In the Sunday Times’ latest Fast Track 100 business index, privately-owned PTFS came 64th.
Many firms that have previously featured in the index have gone on to float on the stock market or become household names.
PTFS has seen annual growth of nearly 80% and it is the only company of its kind in the top 100.
The company had a recent financial boost when Lloyds Development Capital, part of Lloyds TSB Group, bought a 22% stake.
Mike Allison, managing director of PTFS, says: “We are operating in a competitive market so to see this growth is superb. Our network numbers are growing apace as brokers become aware of our proposition and we have a number of launches scheduled for 2007 which will further enhance our offering.”