| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M. W. Maxwell | Oil & Gas Operator | Apr 1990 | |
| 2 | Manorado Oil Company | Oil Operator | Feb 1999 | |
| 3 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 4 | Mid-South Trading, Inc. | Oil & Gas Operator | Jan 2024 | |
| 5 | Miles Oil & Gas Co. | Oil & Gas Operator | Feb 1988 | |
| 6 | Milton Galoob | Oil Operator | Dec 1988 | |
| 7 | Monroe Well Ser-La Petr Assoc | Oil Operator | Dec 1988 | |
| 8 | Monroe Well Serv-Omega 1985 | Oil Operator | Dec 1988 | |
| 9 | Monroe Well Service | Oil & Gas Operator | Apr 1998 | |
| 10 | Monroe Well Service-Columbus | Oil Operator | Dec 1988 | |
| 11 | Monroe Well Service-Lexington | Oil Operator | Feb 1989 | |
| 12 | Mooringsport Energy Prod Corp | Oil & Gas Operator | Oct 1994 | |
| 13 | Murphrey Oil Co | Oil Operator | Jan 2024 |