- S Kant Healthcare
- S V More
- S.c Rompharm
- S.M.H.P.
- Saga Lab
- Saga Lifesciences
- Sai Mirra Innopharm
- Sakar Healthcare
- Salutas
- Samchundang Pharm
- Samjin
- Samson Laboratories
- San Marino
- Sance Lab
- Sandoval
- Sandoz
- Sanico NV/Pfizer Italia
- Sanjivani
- Sannovex
- Sanofi Pasteur
- Sanofi S.p.A.
- Sanofi Vietnam
- Sanofi Winthrop
- sanofi-aventis
- Sante
- Santen
- Sanzyme
- Sapphire Lifesciences
- Sava Healthcare
- Scheeling
- Schwabe Pharma
- Scitech Specialties
- Scott-Edil Advance Research & Laboratories & Education
- Scott-Edil Pharmacia
- Scriptmed
- Sea King Pharma
- Searle
- SENSOMED
- Serum Institute of India
- Servier
- Shandong Confucius Pharmaceutical
- Shandong Kexing
- Shandong Qidu
- Shandong Xier Kangtai
- Shanghai Henrui
- Shanxi Nuocheng Pharma
- Shenyang Sunshine
- Shenzhen Haibin
- ShenZhen Techdow
- Shin Poong
- Shine Pharma
- Shou Chan
- Siam Bheasach
- Sichuan Huiyu
- Siegfried Hameln
- Simcere Pharma
- Simpex Pharma
- SimplyNature
- Sincrofarm
- Singapore Genebio
- Singapore Pharmawealth Lifesciences
- Siu Guan Chem
- SK Plasma
- Skingen Biotech
- SM Pharma
- Softesule
- Sole Pharma
- Sonchel
- Sparsh Bio-Tech
- Specialty Innovation
- Square Pharmaceuticals
- SRS Life Sciences
- SRS Pharma
- Stada
- Stafford-Miller
- Stallion Labs
- Standard Chem
- Stangen Pharmaceuticals
- Starpharm
- Stellapharm
- Stiefel
- Suhitas
- Sumitomo Pharma
- Sun Pharma
- Sun Pharma Industries
- Sunrise International Labs
- Surepharm
- Surge Lab
- Swati Spentose
- Swiss Parenterals
- Swiss Pharma
- Swiss Pharmaceutical
- Sydenham
- Sydler Remedies
- Synmedic
- Synnovate