About Ad Age Agency Report 2021

Ad Age Datacenter produced the 77th annual Ad Age Agency Report. The complete Ad Age Agency Report 2021 was published online May 3, 2021, at AdAge.com/agencyreport2021. A summary of Ad Age Agency Report 2021 appears in the print edition.Information for Agency Report 2021 came from questionnaires submitted by agencies and from analysis and estimates by Ad Age Datacenter.The ranking of the world’s 25 biggest agency companies is based on revenue. Agency and network rankings generall