Company:  BIOGEN IDEC INC. (BIIB)
Form Type:  10-K
Filing Date:  2/5/2013 
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: 
Apr 23  
Market Cap: 
$72.51B
Description of Business
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  FORM 10-K
    PART I
      Item 1. Business
      Item 1A. Risk Factors
      Item 1B. Unresolved Staff Comments
      Item 2. Properties
      Item 3. Legal Proceedings
      Item 4. Mine Safety Disclosures
    PART II
      Item 5. Market for Registrant's Common Equity, Related ...
      Item 6. Selected Consolidated Financial Data
      Item 7. Management's Discussion and Analysis of ...
        BENEFICIAL OWNERS
        Results of Operations
          INCOME STATEMENT
          BALANCE SHEET
      Item 7A. Quantitative and Qualitative Disclosures About ...
      Item 9A. Controls and Procedures
    PART III
      Item 10. Directors, Executive Officers and Corporate ...
    PART IV
      Item 15. Exhibits, Financial Statement Schedules
    SIGNATURES
    INCOME STATEMENT
    BALANCE SHEET
    CASH FLOW
    STOCKHOLDERS EQUITY
    STOCKHOLDERS EQUITY
    STOCKHOLDERS EQUITY
    NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
      BALANCE SHEET
      INCOME STATEMENT
      INCOME STATEMENT
      INCOME STATEMENT
      INCOME STATEMENT
      INCOME STATEMENT
    REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
    EXHIBIT INDEX
  EXHIBIT 10.49
  EXHIBIT 21
    SUBSIDIARIES
  EXHIBIT 23
    CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
  EXHIBIT 31.1
    CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO
  EXHIBIT 31.2
    CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO
  EXHIBIT 32.1
    CERTIFICATION
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