Company:  MERRIMACK PHARMACEUTICALS ... (MACK)
Form Type:  SC 13G
Filing Date:  4/2/2012 
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: 
$6.39   		Change: 
0.01 (0.16%)  
Trade Time: 
Jun 18   		Market Cap: 
$614.00M
Description of Business
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  FORM SC 13G
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