** Shares of cloud security firm Zscaler ZS.O fall 6.9% to $269.8 premarket
** Co on Tuesday raised its full-year revenue forecast to range of $3.28 billion to $3.30 billion from $3.27 billion to $3.28 billion
** Analysts say lack of guidance on cybersecurity co Red Canary raises questions about growth
** Co acquired Red Canary to speed up AI-driven security innovation
** At least three brokerages cut PT on ZS following results, according to LSEG data
** Co also beat Q1 estimates on revenue and profit, driven by strong demand for cloud and AI security solution
** 38 of 48 brokerages rate stock "buy" or higher, 10 "hold"; their median PT is $335 - data compiled by LSEG
** As of last close, stock up 60.59% YTD
(Reporting by Kanishka Ajmera in Bengaluru)
((Kaniska.Ajmera@thomsonreuters.com))