- S.J.A. Pharm
- Samik
- Samjin
- Samnam
- Samsung Biologics
- Sandoz
- Sanofi
- Santen
- Satya
- SB Pharma
- SciClone
- SciGen
- Seng Thai
- Servier
- Shijiazhuang Yiling
- Shiono Chemical
- Silroc
- Sinil
- Sino-Asia
- Sinopharm Zhijun (Shenzhen)
- Sinovac
- Stada
- Star Medical Supplies
- Stellapharm
- Stiefel
- Stragen Pharma
- Strides Arcolab
- Sumitomo Pharma
- Sunny Plaza
- Sunward Pharma