The first post-billion, big tech IPO of the year has opened with a bang. Zscaler, a security startup that confidentially filed for an IPO last year, closed out its first day of trading at $33/share, up 106% from its opening price of $16.

The enterprise cloud services company started trading this morning as ZS on Nasdaq at a price of $27.50/share,  a pop of 71.9  percent on its opening price, and its stock today reached a peak of $33.37.

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