Chief executive Dafydd Stuttard, 45, started developing his security testing software while working as a professional hacker for web security firms. In 2008 he began working full-time on his business, which he named after his old hacker handle, PortSwigger. Organisations in 120 countries, from small businesses to giants Microsoft and Google, use the Cheshire firm’s Burp Suite range of testing tools. Exports account for 90% of sales and hit £7.4m last year. It is one of the league table’s most profitable firms.

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Company details
CompanyPortSwigger Web Security
ActivityCyber-security software developer
2 yr av intl sales growth % pa50.62%
International sales £000s*7,380
Total sales £000s*8,133

If applicable:

* Supplied by company † Annualised figure