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
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