J
J. Walter Thompson
RebrandedNew York, New York, United States · Founded 1864
10001+ employees
Sourced & current · updated Sep 14, 2026
J. Walter Thompson (JWT) was one of the world's oldest and largest advertising agencies, renowned for iconic brand campaigns across the globe before merging with Wunderman in 2018 to form Wunderman Thompson.
Where they sit
Stack tier: Core Platforms (S)
Marketing Agency
Historically one of the world's largest and oldest full-service advertising agencies, operating as part of WPP before being merged into Wunderman Thompson and ultimately VML
Ownership
Parent: WPP plc