** Shares of drug developer Spero Therapeutics Inc SPRO.O
rise 96% to $1.6 - biggest pct gainer across U.S. stock
exchanges premarket
** Co says British drugmaker GSK Plc GSK.L to take a stake
in SPRO as part of licensing agreement for its experimental
antibiotic for complicated urinary tract infections urn:newsml:reuters.com:*:nL4N30T1H3
** Under agreement, GSK will make an upfront payment of $66
mln for the oral antibiotic and also buy $9 mln of SPRO's shares
** GSK to buy 7.45 mln of SPRO's share at a price of $1.21,
which is a premium of ~47% to its last close
** Up to Wednesday's close, stock lost ~95% YTD
(Reporting by Khushi Mandowara)
((Khushi.Mandowara@thomsonreuters.com;))