William Ackman, founder and CEO of hedge fund Pershing Square Capital Management, speaks during the Sohn Investment Conference in New York May 4, 2015. REUTERS/Brendan McDermid/File Photo
William Ackman, founder and CEO of hedge fund Pershing Square Capital Management, speaks during the Sohn Investment Conference in New York May 4, 2015. REUTERS/Brendan McDermid/File Photo