SEC Form 4 · accession 0001209191-18-050075

bluebird bio, Inc. · BLUE

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

Reporting owner

Philip D Gregory

Officer — Chief Scientific Officer

Period of report

Sep 5, 2018

Accepted (ET)

Sep 7, 2018 · 4:32 pm EDT

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
Common Stock	Sep 5, 2018	M	600	$50.51	A	32,971	D
Common Stock	Sep 5, 2018	M	700	$75.60	A	33,671	D
Common Stock^F2	Sep 5, 2018	S	777	$161.8295	D	32,894	D
Common Stock^F3	Sep 5, 2018	S	510	$162.9039	D	32,384	D
Common Stock^F4	Sep 5, 2018	S	213	$164.0317	D	32,171	D
Common Stock^F5	Sep 5, 2018	S	200	$165.275	D	31,971	D
Common Stock	Sep 5, 2018	S	100	$166.25	D	31,871	D

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Stock Option (right to buy)^F6	$50.51	Sep 5, 2018	M	600	D	—	Mar 1, 2026	Common Stock	600	15,800	D
Stock Option (right to buy)^F7	$75.60	Sep 5, 2018	M	700	D	—	Feb 1, 2027	Common Stock	700	32,700	D

Explanation of responses

F1The sales reported in this Form 4 were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on July 2, 2018.
F2The range in prices for the transaction reported on this line was $161.25 to $162.15. The average weighted price was $161.8295. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
F3The range in prices for the transaction reported on this line was $162.50 to $163.45. The average weighted price was $162.9039. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
F4The range in prices for the transaction reported on this line was $163.60 to $164.50. The average weighted price was $164.0317. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
F5The range in prices for the transaction reported on this line was $165.05 to $165.50. The average weighted price was $165.2750. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
F6This option vests over a four-year period, at a rate of twenty-five percent (25%) on January 4, 2017 and in 36 equal monthly installments thereafter.
F7This option vests over a four-year period, at a rate of twenty-five percent (25%) on January 4, 2018 and in 36 equal monthly installments thereafter.