Carl Icahn speaking at Delivering Alpha in New York on Sept. 13, 2016.

Check out the companies making headlines after the bell:

Five Below shares soared more than 17 percent in extended trading. The discount retailer reported first quarter earnings and revenue that surpassed Wall Street expectations, and forecast strong second quarter and full year guidance. Five Below reported earnings of 35 cents on revenue of $296 million versus EPS of 32 cents on $291 million in revenue that analysts were expecting.