Euro RSCG has been appointed to the global advertising account for the NYSE Euronext, which includes the New York Stock Exchange.
It is understood to have beaten DDB London in a final pitch. Fallon Minneapolis was the incumbent on the business and it is not clear if it was involved in the pitch.
It had held the account for two years and won the account after NYSE bought rival exchange Archipelago in 2005. Fallon previously worked with the latter.
The review was overseen by NYSE marketing director Marissa Ricardo.
The NYSE is operated by NYSE Euronext, which was formed following a merger between NYSE and Euronext, a pan-European exchange, on April 4 last year.
NYSE Euronext is the first transatlantic stock exchange. It brings together six cash equities exchanges in five countries and six derivatives exchanges.
The NYSE is the largest stock exchange in the world by US dollar volume.