Publicis CEO Maurice Levy & Omnicom CEO John Wren

Publicis CEO Maurice Levy & Omnicom CEO John Wren

Balint Porneczi/Bloomberg

Publicis Groupe SA Chief Executive Officer Maurice Levy, left, and Omnicom Group Inc. Chief Executive Officer John Wren speak on the merger of the two companies during a news conference at the Publicis headquarters in Paris, on July 28, 2013.