- Omnicom Group
- DDB Worldwide
- FleishmanHillard
- Interpublic Group of Companies
- Publicis
- BBDO
- WPP plc
- Apple Inc.
- Rob Allyn
- Daftar perusahaan Amerika Serikat
- Omnicom Group
- Proposed merger of Publicis and Omnicom
- Ketchum Inc.
- OMD Worldwide
- Big Six advertising agencies
- The Interpublic Group of Companies
- TBWA Worldwide
- Ketchum
- Publicis
- BBDO
