Omnicom to buy Brazil advertising group ABC, source says

By Tatiana Bautzer and Guillermo Parra-Bernal SAO PAULO (Reuters) - Omnicom Group Inc, the world's second largest advertising company, has agreed to pay 1 billion reais ($270 million) for Brazil's Grupo ABC, growing Omnicom's publicity, branding services and content in Latin America's largest economy, a source with direct knowledge of the transaction said on Friday. Grupo ABC's founding partners Nizan Guanaes and Guga Valente agreed to stay with the company for five years, the source said.