| Arkys | Quebec |
| ARL Group of Companies Ltd | Ontario |
| ARMA Biosciences | |
| Armada Data Corporation | |
| Armagh Cash Register Ltd | Ontario |
| ArmCode | British Columbia |
| Armour Technology Solutions, Inc. | Ontario |
| ARMS, Inc. | Newfoundland and Labrador |
| Armstrong Partnership | Ontario |
| ARN Québec | |
| Arneeon Media | Saskatchewan |
| Arnica Software Corporation | Ontario |
| Aro Systems, Inc. | |
| Arolytics | Alberta |
| Aroma Web Design | British Columbia |
| Around KW Hosting | Ontario |
| Around The Clock Web Designers, Inc. | Ontario |
| Arrai Innovations, Inc. | Alberta |
| Array Design | Ontario |
| ARRAY Development | Ontario |
| Arrivage | |
| Arrow Geomatics, Inc. | Ontario |
| Arrowsmith Corporation | Ontario |
| Arsenal Web | Quebec |
| Art & Science | Ontario |
| Art Collision | |
| Art Design | Ontario |
| Art Gate VR | Ontario |
| Art Plus Code, Inc. | |
| Art Systèmes Canada, Inc. | Quebec |
| Art Total Multimédia | Quebec |
| Art-D | Ontario |
| Art-Step | Quebec |
| Art2Go | Ontario |
| Artaflex, Inc. | Ontario |
| Artbiz | Alberta |
| Artboard Studio | |
| Artease | Ontario |
| Arteca | Quebec |
| Artech Electronics Ltd | Quebec |
| Artefactual Systems, Inc. | British Columbia |
| Arter Kirkwood & Associates | Alberta |
| Arteria AI | |
| Artform | Ontario |
| Arthemedia Design Studio | Quebec |
| Arthritis Research Canada | |
| Arthur and associates, inc. | Ontario |
| Artifact5 | Quebec |
| Artifex Media Group, Inc. | Quebec |
| Artificial Intelligence In Medecine, Inc. | Ontario |