** Shares of cybersecurity firm Rubrik RBRK.N, backed by Microsoft MSFT.O, rise nearly 6% to $56.94
** Rosenblatt upgrades RBRK's rating to "buy" from "neutral"
** "We believe Rubrik has a leading next-generation data backup and data recovery platform that should enable it to be a market leader for years to come," Rosenblatt analysts says in a note
** RBRK set to report Q4 2025 earnings on Thursday
** Eighteen of 21 brokerages rate stock "buy" or higher, 3 "hold"; median PT at $76 - data compiled by LSEG
** Including session's moves, stock down 13% YTD
(Reporting by Ateev Bhandari in Bengaluru)
((Ateev.Bhandari@thomsonreuters.com;))