TBWA Worlwide is an international advertising agency headquartered in New York City. The Agency is a unit of Omnicom Group, the world's largest advertising agency holding company. It was founded in 1970 in Paris, France, as a merger between Tragos American Management, Bonnange French Marketing, Wiesendanger Swiss Creation, and Ajroldi Italian Client Services. The first letter of each company name provided the initials for the new organization. They were purchased by the Omnicom Group in 1993.