| Sendmarc | |
| Sendum Wireless Corporation | British Columbia |
| Seneca College | Ontario |
| Seneca’s Centre for Development of Open Technology | Ontario |
| Sennheiser (Canada), Inc. | Quebec |
| Seno Media | British Columbia |
| Senomix | Nova Scotia |
| Sensei Labs, Inc. | |
| Sensibill, Inc. | Ontario |
| Sensible Marketer | |
| Senso.ai | |
| Sensor Technology Ltd | Ontario |
| Sensors and Software, Inc. | Ontario |
| SensorSuite, Inc. | Ontario |
| Senstar Corporation | Ontario |
| SENSUS Communication Solutions, Inc. | British Columbia |
| Sentaca | Ontario |
| Sentec IT Services | |
| Sentex Communications Corporation | Ontario |
| Sentia Solutions | |
| Sentii | |
| Sentinel Hill Software, Inc. | British Columbia |
| Sentinel Institute for Cybersecurity | |
| Sentinel Systems Ltd | New Brunswick |
| Sentrix | |
| Sentry Security Systems, Inc. | Ontario |
| Sentryon IT Solutions | Ontario |
| Seo 7 Services | Quebec |
| SEO Administrator | British Columbia |
| SEO Brothers | |
| SEO Canada Services | Quebec |
| SEO Candyland | |
| SEO Expert Toronto | |
| SEO Expertise | Ontario |
| SEO Gurus | Ontario |
| SEO Guys Inc., The | Ontario |
| SEO in Canada | British Columbia |
| SEO in Vancouver | |
| SEO Injen, Inc. | |
| SEO Nerds | Ontario |
| SEO Propellant | |
| SEO Pros | Ontario |
| SEO Toronto | Ontario |
| SEO Toronto Experts | |
| SEO Toronto Specialists | |
| SEO Vancouver Company | British Columbia |
| SEO WEB FIRST | British Columbia |
| SEO Website Marketing | Alberta |
| SEO Writer | Ontario |
| SEOBank | Ontario |