| Alphasearch | Nova Scotia |
| AlphaTech Business and Technology, Inc. | Prince Edward Island |
| Alphatek | |
| Alphavima Technologies, Inc. | |
| Alphawave Semi | |
| AlphaZero | Quebec |
| Alphinat, Inc. | Quebec |
| Alpine Aerotech | British Columbia |
| Alpine Domains, Inc. | British Columbia |
| Alpine Technical Services & Sales | British Columbia |
| Alrux | Ontario |
| ALT | Ontario |
| ALT Consulting Ltd | Ontario |
| Alt Richmond, Inc. | Ontario |
| alt Telecom | Newfoundland and Labrador |
| Alt Venture Capital Corporation | |
| ALT-C.com | Quebec |
| Alt-Tech, Inc. | Alberta |
| ALTA Consulting | |
| ALTA Electronics, Inc. | Ontario |
| AltaCom | |
| Altair Electronics | Ontario |
| AltaLink | |
| AltaML | |
| Altasciences | |
| Altaso Ltd | Alberta |
| AltaStream Control Systems | British Columbia |
| altavia.cloudraker | Quebec |
| Altavision Geographics | Saskatchewan |
| Altea Communications | Quebec |
| Altecon Data Communications, Inc. | Ontario |
| Alten Canada | Quebec |
| Alteo, Inc. | Quebec |
| AlterAction | Quebec |
| alterBiota | |
| Alteria Agency | |
| Alterna Savings | |
| AlternaTel, Inc. | Ontario |
| AlternativeBroadband.com | Ontario |
| Alternet Internet | British Columbia |
| Alterum | |
| Altevo | |
| Altheda Wellness Innovation | |
| Althera | |
| Altilogix | Quebec |
| AltimaTelecom | Quebec |
| Altimum IMS | Quebec |
| Altimus Design | |
| Altinformatique | Quebec |
| Altis MSP | Alberta |