** Shares of bitcoin mining and data center infrastructure firm Cipher Mining CIFR.O jump 6.6% to $18.40 premarket
** Trading firm Jane Street disclosed a 5% stake in CIFR late on Thursday
** Jane Street is now CIFR's third-largest shareholder after V3 Holding and Vanguard Group
** 12 of 14 brokerages rate CIFR "buy" or higher and two "hold"; median PT $16.50 - data compiled by LSEG
** As of last close, CIFR shares have surged more than threefold YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))