Founded in 2009 by chief technology officer Nathan Dornbrook, 43, this IT security provider was acquired in 2012 by the directors of Tech Track 100 alumnus ECS Group, but is run as a separate business under managing director David Calder, 40. The firm provides IT security expertise and services to large companies including banks and retailers, and has benefited from growing awareness of cyber-crime to enjoy sales of £12.2m last year. Based in Glasgow, it also has offices in Edinburgh, Leeds, Manchester and London.