
Cloud security firm Zscaler's ZS.O shares rise 1.7% to $234.25 premarket
Mizuho upgrades rating to "outperform" from "neutral"
Brokerage confident that ZS is well-positioned in Secure Access Service Edge and Zero Trust markets
Average rating of 48 analysts is "buy"; median PT is $330.45 - data compiled by LSEG
As of last close, stock up 27.7% this year