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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
bluebird bio, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
09609G100
(CUSIP Number)
December 31, 2015
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)
*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information
which would alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
that section of the Act but shall be subject to all other provisions of
the Act (however, see the Notes).
CUSIP: 09609G100 Page 1 of 5
1 NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
The Growth Fund of America
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE
INSTRUCTIONS) (a)
(b)
3 SEC USE ONLY
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Maryland
5 SOLE VOTING POWER
NONE
6 SHARED VOTING POWER
NUMBER OF
SHARES NONE
BENEFICIALL
Y OWNED BY
7 SOLE DISPOSITIVE POWER
EACH
REPORTING NONE
PERSON
WITH:
8 SHARED DISPOSITIVE POWER
NONE
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,352,076 See Additional information in Item 4.
Under certain circumstances The Growth Fund of America may vote the
shares of the fund. These shares may also be reflected in a filing
made by Capital Research Global Investors, Capital International
Investors, and/or Capital World Investors.
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(SEE INSTRUCTIONS)
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
6.4%
12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IV
CUSIP: 09609G100 Page 2 of 5
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
Schedule 13G
Under the Securities Exchange Act of 1934
Amendment No.
Item 1(a) Name of Issuer:
bluebird bio, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
150 Second Street
Cambridge, MA 02141
Item 2(a) Name of Person(s) Filing:
The Growth Fund of America
Item 2(b) Address of Principal Business Office or, if none,
Residence:
333 South Hope Street
Los Angeles, CA 90071
Item 2(c) Citizenship: N/A
Item 2(d) Title of Class of Securities:
Common Stock
Item 2(e) CUSIP Number:
09609G100
Item 3 If this statement is filed pursuant to sections 240.13d-1(b)
or 240.13d-2(b) or (c), check whether the person filing is a:
(d) [X] Investment company registered under section 8
of the Investment Company Act of 1940 (15 U.S.C. 80a-8).
Item 4 Ownership
Provide the following information regarding the aggregate
number and percentage of the class of securities of the issuer
identified in Item 1.
(a) Amount beneficially owned:
(b) Percent of class:
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
(ii) Shared power to vote or to direct the vote:
(iii) Sole power to dispose or to direct the disposition of:
(iv) Shared power to dispose or to direct the disposition of:
See page 2
The Growth Fund of America, an investment company registered
under the Investment Company Act of 1940, which is advised by
Capital Research and Management Company ("CRMC"), is the
beneficial owner of 2,352,076 shares or 6.4% of the 36,676,917
shares believed to be outstanding. CRMC manages equity assets
for various investment companies through three divisions,
Capital Research Global Investors, Capital World Investors, and
CUSIP: 09609G100 Page 3 of 5
Capital International Investors. These divisions generally
function separately from each other with respect to investment
research activities and they make investment decisions and
proxy voting decisions for the investment companies on a
separate basis.
Item 5 Ownership of Five Percent or Less of a Class. If this
statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial
owner of more than five percent of the class of securities,
check the following: [ ]
Item 6 Ownership of More than Five Percent on Behalf of Another
Person: N/A
Item 7 Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent Holding
Company or Control Person: N/A
Item 8 Identification and Classification of Members of the Group:
N/A
Item 9 Notice of Dissolution of Group: N/A
Item 10 Certification
By signing below, I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and
are held in the ordinary course of business and were not
acquired and are not held for the purpose of or with the effect
of changing or influencing the control of the issuer of the
securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose
or effect.
Signature
After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this
statement is true, complete and correct.
Date: February 11, 2016
Signature: Michael W. Stockton***
Name/Title: Michael W. Stockton - Secretary
The Growth Fund of America, Inc.
***By /s/ Michael J. Triessl
Michael J. Triessl
Attorney-in-fact
Signed pursuant to a Power of Attorney dated December 19,
2014 included as an Exhibit to Schedule 13G filed with the
Securities and Exchange Commission by Capital World Investors
on February 6, 2015 with respect to Hudbay Minerals Inc.
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