The COMvergence study reports Carat and Dentsu Aegis Network nipping at OMD's heels.
Agency will have billed estimated $19.6 billion by close of year.
TOP OF THE CHARTS: Overall Hong Kong media billings grew 6% over 2017, according to a newly released report.
TOP OF THE CHARTS: 17 international media agencies represent 37.8% of total market share in China, according to Comvergence.
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