| As You Like It Marketing + Comunications | Ontario |
| ASAPP Financial Technology, Inc. | |
| Asatte Systems, Inc. | Ontario |
| Ascend HR Solutions, Inc. | |
| Ascendant Digital Solutions Group | |
| Ascent Systems Technologies | |
| AscenTech | |
| Ascentify Learning Media | Ontario |
| Ascentify Learning Media, Inc. | |
| Ascot IT Services | Alberta |
| ASDE | Quebec |
| Asepha | |
| ASETS | |
| ASETS-CA, Inc. | |
| ASH Technology Marketing | Ontario |
| Ashburton Ventures, Inc. | |
| Ashley Marketing Group | British Columbia |
| Ashlin Computer Corporation | Ontario |
| Ashoka Canada | Ontario |
| Ashored Innovations | |
| Ashton College | |
| Asia Communications Québec, Inc. | Ontario |
| Asia Pacific Foundation of Canada | |
| Asia Pacific Privacy Authorities | British Columbia |
| Asian Circuits, Inc. | Ontario |
| Asigra, Inc. | Ontario |
| Asima Health | |
| ASIMM | Quebec |
| Asix4 | |
| Ask Computers, Inc. | Ontario |
| Ask-AI | |
| Askuity | Ontario |
| ASL Consulting a division of ASL Enterprises, Inc. | Ontario |
| Aslan Computer Systems | Alberta |
| ASM Informatique, Inc. | Quebec |
| Asombro Marketing | |
| ASP Hosting | Ontario |
| Aspect Biosystems Ltd | |
| AssayNet | |
| Assaynet, Inc. | Ontario |
| Assek Technologies | |
| Assembly Technologies, Inc. | British Columbia |
| Assent Compliance, Inc. | Ontario |
| Assent, Inc. | |
| Asset Business Consulting | British Columbia |
| Assetsoft | |
| ASSIA AI | |
| Assister Technology Ltd | |
| AssKickin Solutions, Inc. | Ontario |
| Association de l'industrie électrique du Québec | Quebec |