Check out which companies are making headlines after the bell Thursday:
CBS - The network reported first-quarter earnings per share of 78 cents on $3.86 billion in revenue, versus estimated EPS of 74 cents on $3.91 billion in sales. Its shares declined in after-hours trading.
Gap - The clothing retailer jumped in after-hours trading after tallying a 9 percent rise in same-store sales in April. It also offered first-quarter EPS guidance above estimates.
GrubHub - The online food delivery site reported first-quarter earnings per share of 6 cents on $59 million in revenue, versus estimates of EPS of 3 cents on $53 million in sales. Its shares rose in after-hours trade.