Multinationals protect their computers from malicious attacks using software created by developer Sophos. In 2010, Apax Partners paid £383m for a 70% stake in the firm, founded in 1985 by Oxford graduates Peter Lammer and Jan Hruska. Last year it bought German firewall specialist Astaro Software. It is led by chief executive Steve Munford.

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Company details
Year2012
Rank169
CompanySophos
ActivitySecurity software developer
LocationOxfordshire
Sales £m228.9
Operating profit £m16.1
Main shareholders

Apax Partners (70%), management (30%)

Staff1,648
Founded1985
Websitewww.sophos.com

If applicable:

* supplied by company † annualised figure