In the past five years, Slough-based Chiltern has conducted almost 2,000 clinical trials in 47 countries for clients in the pharmaceutical and biotech sectors. Chief executive Jim Esinhart, 54, saw international turnover reach £331.3m last year, partly due to acquisitions, including that of US clinical research company Theorem in 2015.

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Company details
Year2017
Rank61
CompanyChiltern International Group
ActivityContract research provider
LocationSlough
2-yr av intl sales growth pa65.32%
International sales £000s*331,300
Total sales £000s*400,178
Staff4,500
Founded2006
Websitewww.chiltern.com

If applicable:

* Supplied by company † Annualised figure