Bluebird Bio Inc. (BLUE)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Group One Trading, L.p.CALL	3,875,200	$18,910,976	0.05%
2.	Blackrock, Inc.	697,973	$3,406,110	0%
3.	Vanguard Group Inc	518,238	$2,529,001	0%
4.	Group One Trading, L.p.PUT	389,200	$1,899,296	0.01%
5.	Susquehanna International Group, LlpPUT	286,300	$1,397,144	0%