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WPP Group's advertising agency holdings include Ogilvy & Mather Worldwide, Young & Rubicam, and J. Walter Thompson Company. Its public relations company holdings include Hill and Knowlton, Ogilvy Public Relations Worldwide, Burson-Marsteller, and Cohn & Wolfe.
WPP Group trades on the London Stock Exchange (symbol: WPP) and the Nasdaq (symbol: WPPGY).