Company:  MERRIMACK PHARMACEUTICALS ... (MACK)
Form Type:  4/A
Filing Date:  5/1/2012 
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: 
$5.20   		Change: 
-0.06 (-1.14%)  
Trade Time: 
May 24   		Market Cap: 
$499.66M
Description of Business
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  FORM 4/A
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES
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