J
J. Walter Thompson
RebrandedNew York, New York, United States · Founded 1864
10000+ employees
Sourced & current · updated Jun 13, 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)
JWT was historically one of the top five largest global advertising agency networks, operating under WPP Group and competing directly with agencies like McCann, BBDO, and Ogilvy.
Ownership
Parent: WPP plc