Company:  ARENA PHARMACEUTICALS INC (ARNA)
Form Type:  10-K
Filing Date:  3/15/2012 
CIK:  0001080709 
Address:  6154 NANCY RIDGE DRIVE 
City, State, Zip:  SAN DIEGO, California 92121 
Telephone:  858-453-7200 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$7.98   		Change: 
-0.02 (-0.25%)  
Trade Time: 
May 17   		Market Cap: 
$1.74B
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 Financial Data.
      Item 7. Management's Discussion and Analysis of Financial ...
        INCOME STATEMENT
        LIQUIDITY AND CAPITAL RESOURCES
      Item 7A. Quantitative and Qualitative Disclosures About ...
      Item 8. Financial Statements and Supplementary Data.
        Report of Independent Registered Public Accounting Firm
        Report of Independent Registered Public Accounting Firm
        BALANCE SHEET
        INCOME STATEMENT
        STOCKHOLDERS EQUITY
        STOCKHOLDERS EQUITY
        CASH FLOW
        Notes to Consolidated Financial Statements
          BALANCE SHEET
      Item 9. Changes in and Disagreements With Accountants on ...
      Item 9A. Controls and Procedures.
      Report of Independent Registered Public Accounting Firm
      Item 9B. Other Information.
    PART III
      Item 10. Directors, Executive Officers and Corporate Governance.
      Item 11. Executive Compensation.
      Item 12. Security Ownership of Certain Beneficial Owners and ...
      Item 13. Certain Relationships and Related Transactions, and ...
      Item 14. Principal Accountant Fees and Services.
    PART IV
      Item 15. Exhibits, Financial Statement Schedules.
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 3.8
  EXHIBIT 10.36
  EXHIBIT 21.1
  EXHIBIT 23.1
    Consent of Independent Registered Public Accounting Firm
  EXHIBIT 23.2
    Consent of Independent Registered Public Accounting Firm
  EXHIBIT 31.1
    CERTIFICATION
  EXHIBIT 31.2
    CERTIFICATION
  EXHIBIT 32.1
    CERTIFICATION PURSUANT TO
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