Lobbyists having Amgen as a client
- acumen public affairs
- Burson-Marsteller
- cabinet DN consulting sprl
- FIPRA International Limited
- Fleishman-Hillard
- Hanover Communications International
- Hill & Knowlton International Belgium
- Ketchum
- Porter Novelli NV
- RPP Group
- SFL Regulatory Affairs & Scientific Communication GmbH
- The Health Policy Partnership