Paris-based consultancy COMvergence has released its annual ranking of top global and U.S. media agencies by projected 2018 buying billings and market share. Omnicom Media Group's OMD tops both lists. Globally, COMvergence estimated that OMD collected $18.3 billion in billings for 2018 and has a market share of 6.3 percent. In the U.S., the network...
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