The French-owned media and advertising network said it achieved organic growth of 6.2% for the quarter ending 30 September.
The network won £1.2bn in new business during the quarter, including media accounts such as L'Oréal, Richemont and Gillette.
Europe contributed £255.7m in revenue, organic growth of 2.3% compared with 2004. The largest market, North America, contributed £295.7m, up a healthy 7.7%. The strongest growth came from Asia Pacific and Latin America and the rest of the world.