10 Biggest Advertising Agencies In The US

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8. PwC Digital Services, owned by PricewaterhouseCoopers

One of the two ad agencies in the list that is a unit of an established accounting firm, PwC Digital was recently called the world’s largest mobile marketing agency. Not bad for a sideline of an accounting giant. The $1.12 billion in revenues ($624 million from the US) that the unit takes in isn’t bad either. No wonder it’s on our list of biggest advertising agencies in the US.

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