Alkermes Plc. (ALKS)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	27,856,163	$796,964,824	0.02%
2.	Vanguard Group Inc	18,503,074	$529,372,946	0.01%
3.	State Street Corp	8,208,256	$234,838,204	0.01%
4.	Jpmorgan Chase & Co	4,836,294	$138,366,386	0.01%
5.	Rtw Investments, Llc	4,682,289	$133,960,288	1.91%