| MMS | Macarthur Minerals Limited | TSX Venture | Active |
| MDA | MacDonald Dettwiler | TSX | Active |
| BMK | MacDonald Mines Exploration Ltd. cl A | TSX Venture | Active |
| MKZ.UN | MacKenzie Master Un | TSX | Active |
| MNF | Macquarie NexGen A | TSX | Active |
| MPT.UN | Macquarie Power Un | TSX | Active |
| MPT.DB.A | Macquarie Pwr 6.5 Db | TSX | Active |
| MCR | Macro Enterprises Inc | TSX Venture | Active |
| YEL | Macusani Yellowcake Inc. | TSX Venture | Active |
| MVN | Madalena Ventures Inc | TSX Venture | Active |
| MCZ | Mad Catz Interactv J | TSX | Active |
| MDE.P | Madeira Minerals Ltd | TSX Venture | Delisted |
| MDE.H | Madeira Minerals Ltd. | TSX Venture | Suspended |
| MMR | Madison Minerals Inc. | TSX Venture | Active |
| MPC | Madison Pacific Cl B | TSX | Active |
| MPC.C | Madison Pacific NV | TSX | Active |
| MAP | Maestro Ventures Ltd. | TSX Venture | Active |
| MAL | Magellan Aerospace | TSX | Active |
| MNM | Magellan Minerals Ltd | TSX Venture | Active |
| MAA | MagIndustries Corp J | TSX | Active |
| MXY | Magma Energy Corp. J | TSX | Active |
| MMW | Magma Metals Ord J | TSX | Active |
| MG.A | Magna Int'l Cl A SV | TSX | Delisted |
| MG | Magna Int'l Inc. | TSX | Active |
| MGN | Magnotta Winery | TSX | Active |
| MEN | Magnum Energy Inc. | TSX Venture | Active |
| MAG | MAG Silver Corp. J | TSX | Active |
| CBM.H | Mahalo Energy Ltd. | TSX Venture | Suspended |
| MJO | Mainstream Minerals Corporation | TSX Venture | Active |
| MEQ | Mainstreet Equity J | TSX | Active |
| MJX | Majescor Resources Inc | TSX Venture | Active |
| MJS | Majestic Gold Corp. | TSX Venture | Active |
| MDI | Major Drilling Group | TSX | Active |
| MLG | Malaga Inc. J | TSX | Active |
| MLA | Mala Noche Resources Corp. | TSX Venture | Delisted |
| MLA.R | Mala Noche Resources Corp sub receipts | TSX Venture | Delisted |
| MBG | Malbex Resources Inc | TSX Venture | Active |
| MND | Mandalay Res Corp J | TSX | Active |
| MND | Mandalay Resources Corporation | TSX Venture | Delisted |
| MND.WT | Mandalay Res Wt J | TSX | Active |
| MAM | Manicouagan Minerals Inc. | TSX Venture | Active |
| MNX | Manitex Capital Inc. | TSX Venture | Active |
| MBT | Manitoba Telecom | TSX | Active |
| MEI | Manitok Energy Inc | TSX Venture | Active |
| MTU | Manitou Gold Inc | TSX Venture | Active |