| Acusel Computers | British Columbia |
| Acute360, Inc. | Quebec |
| AcuteNet, Inc. | |
| Acutus Medical, Inc. | |
| Ad Auris, Inc. | |
| AD Metro, Inc. | Ontario |
| AD Micro Technology, Inc. | |
| Ad Valorem | |
| Ad Valorem, Inc. | |
| AD3R Technologies | Quebec |
| Ad4Game | Quebec |
| Ada | Ontario |
| Adam Bard | British Columbia |
| Adam Patterson | Alberta |
| Adam Rumanek | Ontario |
| Adam Senour | Ontario |
| Adam Sofineti | Quebec |
| Adam Young | Ontario |
| Adam8 | British Columbia |
| AdapCom | Quebec |
| Adapsyn Bioscience, Inc. | Ontario |
| Adapta Software, Inc. | British Columbia |
| Adaptative Marketing | British Columbia |
| Adaptek Systems, Inc. | Ontario |
| Adaptiiv | |
| Adapting Marketing | British Columbia |
| Adaptiv Networks, Inc. | Quebec |
| Adaptive Business Consulting Corporation | |
| Adaptive Finance Technologies | |
| Adaptive Media | Saskatchewan |
| Adaptive Media | |
| Adaptive Office Solutions | New Brunswick |
| Adaptive Technical | British Columbia |
| Adaptive Technical, Inc. | |
| Adaptom, Inc. | Ontario |
| Adara Technologies | Ontario |
| Adaria Vending Services Ltd | |
| Adastra | |
| Adastra Corporation | Ontario |
| Adastra Corporation | |
| Adax.ca | Ontario |
| AdChat Media Technology, Inc. | |
| Adcom Solutions | Saskatchewan |
| ADCstat | |
| Addaptron Software | British Columbia |
| Addata, Inc. | |
| Addax Computer | British Columbia |
| Addere | |
| Addison Électronique | Quebec |
| AdDispenser | Ontario |