| Altitude Accelerator | |
| Altitude Aerospace | |
| ALTITUDE Centre de L'Aviation, Inc. | Quebec |
| Altitude Communications | Alberta |
| Altitude Information Systems | British Columbia |
| Altitude Logic | |
| Altitude Stratégies | |
| Altius Renewable Royalties | |
| AltNexus, Inc. | Ontario |
| Altomaxx Professional Drone Services | |
| Altruistic Informatics Consulting, Inc. | Ontario |
| AltumView | |
| Altus Group Ltd | Ontario |
| AltX Media | |
| Alyson Software | Ontario |
| Alytx | |
| AM Canada, Inc. | Ontario |
| AM-PM Informatique | |
| AM/PM Mobile Solutions, Inc. | British Columbia |
| AM/PM Service Ltd | British Columbia |
| AM2D Software Systems Consulting Ltd | Ontario |
| AMA, Inc. | Ontario |
| Amabilis Software | British Columbia |
| AmacaThera | |
| Amador Business Computers, Inc. | Alberta |
| Aman Gulia | |
| Amanah | Ontario |
| Amanda Devries | Ontario |
| Amaron Consulting | Ontario |
| Amauta Marketing Internet | Quebec |
| Amazing Agency | Ontario |
| Amber Financial | British Columbia |
| AmberPOS | British Columbia |
| Ambidexter Management | British Columbia |
| Ambient Hues | |
| Ambient Photonics | |
| Ambix | Ontario |
| Ambrose University | Alberta |
| Amdocs | Ontario |
| AMEC Corporation | |
| Ameego | Manitoba |
| Amenaza Technologies Ltd | Alberta |
| Ameripex Systems | Ontario |
| AmeriSys, Inc. | Quebec |
| AMG Consulting | Quebec |
| Amgen, Inc. | |
| Amgine Technologies (US), Inc. | |
| AMGmedia Works, Inc. | British Columbia |
| Amical | |
| Amidship, Inc. | Ontario |