- SCP Health
- Scripps Health
- Searchlight Capital Partners
- Searcy
- Seasons Hospice & Palliative Care
- Section 32
- Secura Home Health
- SEI Healthcare
- SEIU
- SEIU Healthcare
- SEIU Healthcare Illinois
- SEIU Healthcare Minnesota
- SEIU Illinois
- SEIU Local 503
- Select Data
- Select Home Care
- Select Rehab
- Select Senior Living
- Selfhelp Community Services Inc.
- Selman-Holman