Amazon shares fell 4% in Frankfurt on Friday a day after the retailer's results showed weakness in its cloud computing unit and it forecast and lower-than-expected first-quarter

Amazon shares slid after the online-retail and cloud-services giant offered a first-quarter outlook that came up short of Wall Street’s expectations while forecasting bumpy trends in its cloud business.

The results echoed the slowdown at Microsoft and Alphabet-owned Google, and highlighted how U.S. cloud-computing giants were struggling to scale AI as infrastructure bottlenecks cap growth, forcing them to invest billions in data centers with little short-term payoff.