| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M & M Drilling And Development | Gas Operator | Dec 1988 | |
| 2 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Jan 2025 |
| 3 | McElroy Drilling Co., Inc. | Gas Operator | Dec 1987 | |
| 4 | Melren Oil & Gas Expl., Inc. | Gas Operator | Nov 1989 | |
| 5 | Mid Louisiana Gas Company | Oil & Gas Operator | Oct 2002 | |
| 6 | Mississippi River Transm. Corp | Oil & Gas Operator | Sep 2002 | |
| 7 | Mississippi Ventures | Gas Operator | Feb 1992 | |
| 8 | MLGW | Gas Operator | Sep 1984 | |
| 9 | Monroe Gas Associates-1 | Gas Operator | Mar 2000 | |
| 10 | Monroe Gas Associates-2 | Gas Operator | Mar 2000 | |
| 11 | Mor-Co Investments, Inc. | Gas Operator | Feb 1994 |