** Bitcoin miner and data center developer Cipher Mining's CIFR.O shares rise 2.6% to $11.96 premarket
** CIFR late Thursday announced pricing of upsized private offering of $1.1 billion of convertible bonds due 2031
** Stock slumped 17.5% on Thursday after CIFR unveiled convertible bonds offering
** Offering boosted from initial size of $800 million of convertible bonds
** Initial conversion price of $16.03 per share represents 37.5% premium to CIFR's last reported sale price
** 11 of 13 brokerages rate stock "buy" or higher and 2 "hold"; median PT $7.50 - data compiled by LSEG
** As of last close, CIFR stock up 151.3% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))