MediaCom took second place again, with MEC in third followed by OMD. ZenithOptimedia regained the fifth place from Mindshare.
Carat, part of Dentsu Aegis Network, topped the list in the last report published in November last year. In June 2015, MediaCom held the top spot.
Recma looks at 650 agencies and evaluates their new business, business retention, awards, talent, and resources.
Two of Carat’s long-standing clients, British Gas and Kellogg, are currently reviewing the accounts.
Will Swayne, the global president at Carat, said: "Maintaining our leadership position reflects the momentum we have in the market, driven by our talented staff and ambition to redefine media to achieve better business outcomes for our clients."
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