
Shares of drug developer Sage Therapeutics SAGE.O rise about 33% to $7.38 in extended trading
Biogen BIIB.O sends letter to SAGE CEO offering to buy all outstanding shares of the company it does not already own
BIIB offers to buy all SAGE shares for $7.22 per share in cash, implying a total deal value of $441.7 mln, according to Reuters calculations
BIIB, which is SAGE's largest shareholder, currently owns 10.2% or over 6.24 mln shares of SAGE common stock
The share price offered implies a 30% premium to SAGE's closing price on Friday
SAGE stock fell ~75% in 2024
(Reporting by Vallari Srivastava in Bengaluru)
((Srivastava.Vallari@thomsonreuters.com;))