Bluebird Bio Inc. (BLUE)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	State Street Corp	13,865,719	$19,134,692	0%
2.	Blackrock Inc.	8,983,001	$12,396,541	0%
3.	Vanguard Group Inc	8,775,379	$12,110,023	0%
4.	Granahan Investment Management Inc	8,077,697	$11,147,222	0.36%
5.	Pictet Asset Management Holding Sa	5,687,334	$7,848,521	0%