Martin Sorrell Promises New Venture Won’t Rival WPP, Sparking Uncertainty

Industry remains unsure what to expect from S4

Sorrell abruptly left WPP in April. Getty Images

Yes, Martin Sorrell looks like he’s returning to the ad industry.

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@kitten_mouse Lindsay Rittenhouse is a staff writer at Adweek, where she specializes in covering the world of agencies and their clients.