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Incumbent WPP first won the business in 2021, and formed a bespoke unit called WPP Open X dedicated to the beverage brand client.
Former creative partner at the agency Polina Zabrodskaya alleges 'harassment and discrimination' after raising concerns about campaigns.
The deal could give WPP, which owns a 40% stake in the research company, a new source of cash after the ad giant suffered a $55 million profit drop in its latest earnings.
The group is urging shareholders to demand greater transparency on fossil fuel-related risks, before approving the merger.
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