Alkermes Plc. (ALKS)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	27,406,368	$904,958,288	0.02%
2.	Vanguard Group Inc	18,212,674	$601,382,495	0.01%
3.	State Street Corp	8,022,670	$264,908,563	0.01%
4.	Rtw Investments, Llc	6,884,698	$227,332,728	3.48%
5.	Jpmorgan Chase & Co	5,234,995	$172,859,555	0.01%