Activist investor Icahn asks Apple to make a tender offer for shares

Activist investor Carl Icahn asked Apple to accelerate its share repurchases on the belief that the company is undervalued in a Thursday letter to the company. On Wednesday, Icahn announced on Twitter that he would be sending an open letter to Apple CEO Tim Cook. Icahn will be on CNBC's "Halftime Report" Thursday at 12 p.m. ET..