<SEC-DOCUMENT>0000902219-18-000531-index.html : 20181113
<SEC-HEADER>0000902219-18-000531.hdr.sgml : 20181113
<ACCEPTANCE-DATETIME>20181113080735
ACCESSION NUMBER:		0000902219-18-000531
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20181113
DATE AS OF CHANGE:		20181113

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			bluebird bio, Inc.
		CENTRAL INDEX KEY:			0001293971
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-87526
		FILM NUMBER:		181175247

	BUSINESS ADDRESS:	
		STREET 1:		60 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		339-499-9300

	MAIL ADDRESS:	
		STREET 1:		60 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Genetix Pharmaceuticals Inc
		DATE OF NAME CHANGE:	20040616

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WELLINGTON MANAGEMENT GROUP LLP
		CENTRAL INDEX KEY:			0000902219
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				042683227
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		C/O WELLINGTON MANAGEMENT COMPANY LLP
		STREET 2:		280 CONGRESS STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		6179515000

	MAIL ADDRESS:	
		STREET 1:		C/O WELLINGTON MANAGEMENT COMPANY LLP
		STREET 2:		280 CONGRESS STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WELLINGTON MANAGEMENT CO LLP
		DATE OF NAME CHANGE:	19960930

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WELLINGTON MANAGEMENT CO
		DATE OF NAME CHANGE:	19930426
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>SEC13G_Filing.htm
<DESCRIPTION>SEC SCHEDULE 13G
<TEXT>
Document 1 - file: SEC13G_Filing.htm

</DOCUMENT>
</SEC-DOCUMENT>