| Additional Software, Inc. | |
| Addmore Group | Ontario |
| Adecco Employment Services Ltd | Ontario |
| Adedia, Inc. | British Columbia |
| Adelweiss Technologies | |
| Adeo Marketing | Quebec |
| Adeptmind | |
| ADFLOW Networks | Ontario |
| ADG Informatique, Inc. | Quebec |
| ADGN Consultants | Quebec |
| AdGraphics | Ontario |
| AdHawk Microsystems | |
| Adhesive Communications | Ontario |
| adHub, Inc. | |
| Adin Group, Inc. | Ontario |
| ADInfo | Quebec |
| Aditude | Ontario |
| Adlan Corporation | Ontario |
| Adler Web Design | Quebec |
| Adlib | Ontario |
| AdLuge | |
| Admaco | Quebec |
| adMare Bionnovations | |
| Admark Communications & Design | Quebec |
| Admee Marketing | British Columbia |
| Adment Digital, Inc. | Ontario |
| Adminware Corporation | Manitoba |
| ADN Communication | Quebec |
| ADN emploi | |
| Adnet Communications, Inc. | British Columbia |
| Adnetis | Quebec |
| ADNM International | Quebec |
| Adobe Canada | Ontario |
| Adora Graphics | Ontario |
| ADP Canada Co. | Ontario |
| AdParlor | Ontario |
| AdPlus Media, Inc. | |
| Adputer, Inc. | Ontario |
| Adrénaline Solutions | Quebec |
| ADRM Technology Consulting Group Corporation | Ontario |
| Adroit Technologies | British Columbia |
| Adromedia Technologies | Quebec |
| Adsolutions Marketing, Inc. | British Columbia |
| Adster Creative | Alberta |
| Adstra Systems, Inc. | Ontario |
| Adtailor, Inc. | |
| ADTEL, Inc. | Alberta |
| Advameric | Ontario |
| Advanca | Ontario |
| Advance Business Systems | Ontario |