| Abbreviation | Definition |
|---|---|
| MPC | Madison Pacific Properties Inc. |
| MPC | Madison Pacific Properties Incorporated Class B |
| MPM | Markland AGF Precious Metals Corp. |
| MPM | Markland AGF Precious Metals Corporation |
| MPT | Macquarie Power & Infrastructure Income Fund |
| MPV | Mountain Province Diamonds Inc. |
| MPVD | Mountain Province Diamonds Incorporated |
| MRC | Morguard Corporation |
| MRD | Melcor Developments Ltd. |
| MRD | Melcor Developments, LTD. |
| MRE | Martinrea International Inc. |
| MRE | Martinrea International Incorporated |
| MRI | Mercer International Inc. |
| MRL | Mantra Resources Limited |
| MRN | Marengo Mining Limited |
| MRS | Medoro Resources, LTD. |
| MRT | Morguard Real Estate Investment Trust |
| MRU | Metro Inc. |
| MRU | Metro Incorporated |
| MSD | MOSAID Technologies Incorporated |