Havas reported first quarter revenues grew 20.6%, or 7.1% on an organic basis, to $529M as the ad/PR conglomerate said two years of "strategic measures" are paying off.

North America was the "biggest growth driver" at 37.1% (10.2% organically) with revenue of $201M.

Havas chairman and CEO Yannick Bollore acknowledged that falling oil prices and a weaker euro boosted its bootom line, but he also credited a "strong internal dynamic."

PR wins for the quarter included Getty Images, Boostcase, Peparami and Mercedes-Benz Vans.