Company:  BIOGEN IDEC INC. (BIIB)
Form Type:  8-K/A
Filing Date:  2/12/2013 
CIK:  0000875045 
Address:  225 BINNEY STREET 
City, State, Zip:  CAMBRIDGE, Massachusetts 02142 
Telephone:  (781) 464-2000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$306.75  
Change: 
0.55 (0.18%)  
Trade Time: 
04:00 PM EST  
Market Cap: 
$72.51B
Description of Business
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  FORM 8-K/A
    SECTION 9 FINANCIAL STATEMENTS AND EXHIBITS
      Item 9.01. Financial Statements and Exhibits.
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 2.1
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