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Filing Details

Accession Number:: 0001012975-14-000560
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2014-09-12 16:11:11
Reporting Period:: 2014-09-11

Filing Date:: 2014-09-12
Accepted Time:: 2014-09-12 16:11:11
SEC Url:: Form 4 Filing

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	Insider Title	Director	Officer	Large Shareholder	Other
1192595	I Robert Tepper	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116		Yes	No	Yes	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2014-09-11	87,000	$36.52	2,329,974	No	4	S	Indirect	See footnote
Common Stock	Disposition	2014-09-11	1,076,920	$0.00	1,253,054	No	4	J	Indirect	See footnote
Common Stock	Acquisiton	2014-09-11	79,062	$0.00	79,062	No	4	J	Indirect	See footnote
Common Stock	Disposition	2014-09-11	79,062	$0.00	0	No	4	J	Indirect	See footnote
Common Stock	Acquisiton	2014-09-11	11,449	$0.00	26,538	No	4	J	Direct
Common Stock	Disposition	2014-09-12	38,000	$36.59	1,215,054	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote
No	4	J	Indirect	See footnote
No	4	J	Indirect	See footnote
No	4	J	Indirect	See footnote
No	4	J	Direct
No	4	S	Indirect	See footnote

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.00 to $36.95, inclusive. The 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 (the "SEC"), 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 Third Rock Ventures, L.P. ("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. As a manager of TRV GP LLC, the Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein, if any.
Distribution of shares in kind by TRV on a pro rata basis to its partners.
TRV GP received shares distributed in kind by TRV on a pro rata basis to its partners.
The shares are directly held by TRV GP. As such, TRV GP LLC and the Reporting Person, exercises voting and investment power over the shares held of record by TRV GP. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein, if any.
Distribution of shares in kind by TRV GP on a pro rata basis to its partners.
The Reporting Person received shares distributed in kind by TRV GP on a pro rata basis to its partners.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $36.25 to $37.005, inclusive. Each Reporting Person undertakes to provide to bluebird bio Inc., any security holder of bluebird bio Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.