Updates
** U.S.-listed shares of lung therapy firm Verona Pharma VRNA.O I9SAy.F jump 20.3% to $104.47 premarket
** Merck MRK.N will buy London-based Verona Pharma for about $10 billion
** Merck will pay $107 per American depository share for Verona
** The purchase price is a premium of about 23% to Verona ADS' last closing price
** The Financial Times first reported the deal on Wednesday
** Up to last close, stock up 87% YTD
(Reporting by Christy Santhosh and Siddhi Mahatole)
((Christy.Santhosh@thomsonreuters.com))