Ptc Therapeutics Inc. (PTCT)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	8,607,372	$438,631,678	0.01%
2.	Blackrock, Inc.	7,768,217	$395,868,338	0.01%
3.	Rtw Investments, Llc	7,483,127	$381,340,152	5.83%
4.	Wellington Management Group Llp	5,419,172	$276,161,004	0.05%
5.	Henderson Group Plc	2,916,729	$158,151,955	0.09%