Omnicom group is one of the four largest advertising groups in the world (the other three are WPP group, Publicis group and epex group) and a company listed on the New York Stock Exchange (NYSE: OMC). Founded in 1986, Omnicom group is headquartered in New York, the United States. Its business includes brand promotion, marketing, public relations and market research. It owns Hengmei advertising (DBB), Haoteng media and other companies announced the merger with Publicis group in 2013, and then announced the cancellation of the merger in 2014.
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