Company:  MERRIMACK PHARMACEUTICALS ... (MACK)
Form Type:  3
Filing Date:  2/1/2012 
CIK:  0001274792 
Address:  ONE KENDALL SQUARE
SUITE B7201 
City, State, Zip:  CAMBRIDGE, Massachusetts 02139 
Telephone:  617-441-1000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$6.42   		Change: 
0.03 (0.47%)  
Trade Time: 
Jun 19   		Market Cap: 
$616.88M
Description of Business
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  FORM 3
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES
  EXHIBIT 24
    LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS
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