CAMBRIDGE, Mass.--(BUSINESS WIRE)--Biogen Idec Inc. (NASDAQ: BIIB) today announced the preliminary results of its modified “Dutch Auction” tender offer which expired at 12:00 midnight ET on Tuesday, June 26, 2007. Biogen Idec expects to accept for payment an aggregate of 56,428,198 shares of its common stock at a purchase price of $53 per share, for an aggregate share repurchase of approximately $3 billion. These shares represent approximately 16.4 percent of the shares outstanding as of June 25, 2007.