- Sequoia Hospice
- Serene Care Hospice
- Serenity Care
- Serenity Care Hospice
- Serenity First Hospice
- Serenity Health Management
- Serenity Healthcare Management
- SerenityEngage
- Service Employees International Union
- Service Power
- ServiceNow
- Services & Advocacy for Gay Lesbian Bisexual & Transgender Elders (SAGE)
- Seven Deuce Entertainment
- Seventh Heaven VR
- Sg2
- SHARE Foundation
- ShareCare
- Sharon S. Richardson Community Hospice
- Sharp Grossmont Hospital
- Sharp HealthCare