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Sir Martin Sorrell closed out the IAB Annual Leadership Meeting in Phoenix, Ariz., today with a sprawling conversation that touched on his feelings about retirement, the broken agency model, what Brexit could mean for GDPR and a prediction for Amazon’s growth potential. At the heart of the discussion, though, were his plans for his nascent company S4 Capital, which has been gaining momentum in recent months—first acquiring the digital content agency Media Monks for $350 million in July and then programmatic media buying company MightyHive
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