Valued at $15 billion by market cap, New York-based Omnicom Group Inc. (OMC) operates as one of the largest advertising, ...

The company will keep the Omnicom name and trade under the “OMC” ticker symbol on the New York Stock Exchange. The size of and reach of the new marketing giant will have multiple advantages ...

Omnicom is buying Interpublic Group in a stock-for-stock deal that will create the largest ad agency in the world with combined annual revenue of almost $26 billion. The names may be unfamiliar to ...