Isobar, Dentsu X, J. Walter Thompson, UM and OMD among the agencies shifting positions in R3's latest ranking.
Big changes on the media league table as Carat takes the lead.
Climbers include Leo Burnett, Saatchi & Saatchi, Vizeum and UM, as DDB, Carat and OMD lose ground.
As it's early in the year, big moves up and down characterise the creative and media tables.
Publicis Worldwide and Wavemaker are quickest off the blocks.
TOP OF THE CHARTS: 'Increasingly piecemeal' assignments sent creative revenue plunging by nearly 17%, but media firms saw a 5.4% revenue increase.
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