File photograph of William Ackman speaking to Canadian Pacific Railway

Activist shareholder William Ackman of Pershing Square Capital Management speaks during the Canadian Pacific Railway Ltd. shareholders and analysts meeting in Toronto in this February 6, 2012 file photograph. For now, William Ackman is getting the better of Carl Icahn in a well-publicized grudge match between the billionaire investors over Herbalife Ltd. REUTERS/Mike Cassese/Files (CANADA – Tags: TRANSPORT BUSINESS)

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