| A&O Systems Group | Ontario |
| A&W Internet | Manitoba |
| A+ Computers & Services | |
| A+ Solar Solutions | |
| A+IT Solutions Ltd | |
| A-1 Electronics Ltd | Newfoundland and Labrador |
| A-1 Security Systems and Communications, Inc. | Ontario |
| A-Computers | Alberta |
| A-Power Computer Ltd | British Columbia |
| A-Prompt Project | Ontario |
| A-Sys Technologies | Quebec |
| A-Tech Electronics | Alberta |
| A-Z Computer Services | Ontario |
| A. J. Lill Consultants | Ontario |
| A.C.T. London | Ontario |
| A.D. Morrisn & Associates Ltd | Ontario |
| A.I. VALI, Inc. | |
| A.K.A. New Media, Inc. | Ontario |
| A.Net Solutions | Quebec |
| A.P. Computers, Inc. | Ontario |
| A.R. Gray & Associates | Quebec |
| A.R.C. Informatique | Quebec |
| A.S.A.P. Desktop Publishing | |
| A.S.N., Inc. | Quebec |
| A.U.G. Signals Ltd | Ontario |
| A.Y. Technologies, Inc. | |
| A1 Design, Inc. | Ontario |
| A1 Laptop | Nova Scotia |
| A100 | Alberta |
| A2aweb | |
| A2Z Design | Ontario |
| A2Z Dev Center | |
| A2ZPC | Ontario |
| A4 Systems | |
| A7 Intégration | |
| AA Electronics | Ontario |
| AAA Academy & Consulting Ltd | Saskatchewan |
| Aabstract Communications | Ontario |
| AACO Web & Graphic Design | Ontario |
| AAI Canada, Inc. | Ontario |
| AAKS Consulting, Inc. | |
| AALEN | Ontario |
| Aalpha Prime Tech Global | |
| Aalstec | Ontario |
| Aalto Technologies | Ontario |
| Aarav Solutions | |
| Aardcom Communications | Ontario |
| Aardcom Registration & Event Services | Ontario |
| Aarialife Technologies, Inc. | Ontario |
| Aaron Vegh | Ontario |