Based in the Shard, central London, Jellyfish provides advertising, paid search and data analytics, including Google Analytics and DoubleClick, to clients such as Skype, Under Armour and Samsung. Run by chief executive Rob Pierre, 44, its fast-growing US division now has four offices, and it also has operations in South Africa. It opened in Barcelona last year to service fashion and fragrance business Puig, whose brands include Nina Ricci, Paco Rabanne and Jean Paul Gaultier. International sales were £38.3m in 2017.

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Company details
Year2018
Rank30
CompanyJellyfish
ActivityDigital marketing agency
LocationCentral London
2-yr av intl sales growth pa97.03%
International sales £000s38,323
Total sales £000s66,205
Staff331
Founded2005
Websitewww.jellyfish.co.uk

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* Supplied by company † Annualised figure