** Mizuho upgrades cybersecurity firm Rubrik RBRK.N to "outperform" from "neutral", reiterates PT at $97

** Shares of RBRK rise about 3.1% to $73.80 in premarket trading

** Mizuho sees the stock as undervalued relative to its growth prospects and competitive strengths

** Brokerage expects strong revenue growth, continued execution, and optional upside from AI-related features

** "We continue to believe RBRK's intense focus on protecting and operationalizing data, along with best-in-class ransomware defenses, have enabled it to significantly separate from most legacy and next-gen vendors in this space," says Mizuho

** 20 of 21 brokerages rate the stock "buy" or higher, one "hold", their median PT is $115 - data compiled by LSEG

** As of last close, RBRK stock has risen ~9.5% YTD

(Reporting by Anuj T in Bengaluru)

((anuj.t@thomsonreuters.com))