When Baltimore Technologies sold its internet security division Content Technologies in 2002, Clearswift acquired it for £20.5m with backing from the venture capitalists Amadeus, Kennet and Cazenove. Headed by Jon Lee, Clearswift claims to be a world leader in secure messaging technology, with 15,000 customers, ranging from Nato to the life-assurance giant Standard Life. It says it has 20m end-users of its Mimesweeper software products, which vet incoming and outgoing company e-mails. Sales have increased by 216% a year from £2.3m in 2002 to £23.2m in 2004, when the company made a large loss.

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Company details
Year2005
Rank9
CompanyClearswift
ActivitySecurity software developer
LocationBerkshire
Average 3 year sales growth215.75%
Latest sales £000s23,238
Staff213
Founded1982
Websitewww.clearswift.com

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* supplied by company † annualised figure