10 Biggest Advertising Agencies In The US

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4. Epsilon, owned by Alliance Data Systems Corporation (NYSE:ADS)

Alliance Data Systems is the company responsible for a lot of private label credit cards, coalition loyalty programs, and direct marketing services. An ad agency specializing in email marketing would be a natural extension of its operations. And that’s what Epsilon, next in line on our list of biggest advertising agencies in the US does. And the unit does it so well that it earns $2.14 billion, including $2.05 billion in the US.

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