TransUnion (formerly Callcredit), Leeds
Founded in 2000, Callcredit specialises in credit referencing, fraud and analytics services for businesses.
The Leeds-based company is the second-largest and fastest-growing consumer credit bureau in the UK.
It rebranded to TransUnion this year after a £1 billion takeover by the US giant.
Check out our '101 Yorkshire and Humberside’ list for more tech stars from the region.