Check out the companies making headlines after the bell Tuesday:
GoPro - The wearable camera maker . It shipped 1.3 million cameras during the quarter, in line with expectations. Shares reversed an initial after-hours drop after the company issued better-than expected earnings guidance.
Twitter - The microblogging site beat Street forecasts, but revenue and monthly average user figures fell below expectations. Twitter's stock tumbled as much as 20 percent after the company's results leaked online early.
U.S. Steel - The company reported a surprise quarterly loss and missed revenue forecasts, sending the steel producer's shares down about 7 percent.
Panera Bread - The bakery chain missed estimates on the top and bottom lines as profit fell 25 percent from a year ago. The stock tumbled about 3 percent.