David Einhorn, president of Greenlight Capital, holds a toy wand as he speaks at the Sohn Investment Conference in New York in this file photo taken May
David Einhorn, president of Greenlight Capital, holds a toy wand as he speaks at the Sohn Investment Conference in New York in this file photo taken May 16, 2012. Einhorn's Greenlight Capital has filed suit against Apple Inc in federal court in New York, saying the company needs to do more to unlock value for shareholders. REUTERS/Eduardo Munoz/Files (EDUARDO MUNOZ)