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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1293971	Bluebird Bio Inc.	BLUE	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1408591	Third Rock Ventures Lp	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1578973	Trv Gp, Llc	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1578976	Third Rock Ventures Gp, L.p.	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2014-01-21	250,000	$23.91	2,416,974	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.75 to $24.35, inclusive. Each Reporting Person undertakes to provide to bluebird bio Inc., any security holder of bluebird bio Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
The shares are directly held by TRV. The general partner of TRV is Third Rock Ventures GP, L.P. ("TRV GP"). The general partner of TRV GP is TRV GP, LLC ("TRV GP LLC") and, as such, each of TRV GP and TRV GP LLC exercises shared voting and investment power over the shares held of record by TRV. Each of the filing persons disclaims beneficial ownership of the shares except to the extent of their pecuniary interest therein, if any.