A host of firms including Latham & Watkins and Wachtell Lipton Rosen & Katz have taken roles on the merger of advertising heavyweights Omnicom and Publicis Groupe, a deal which has created a $35bn (£23bn) company.

The deal, announced yesterday (28 July) is the largest public company merger of 2013 so far, and creates the world’s leading company in communications, advertising, marketing and digital services.