| Advanced Web Solutions | Ontario |
| Advanced Websites.ca | Ontario |
| AdvancedBytez | |
| AdvanCode.com | Ontario |
| Advanis | Alberta |
| Advansis Virtual | Ontario |
| Advantage Communications, Inc. | Prince Edward Island |
| Advantage Virtual Services Ltd | |
| Advantage2Retail, Inc. | Quebec |
| Advantech Wireless, Inc. | Quebec |
| Advantis Communications, Inc. | Ontario |
| Advatek Systems, Inc. | New Brunswick |
| Advent Instruments, Inc. | British Columbia |
| Adventure Bucket List | British Columbia |
| Adventus, Inc. | Nova Scotia |
| Advertix Web Design | |
| Advicent Solutions | Manitoba |
| Adviceon.com | Ontario |
| Advisia | Quebec |
| AdVision eCommerce | British Columbia |
| Adviso | Quebec |
| AdvisorNet Communications, Inc. | |
| Advoca | Ontario |
| AdvOSS | British Columbia |
| AdWave | Ontario |
| Adysta | |
| AdzeYbrant | |
| AE ComputArE, Inc. | Ontario |
| AEBC Internet Corporation | British Columbia |
| AEData | |
| AedoAI, Inc. | Quebec |
| AEM Antennas, Inc. | |
| AEMK Systems, Inc. | Ontario |
| Aeolus Digital, Inc. | |
| Aeon Blue | |
| Aeonic | |
| AEPONYX | Quebec |
| AEPONYX, Inc. | |
| Aequilibrium | British Columbia |
| Aereas Interactive | Ontario |
| AEREX avionique, Inc. | |
| Aerial Evolution Association of Canada | |
| Aerial Technologies | |
| Aerial Vehicle Safety Solutions, Inc. | |
| Aerium Analytics | Alberta |
| Aero Geometrics Ltd | British Columbia |
| Aéro Montréal | Quebec |
| Aero Tec Software Solutions, Inc. | Alberta |
| AeroEmploi | |
| Aeroflux Braking Systems | |