Company:  ARENA PHARMACEUTICALS INC (ARNA)
Form Type:  S-3ASR
Filing Date:  5/15/2012 
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: 
$7.99   		Change: 
0.03 (0.38%)  
Trade Time: 
04:00 PM EST   		Market Cap: 
$1.74B
Description of Business
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  FORM S-3ASR
    CALCULATION OF REGISTRATION FEE
    TABLE OF CONTENTS
    ABOUT THIS PROSPECTUS
    RISK FACTORS
    SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
    USE OF PROCEEDS
    DESCRIPTION OF CAPITAL STOCK
    Transfer Agent and Registrar
    PLAN OF DISTRIBUTION
    LEGAL MATTERS
    EXPERTS
    WHERE YOU CAN FIND MORE INFORMATION
    PART II
      Item 14. Other Expenses of Issuance and Distribution.
      Item 15. Indemnification of Directors and Officers.
      Item 16. Exhibits.
      Item 17. Undertakings.
    SIGNATURES
    POWER OF ATTORNEY
    EXHIBIT INDEX
  EXHIBIT 5.1
  EXHIBIT 23.2
    Consent of Independent Registered Public Accounting Firm
  EXHIBIT 23.3
    Consent of Independent Registered Public Accounting Firm
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