| Abbreviation | Definition |
|---|---|
| MLX | Marsulex Inc. |
| MLX | Marsulex Incorporated (de-listed) |
| MLX | Marsulex Incorporated (de-listed) |
| MM | Mood Media Corporation |
| MMM | Minco Gold Corporation |
| MMN | Multi-Manager Limited Partnership I |
| MMP | Precious Metals and Mining Trust |
| MMW | Magma Metals Limited |
| MMZ | Metalline Mining Company |
| MN | March Networks Corporation |
| MNB | Mirabela Nickel Ltd. |
| MNB | Mirabela Nickel LTD. (de-listed) |
| MNB | Mirabela Nickel LTD. (de-listed) |
| MND | Mandalay Resources Corporation |
| MNF | Macquarie NexGen Global Infrastructure Corporation |
| MNR | Mediterranean Resources Ltd. |
| MNR | Mediterranean Resources LTD. (de-listed) |
| MNR | Mediterranean Resources LTD. (de-listed) |
| MOL | Moly Mines Limited |
| MOZ | Marathon Gold Corporation |