You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract WPP Sues Spot Runner for Securities Fraud, Breach of Contract Accuses Agency of 'Pump and Dump' Stock Scheme By Rupal Parekh, Published on April 17, 2009 4 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.