Company:  BIOGEN IDEC INC. (BIIB)
Form Type:  8-K
Filing Date:  2/6/2009 
CIK:  0000875045 
Address:  14 CAMBRIDGE CENTER 
City, State, Zip:  CAMBRIDGE, Massachusetts 02142 
Telephone:  (617) 679-2000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$46.38  
Change: 
0.53 (1.16%)  
Trade Time: 
Nov 20  
Market Cap: 
$13.41B
Description of Business
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  FORM 8-K
    SECTION 8 OTHER EVENTS
      Item 8.01 Other Events.
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 99.1