- Selby General Hospital
- Select Medical Rehabilitation Services
- Select Specialty Hospital
- Select Specialty Hospital
- Select Specialty Hospital - Phoenix
- Select Specialty Hospital - Quad Cities
- Select Specialty Hospital Fort Smith
- Select Specialty Hospital Oklahoma City
- Select Specialty Hospital Tulsa
- Select Specialty Hospital, Erie
- Select Specialty Hospital, Greensburg
- Select Specialty Hospital, Pittsburgh
- SelecTrim Corporation
- Self Help for Hard of Hearing People, Inc.
- Self Help for the Elderly
- Self Regional Healthcare
- Selman Chevrolet
- Semarca Corporation
- Semiconductor Equipment and Materials International
- Seminole Electric Cooperative
- Seminole Rotary Club
- Seminole Work Opportunity Program
- Semmes Murphy Clinic
- Sempra Energy
- Senado del ELA
- Senator Orrin Hatch Office
- Senior Citizens Mutual Insurance Company
- Senior Community Svc. Empolyment
- Senior Living Systems, Inc. - Hackettstown, NJ
- Senior Navigator.com
- Senior Services of Alexandria
- Seniority, Inc.
- Seniors Unlimited
- Sentara Albemarle Medical Center
- Sentara Careplex Hospital
- Sentara Halifax Regional Hospital
- Sentara Leigh Memorial Hospital
- Sentara Martha Jefferson Hospital
- Sentara Norfolk General Hospital
- Sentara Northern Virginia Medical Center
- Sentara Obici Hospital
- Sentara Princess Anne Hospital
- Sentara Virginia Beach General Hospital
- Sentara Williamsburg Regional Medical Center
- Sention
- Sequoia Community Health Centers
- Sequoia Voting Systems
- Serenity Funeral Home
- Service Brands International
- Service Corporation International