Managing director John Pettifor led the deal.
Campden specialises in producing publications in the healthcare and wealth management arenas. Most of the revenues come from advertising in such titles, half of which are in-house magazines for trade bodies such as the Royal College of GPs. The group also receives income from events related to the magazines.
Matrix put in £2.5 million into the deal and the two ProVen VCTs run by Beringea invested £1.5 million. HSBC provided the banking part of the transaction.