Agency Report 2026—Legacy ad giants made moves, but newer rivals keep gaining share
World’s biggest agency companies
Ranked by 2025 worldwide revenue
Source: Ad Age Datacenter (Ad Age Agency Report 2026) • Numbers rounded. Asterisk indicates Ad Age Datacenter estimate. Revenue submitted by agencies and companies, obtained from financial filings or estimated by Ad Age Datacenter.
Omnicom made the biggest move in the ranking, rising to the top spot from No. 4 to dethrone Accenture Song, which slipped to No. 2. Omnicom has been here before—it was the No. 1 agency company from 1999-2008.
