Politics and Business magazines
- Simplex Technologies Inc.
- Simplicity Manufacturing, Inc.
- Simpson Investment Company
- Simpson Thacher & Bartlett
- Simula, Inc.
- SINA Corporation
- Sinclair Broadcast Group, Inc.
- Singapore Airlines Limited
- Singer & Friedlander Group plc
- Sir Speedy, Inc.
- Sirius Satellite Radio, Inc.
- Sirti S.p.A.
- Siskin Steel & Supply Company
- Sistema JSFC
- Six Flags Theme Parks, Inc.
- Six Flags, Inc.
- Sixt AG
- SJW Corporation
- SK Group
- Skadden, Arps, Slate, Meagher & Flom