- A Diedenhofen
- A.Menarini
- Abbott
- AbbVie
- Able Medical
- Accord Healthcare
- ACCORD-UK
- Actavis
- Advance Pharma
- Aerocare
- AFC-HD AMS Life Science
- Aguettant
- Alcon
- Alfasigma S.p.A
- ALK
- Allergan
- Alliance Pharma
- Alvogen
- AMCo
- American Taiwan Biopharm
- Amgen
- Anesta LLC
- Anfarm-Hellas
- AOP Orphan
- Apexcela
- Apotex
- Apotex Inc
- Asence Inc.
- Asmeco
- Astellas Pharma
- AstraZeneca
- Atlanta Medicare
- Atlantic Lab
- Atlantic Pharma
- Atnahs
- AV Manufacturing
- AYA