| Suite 203 Communications | |
| SuiteSpot, Inc. | |
| SUM Brand + Design | Ontario |
| Suma Distribution Informatique | Quebec |
| Sumagen Canada | |
| Sumire Design | British Columbia |
| Summer Digital | |
| Summit Nanotech | |
| Summit Tech | Quebec |
| Summum Media 360, Inc. | |
| Sumo Web | Quebec |
| Sun Country highway | |
| Sun Softwares Canada | Ontario |
| Sun Web Solutions | New Brunswick |
| Sun Web Solutions | |
| Sunbaked Software, Inc. | Alberta |
| Sunbowl | British Columbia |
| Suncayr | |
| Sunco Communication and Installation Ltd | |
| Suncrest College | |
| Sunday Roast | |
| Sunday Value | Ontario |
| Sundiata Warren Group, Inc. | |
| Sunergo | |
| Sunergon | Alberta |
| Sunitron, Inc. | Ontario |
| Sunly Energy | |
| Sunny Oasis Internet Corporation | Ontario |
| Sunnybrook Health Sciences Centre | |
| SunnysideTech | Alberta |
| SunProWeb | Ontario |
| Sunram Systems, Inc. | Ontario |
| Sunrise Computer Consulting | Ontario |
| SunTel Technologies, Inc. | Ontario |
| Sunwapta Solutions, Inc. | Alberta |
| Sunwire, Inc. | Ontario |
| Super Infotech | Quebec |
| Super-Micro | Quebec |
| Superb Systems, Inc. | British Columbia |
| SuperBeam | |
| SuperFax Communication, Inc. | British Columbia |
| Supergeek | British Columbia |
| Supergravity, Inc. | Ontario |
| Superink.ca | Ontario |
| Superion, Inc. | British Columbia |
| Superior Audio Video Unlimited | |
| Superior Tech | |
| Superior Web Systems | Ontario |
| Superiorcomputers | Ontario |
| Superlcoud | |