| ARC Medical, Inc. | British Columbia |
| ARC Systems | |
| Arcacia | Ontario |
| Arcane Digital, Inc. | Ontario |
| Arcane Technologies, Inc. | Quebec |
| Arch Biopartners | |
| Arch Visual Communications, Inc. | Alberta |
| Archangel | |
| Archangel Media, Inc. | Ontario |
| Arche Innovation | |
| Arche TI | Quebec |
| Archelon, Inc. | Ontario |
| Archetyp Technologies | |
| Archiact | British Columbia |
| Archidata, Inc. | Quebec |
| Archit Business Solutions, Inc. | |
| Architech Solutions | Ontario |
| Architexture | British Columbia |
| Archive Digital | British Columbia |
| Archon Systems, Inc. | Ontario |
| Arcitura Education, Inc. | British Columbia |
| Arcline (2000), Inc. | Ontario |
| ARCO Computers | Ontario |
| Arcos Technologies, Inc. | |
| ARCS Group Ltd | Ontario |
| ArcTern Ventures | Ontario |
| Arctic AI | |
| Arctic Data Corporation | British Columbia |
| Arctic Digital Ltd | Northwest Territories |
| Arctic Leaf | |
| Arctic Palm Technology, Inc. | Ontario |
| Arctiq | |
| Arcturus Networks, Inc. | Ontario |
| Arcturus, Inc. | Nova Scotia |
| Arctus | Quebec |
| Arcuve | Alberta |
| ARCX, Inc. | Ontario |
| ARDA Power, Inc. | Ontario |
| Ardco.ca | Ontario |
| Ardea Outcomes | Nova Scotia |
| Ardecom | Quebec |
| Ardent Development | New Brunswick |
| Ardes | |
| Ardexus, Inc. | Ontario |
| Ardoise Design, Inc. | |
| Ardra | |
| AReNA | |
| Arescon Ltd | British Columbia |
| Aretas Sensor Networks | |
| Arete Software, Inc. | Ontario |