DAVIDSON DAVID (Chief Medical Officer) sold 13.4% of their position (4.91K shares) of BLUEBIRD BIO, INC. on the open market

Open‑market sale worth $659.4K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

DAVIDSON DAVID

Filed: 2/5/2019ACC: 0001209191-19-007468

InsiderDAVIDSON DAVIDCIK 1578696

→

IssuerBLUEBIRD BIO, INC.CIK 1293971

Officer· Chief Medical Officer

Since Jul 2018

+41.97K

Net shares

Net buyer

$659.4K

Total sold

Open market trades

0B · 3S

Total transactions

51.78K acquired · 9.82K disposed

Non-Derivative Transactions6

Common Stock

Direct

A · Award

+9.38K

Price / share

—

Trade value

—

% of position

42.2%

2/1/2019

22.24K→31.62K

Common Stock

Direct

M · Option Exercise

+3.56K

Price / share

$24.47

Trade value

$86.99K

% of position

11.2%

2/4/2019

31.62K→35.17K

Common Stock

Direct

M · Option Exercise

+1.35K

Price / share

$50.51

Trade value

$68.44K

% of position

3.9%

2/4/2019

35.17K→36.53K

Common Stock

Direct

S · Sale

−600.00

Price / share

$133.13

Trade value

$79.88K

% of position

1.6%

2/4/2019

36.53K→35.93K

Common Stock

Direct

S · Sale

−3.11K

Price / share

$134.22

Trade value

$417.41K

% of position

8.7%

2/4/2019

35.93K→32.82K

Common Stock

Direct

S · Sale

−1.20K

Price / share

$135.10

Trade value

$162.12K

% of position

3.7%

2/4/2019

32.82K→31.62K

Total

Net shares

+9.38K

Net value

-$503.98K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	2/1/2019	A · Award	+9.38K	—	—	42.2%	22.24K	31.62K
Common Stock Direct	2/4/2019	M · Option Exercise	+3.56K	$24.47	$86.99K	11.2%	31.62K	35.17K
Common Stock Direct	2/4/2019	M · Option Exercise	+1.35K	$50.51	$68.44K	3.9%	35.17K	36.53K
Common Stock Direct	2/4/2019	S · Sale	−600.00	$133.13	$79.88K	1.6%	36.53K	35.93K
Common Stock Direct	2/4/2019	S · Sale	−3.11K	$134.22	$417.41K	8.7%	35.93K	32.82K
Common Stock Direct	2/4/2019	S · Sale	−1.20K	$135.10	$162.12K	3.7%	32.82K	31.62K
Total			+9.38K		-$503.98K

Derivative Transactions3

Stock Option (right to buy)

Direct

A · Award

Converts to

Common Stock

37.50K shares

+37.50K

Strike price

134.63

Held after

37.50K

Exercisable

—

2/1/2019

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

3.56K shares

−3.56K

Strike price

24.47

Held after

3.61K

Exercisable

—

2/4/2019

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

1.35K shares

−1.35K

Strike price

50.51

Held after

37.05K

Exercisable

—

2/4/2019

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Common Stock37.50K shares	2/1/2019	A · Award	+37.50K	134.63	—	37.50K
Stock Option (right to buy) Direct	Common Stock3.56K shares	2/4/2019	M · Option Exercise	−3.56K	24.47	—	3.61K
Stock Option (right to buy) Direct	Common Stock1.35K shares	2/4/2019	M · Option Exercise	−1.35K	50.51	—	37.05K