- A Diedenhofen
- A.Menarini
- Abbott
- AbbVie
- ABCA Pharma Lab
- Able Medical
- Accord Healthcare
- Actavis
- Adimmune Corp
- Advance Pharma
- Aerocare
- Aguettant
- Aizant Drug Research Solutions
- Alfasigma S.p.A
- ALK
- Allergan
- Alliance Pharma
- Alvogen
- American Taiwan Biopharm
- Amgen
- Anesta LLC
- Antila LifeSciences
- AOP Orphan
- Apexcela
- Apotex
- Astellas Pharma
- AstraZeneca
- Atlanta Medicare
- Atlantic Lab
- Atlantic Pharma
- Aupa Biopharm
- AV Manufacturing
- AYA