Dentsu Inc.

Historically one of the world's top three advertising agency groups, dominant in Japan and a major global player prior to restructuring into Dentsu Group Inc.

Dentsu Inc. was founded in 1901 in Tokyo, Japan, and grew to become one of the largest advertising agencies in the world, dominating the Japanese market while expanding aggressively into global markets. For over a century, it operated as the primary operating entity behind a vast network of creative, media, and data-driven marketing services, serving major domestic and international brands across virtually every industry sector. Its scale in Japan was unparalleled, historically commanding a dominant share of the country's advertising market. On January 1, 2020, Dentsu Inc. completed a corporate restructuring and transitioned into a pure holding company structure, rebranding and reorganizing as Dentsu Group Inc. (TSE: 4324). Under this new structure, the former operating functions of Dentsu Inc. were absorbed into subsidiary operating companies, including Dentsu Japan Network and Dentsu International, which handle domestic and international operations respectively. The rebranding reflected a strategic shift toward a more globally integrated and operationally flexible organization. The legacy of Dentsu Inc. is foundational to the modern Dentsu Group, which today employs over 60,000 people across more than 145 countries and competes directly with WPP, Publicis Groupe, Interpublic Group, and Omnicom. Its historical strengths in integrated marketing, media buying, creative services, and data analytics continue to define the group's capabilities and competitive positioning in the global AdTech and marketing services ecosystem.