Still, shares fell as much as 8% in premarket trading after Amazon's guidance for operating income at its AWS cloud computing unit came in at $15.5 billion to $20.5 billion for the third quarter. Wall ...

Amazon.com failed to live up to lofty expectations for its Amazon Web Services cloud computing unit after rivals handily beat Wall Street forecasts.

Amazon reported its second quarter earnings after the bell on Thursday that disappointed investors, sending its stock lower Friday morning.