The rise, up from 14.2 per cent on the same six-month period in 2006, is a result of a focus on improving staff costs and challenging over-servicing, according to Next Fifteen CEO Tim Dyson.
'Certain clients are abusers of the system and this leads to over-servicing, it's a huge problem for the industry,' said Dyson. 'It's good to have big name clients, but some need to be educated.'
Dyson said there was room for improvement in Next Fifteen's margins, and that would continue to be a focus.
The group is likely to acquire in the US and Asia over the next six months, but acquistions in the UK and Europe are less likely.
Revenues over the first last six months of 2007 rose 3.3 per cent to £30.4m.