| Abbreviation | Definition |
|---|---|
| MWC | Medwell Capital Corp. |
| MWC | Medwell Capital Corporation |
| MX | Methanex Corporation |
| MXG | Maxim Power Corp. |
| MXG | Maxim Power Corporation |
| MXY | Magma Energy Corp. |
| MXY | Magma Energy Corporation |
| MYG | MethylGene Inc |
| MYG | MethylGene Incorporated (de-listed) |
| MYG | MethylGene Incorporated (de-listed) |
| NA | National Bank of Canada |
| NAE | NAL Oil & Gas Trust |
| NAF | North American Financials Capital Securities Trust |
| NAL | Newalta Corporation |
| NAS | Northstar Aerospace, Inc. |
| NAS | Northstar Aerospace, Incorporated |
| NAU | Northland Resources S.A. |
| NAU | Northland Resources S.A. (Société Anonyme) (de-listed) |
| NBD | Norbord Inc. |
| NBD | Norbord Incorporated (de-listed) |