| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M P O'Meara, Jr. Inc. | Oil & Gas Operator | Sep 2000 | |
| 2 | M. P. O'Meara Oil Co. | Oil & Gas Operator | Apr 1991 | |
| 3 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 4 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Oct 2025 |
| 5 | Maritech Resources, LLC | Oil & Gas Operator | May 2011 | |
| 6 | Martin Exploration Co. | Oil & Gas Operator | Apr 1986 | |
| 7 | McCormick-Bintliff | Oil & Gas Operator | Feb 1984 | |
| 8 | McMoran Exploration Company | Oil & Gas Operator | May 1985 | |
| 9 | McMoran Production Co. | Oil & Gas Operator | May 1985 | |
| 10 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 11 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 12 | Mobley Oil Company, Inc. | Oil & Gas Operator | Feb 1990 | |
| 13 | Mullen Exploration Inc | Oil & Gas Operator | Dec 2002 |