No price was disclosed, but Gresham principally invests in deals valued at up to £100m. Its most recent deal, the management buyout of food retailer West Cornwall Pasty Co, was for about £30m to £40m.
Established in 2000, 7city Group delivers courses to more than 20,000 delegates each year, both in the classroom and through distance learning solutions.
The group has more than 110 employees based at training centres in London and New York, with a third centre due to be launched in Singapore in 2008.
Gresham’s other investments in the business support sector include Swift, SThree and Tribal Group.