Updates
** U.S.-listed shares of lung therapy firm Verona Pharma VRNA.O I9SAy.F jump 20.7% to all-time high of $104.81
** Verona set of its best day in over 2 years, if gains hold
** Merck MRK.N will buy London-based Verona for about $10 billion
** Merck will pay $107 per American depository share for Verona
** Shares of Merck up 2.5% at $83.40
** The purchase price is a premium of about 23% to Verona ADS' last closing price
** The Financial Times first reported the deal on Wednesday
** Including session moves, Verona up 125.7%, Merck down 16.3% YTD
(Reporting by Christy Santhosh, Siddhi Mahatole and Kamal Choudhury)
((Christy.Santhosh@thomsonreuters.com))