| Marimetrics Technologies, Inc. | |
| Marine Thinking | |
| MarineNav | |
| Mariner | New Brunswick |
| Mariner Patners, Inc. | |
| MarineView Media | |
| Marinvent Corporation | Quebec |
| Mario Blais | Quebec |
| Mario Drolet | Ontario |
| Marios Alexandrou | Ontario |
| Maritime 2-Way Radio Ltd | Nova Scotia |
| Maritime Christian College | |
| Maritime Launch Services | |
| Mark H. Goldberg & Associates, Inc. | Ontario |
| Mark Wilson Software Ltd | Ontario |
| Markanyx | |
| Market Metrics, Inc. | Ontario |
| Market2world Communications, Inc. | Ontario |
| MarketAccess | Ontario |
| MarketBox, Inc. | |
| Marketbridge Tech., Inc. | Ontario |
| Marketcircle, Inc. | Ontario |
| MarketEdge.Pro | |
| MarketHK | |
| Marketing Automation Canada | |
| Marketing Blendz | |
| Marketing Breakthroughs, Inc. | Ontario |
| Marketing for You | |
| Marketing Images | Ontario |
| Marketing Launch Innovations | Ontario |
| Marketing Media | |
| Marketing Montréal | Quebec |
| Marketing Organique | |
| Marketing What's New | Ontario |
| MarketingHits | Alberta |
| MarketinGROW | |
| MarketIQ | |
| MarketLinc | Saskatchewan |
| MarketplaceStudio.io | |
| MarketSpace Software | |
| Marketswell Solutions, Inc. | |
| Marloo Corporation | Ontario |
| Marmak Information Technologies | Ontario |
| Marmen, Inc. | |
| Marois Conception Visuelle Marketing, Inc. | Quebec |
| Maropost | Ontario |
| Marquee Communications | Newfoundland and Labrador |
| MaRS Discovery District | Ontario |
| MaRS Investment Accelerator Fund | Ontario |
| Mars VR Lab | |