SEC Form 4 · accession 0001012975-15-000095

bluebird bio, Inc. · BLUE

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Director · 10% Owner

Period of report

Feb 3, 2015

Accepted (ET)

Feb 4, 2015 · 4:34 pm EST

Rule 10b5-1 plan

unknown — predates the checkbox

Issuer CIK

0001293971

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F2	Feb 3, 2015	J	1,215,054	$0.00	D	0	I	See footnote
Common Stock^F4	Feb 3, 2015	J	300,863	$0.00	A	300,863	I	See footnote
Common Stock^F4	Feb 3, 2015	J	300,863	$0.00	D	0	I	See footnote
Common Stock	Feb 3, 2015	J	62,479	$0.00	A	89,017	D

No Table II lines on this filing.

F1Distribution of shares in kind by Third Rock Ventures, L.P. ("TRV")on a pro rata basis to its partners.
F2The 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 the Reporting Person is a Manager of TRV GP LLC, as such, each of TRV GP, TRV GP LLC and the Reporting Person exercises shared voting and investment power over the shares held of record by TRV. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein, if any.
F3TRV GP received shares distributed in kind by TRV on a pro rata basis to its partners.
F4The shares are directly held by TRV GP. As such, TRV GP LLC and the Reporting Person, as a Manager of TRV GP LLC, exercise 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.
F5Distribution of shares in kind by TRV GP on a pro rata basis to its partners.
F6The Reporting Person received shares distributed in kind by TRV GP on a pro rata basis to its partners.