There’s an assault on “creative agencies” underway.

First, of course, is Martin Sorrell, who essentially told creative agencies they were worthless with the release of a prospectus last week for S4 Capital, his post-WPP agency play. Fresh off the $348 million acquisition of MediaMonks in July, the prospectus has plenty of interesting nuggets that provide some sense of how the ad titan perceives the industry. 

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