| Artiiseo | |
| Artik Design | |
| Artinbox Studios | Quebec |
| Artisan2k | Quebec |
| Artiste QB Net, Inc. | |
| Artlogic | Quebec |
| ARTMS, Inc. | |
| Arts Avenue International, Inc. | |
| Arts Management Systems Ltd | Alberta |
| Artscript Canada Web Design | Alberta |
| Artshop.ca | Ontario |
| ArtSites.ca | British Columbia |
| ArtSoft.ca | Ontario |
| Artsversus Mutlimédia | Quebec |
| Arttina | Ontario |
| Arturo | Ontario |
| Artyfacts Canada | Alberta |
| Arvana Design Studios | Ontario |
| Arvik Innovation | |
| Arvox, Inc. | Quebec |
| ARXIQ | Alberta |
| Arxtech Canada | Quebec |
| Arxus | Saskatchewan |
| Arylla, Inc. | |
| Arzosoft, Inc. | Ontario |
| As You Like It Marketing + Comunications | Ontario |
| ASAPP Financial Technology, Inc. | |
| Asatte Systems, Inc. | Ontario |
| ASB Design | Alberta |
| Ascent Systems Technologies | |
| Ascentify Learning Media | Ontario |
| Ascot IT Services | Alberta |
| ASDE | Quebec |
| ASETS | |
| ASH Technology Marketing | Ontario |
| Ashburton Ventures, Inc. | |
| Ashley Marketing Group | British Columbia |
| Ashlin Computer Corporation | Ontario |
| Ashoka Canada | Ontario |
| Ashored Innovations | |
| 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 |
| ASIMM | Quebec |
| Ask Computers, Inc. | Ontario |
| Ask-AI | |