 |
| 8 | Malvern Group Inc | Clearwater, FL 33758-6817 | Oil & Gas Operator | Mar 2005 |
| 9 | Mann Energy, Inc. | Charleston, WV 25332-3242 | Oil & Gas Operator | Nov 2018 |
| 10 | Maranatha Energy Corporation | Athens, WV 24712 | Oil & Gas Operator | Dec 2021 |
| 11 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 12 | Marbill Drilling Company | | Gas Operator | Dec 2001 |
| 13 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 14 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Sep 2025 |
| 15 | Marshall, Dale | | Gas Operator | Dec 1995 |
| 16 | Massey Group, Inc. | | Oil & Gas Operator | Dec 2004 |
| 17 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 18 | Mayle, James | Philippi, WV 26416 | Gas Operator | Dec 2008 |
| 19 | McCarty, Charles E | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 20 | McCullough, Richard F. | Pennsboro, WV 26415 | Oil & Gas Operator | Dec 2021 |
| 21 | MCF Co. | | Oil & Gas Operator | Dec 2011 |
| 22 | McIntosh Oil & Gas, Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 23 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 24 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 25 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 26 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 27 | Megan Oil & Gas Co., Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 28 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 29 | Mert Development Inc | | Oil & Gas Operator | Dec 2021 |
| 30 | Micoa, Inc | | Oil & Gas Operator | Dec 2008 |
| 31 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 32 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 33 | Midway City Gas Company | Huntington, WV 25701 | Oil & Gas Operator | Dec 2018 |
| 34 | Miller, Allerton | | Oil & Gas Operator | Dec 1997 |
| 35 | Mills Drilling Co Inc | | Oil & Gas Operator | Nov 2008 |
| 36 | Milton Oil & Gas Company | Charleston, WV 25322 | Gas Operator | Nov 1997 |
| 37 | Mineral Resource Management, L.L.C. | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2021 |
| 38 | MLX Operating, Inc. | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 39 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 40 | Montlar Oil | Spencer, WV 25276-0000 | Gas Operator | Dec 2020 |
| 41 | Moody Oil & Gas Co. | Bridgeport, WV 26330-1051 | Oil & Gas Operator | Dec 2004 |
| 42 | Moore, Emmett C | | Oil & Gas Operator | Dec 1996 |
| 43 | Morris Beall Oil & Gas Co | | Oil & Gas Operator | Dec 2021 |
| 44 | Morris Oil & Gas Co., Inc | | Oil & Gas Operator | Dec 2021 |
| 45 | Morris, Carl R | | Oil & Gas Operator | Dec 2015 |
| 46 | Moses Gas, Inc. | Indore, WV 25111-0100 | Gas Operator | Dec 2018 |
| 47 | Moses, George W. | | Gas Operator | Nov 2009 |
| 48 | Mossor, L. E. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2002 |
| 49 | Motto Energy Inc. | Normantown, WV 25267-8215 | Oil & Gas Operator | Dec 2021 |
| 50 | Mountain State Oil Company, L..L.C. | Pennsboro, WV 26415-0014 | Oil & Gas Operator | Dec 2021 |
| 51 | Mountain State Well Tending | Hurricane, WV 25526-0000 | Oil & Gas Operator | Dec 2021 |
| 52 | Mountain V Oil & Gas, Inc. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 53 | Mountain V, LLC | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 54 | Mountaineer Gas Transmission, Inc. | Fort Worth, TX 76185-0000 | Oil & Gas Operator | Dec 2021 |
| 55 | Mountaineer Oil & Gas, LLC | | Oil & Gas Operator | Dec 2020 |
| 56 | Mountaineer State Energy, Inc. | Dallas, TX 75234 | Oil & Gas Operator | Dec 2021 |
| 57 | Mountaineer State Operations, LLC | Sandyville, WV 25275 | Oil & Gas Operator | Dec 2024 |
| 58 | Mountaineer Trading Company, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2016 |
| 59 | Mullen Resources LLC | Reedy, WV 25270 | Oil & Gas Operator | Dec 2021 |
| 60 | Mumma Oil Production Co., Inc. | Allentown, PA 18109-0000 | Oil & Gas Operator | Dec 2019 |
| 61 | Murray Hill Energy, Inc. | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2017 |
| 62 | Murvin & Meier Oil Co. | | Oil & Gas Operator | Dec 2020 |
| 63 | Mutschelknaus, Clarence W | Salem, WV 26426-0351 | Oil & Gas Operator | Dec 2021 |
| 64 | Mutual Oil & Gas Co | Akron, OH 44311 | Oil & Gas Operator | Dec 2000 |
| 65 | Myers Drilling Company | Barboursville, WV 25504 | Oil & Gas Operator | Dec 2024 |