After-Hours News: Shake Shack Inc (SHAK), Cisco Systems Inc (CSCO), J C Penney Company Inc (JCP)

After the closing bell Wednesday, Shake Shack Inc. shares jumped more than 8 percent after the fast-casual burger joint said its first-quarter revenue grew 56 percent. Meanwhile, department store J C Penney Company Inc. narrowed its losses from a year earlier by 52 percent. Network equipment maker Cisco Systems Inc. topped Wall Street forecasts as revenue rose 5 percent, helped by strong demand for switching equipment and routers. Here's a deeper look into companies reporting after the closing b...