** Shares of drugmaker Biogen BIIB.O rise 5.8% to $134 premarket

** Co lifts 2025 adjusted profit per share between $15.50 and $16.00, compared to prior expectations of $14.50 to $15.50

** Analysts expect 2025 profit of $14.68/share

** Co posts Q2 sales of $2.6 billion, above analysts' est of $2.32 billion - LSEG data

** Co reports Q2 profit of $5.47/share, above estimates of $3.86/share

** As of last close, stock down 17% YTD

(Reporting by Kamal Choudhury in Bengaluru)

((Kamal.Choudhury@thomsonreuters.com;))