Based in the Shard, London, Jellyfish offers advertising, paid search and data analytics services to clients such as the NHS. Run by chief executive Rob Pierre, 43, it has a fast-growing American division with offices in New York, Baltimore, San Francisco and Reston, Virginia, as well as a South African office. International sales hit £22.9m last year.

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Company details
Year2017
Rank42
CompanyJellyfish
ActivityDigital marketing agency
LocationCentral London
2-yr av intl sales growth pa75.34%
International sales £000s22,922
Total sales £000s53,054
Staff329
Founded1999
Websitewww.jellyfish.co.uk

If applicable:

* Supplied by company † Annualised figure