Ironwood Pharmaceuticals Inc (IRWD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	23,037,335	$102,055,393	0%
2.	Vanguard Group Inc	19,538,555	$86,555,798	0%
3.	Pacer Advisors, Inc.	11,730,771	$51,967,316	0.11%
4.	Ubs Group AgCALL	11,200,320	$49,617,418	0.02%
5.	State Street Corp	8,328,817	$36,896,659	0%