Amazon down after cloud revenue growth lags in first quarter

** Shares of e-commerce giant Amazon.com AMZN.O fall 4.3% to $182 in extended trading

** AWS revenue grows 17% in Q1, compared with estimates of a 17.4% increase

** Reports Q1 revenue of $155.7 billion, vs est. of $155.04 billion, according to data compiled by LSEG

** Company forecasts Q2 revenue between $159 billion and $164 billion, compared to Wall Street estimates of $160.91 billion

** Through close, stock had fallen 13.3% YTD