| Advoca | Ontario |
| AdvOSS | British Columbia |
| AdWave | Ontario |
| Adysta | |
| AE ComputArE, Inc. | Ontario |
| AEBC Internet Corporation | British Columbia |
| AedoAI, Inc. | Quebec |
| AEM Antennas, Inc. | |
| AEMK Systems, Inc. | Ontario |
| Aeon Blue | |
| AEPONYX | Quebec |
| AEPONYX, Inc. | |
| Aequilibrium | British Columbia |
| Aereas Interactive | Ontario |
| AEREX avionique, Inc. | |
| Aerial Technologies | |
| Aerial Vehicle Safety Solutions, Inc. | |
| Aerium Analytics | Alberta |
| Aero Geometrics Ltd | British Columbia |
| Aéro Montréal | Quebec |
| Aéro Montréal | |
| Aero Tec Software Solutions, Inc. | Alberta |
| AeroEmploi | |
| Aeroflux Braking Systems | |
| Aeronav, Inc. | Quebec |
| Aeroneuf Instruments Ltd | |
| Aeronovo | |
| Aéroport AI | |
| Aéroport de Sherbrooke | Quebec |
| Aéroports de Montréal | |
| AeroQube | |
| Aerosoft Systems, Inc. | Ontario |
| Aerospace Industries Association of Canada | |
| Aerospace Manufacturing and MRO Conference | |
| Aerosphere | |
| Aerosystems International, Inc. | Quebec |
| Aerotec Engines Ltd | |
| Aesonlabs Data Recovery Systems | |
| Aethon Design & Development | Quebec |
| Affective Design, Inc. | Alberta |
| Affine Communications | British Columbia |
| Affinio, Inc. | Nova Scotia |
| Affinity Biologicals, Inc. | Ontario |
| Affinity Bridge | British Columbia |
| Affinity Credit Union | |
| AffinityImmuno, Inc. | Prince Edward Island |
| Affluences.ca | Quebec |
| Affordable Computer Tech | British Columbia |
| Affordable Web Design | British Columbia |
| Affordable Web Design Ltd | |