Remember not so long ago BLACKROCK used to be the major Insto holder...
JPMORGAN: 03/31/2012 : 4,417,388
VANGUARD: 03/31/2012 : 2,985,410
FMR LLC: 12/31/2011 : 2,000,000
BLACKROCK FUND: 03/31/2012 : 1,364,996
STATE STREET: 03/31/2012 : 1,162,240
Read more: http://www.nasdaq.com/symbol/unis/institutional-holdings/
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