Company:  BIOGEN IDEC INC. (BIIB)
Form Type:  8-K
Filing Date:  2/6/2013 
CIK:  0000875045 
Address:  225 BINNEY STREET 
City, State, Zip:  CAMBRIDGE, Massachusetts 02142 
Telephone:  (781) 464-2000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$290.54  
Change: 
-0.94 (-0.32%)  
Trade Time: 
Apr 17  
Market Cap: 
$68.68B
Description of Business
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  FORM 8-K
    SECTION 1 BUSINESS AND OPERATIONS
      Item 1.01. Entry into a Material Definitive Agreement.
    SECTION 8 OTHER EVENTS
      Item 8.01. Other Events.
    SECTION 9 FINANCIAL STATEMENTS AND EXHIBITS
      Item 9.01. Financial Statements and Exhibits.
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 99.1
  EXHIBIT 99.2
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