Company:  MERRIMACK PHARMACEUTICALS ... (MACK)
Form Type:  4
Filing Date:  4/5/2012 
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: 
$5.28   		Change: 
-0.24 (-4.35%)  
Trade Time: 
May 20   		Market Cap: 
$507.34M
Description of Business
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  FORM 4
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES
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