US allocated lion’s share of business.
China is most active market, representing 59% of region’s billings in March-April.
Five of 'big six' holding groups see billings drop.
Aliah Berman will lead global vision, strategy and execution of diversity, equity and inclusion initiatives.
Campaign looks at the top ad agencies ranked by gross new-business billing in 2022.
Meanwhile, AB InBev and Mondelez dominated media new business.
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