NYSE Euronext -- officially launched last spring -- is the company born out of the merger of the more than 200-year-old New York Stock Exchange and the pan-European stock exchange Euronext. It is home to some 4,700 listed companies representing a total market capitalization of nearly $27 trillion, and trading averages $157 billion each day.
The client's account is currently handled by Publicis Groupe's Fallon in the U.S. and by a number of agencies globally.
Executives familiar with the business estimate billings in the $25 million to $30 million range. The search process is being overseen by consultancy Ark Advisors, which did not immediately return calls for comment.
A Fallon spokeswoman referred calls to the client, which declined to comment.