Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Finer Mitchell H.
 2. Date of Event Requiring Statement (Month/Day/Year)
06/18/2013		 3. Issuer Name and Ticker or Trading Symbol
bluebird bio, Inc. [BLUE]
(Last)
(First)
(Middle)
C/O BLUEBIRD BIO, INC., 840 MEMORIAL DRIVE, 4TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Scientific Officer
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CAMBRIDGE, MA 02139		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy)   (1) 09/15/2020 Common Stock 109,769 $ 0.95 D  
Stock Option (right to buy)   (2) 07/13/2021 Common Stock 43,170 $ 2.09 D  
Stock Option (right to buy)   (3) 07/13/2021 Common Stock 25,500 $ 2.09 D  
Stock Option (right to buy)   (4) 06/04/2022 Common Stock 26,361 $ 2.09 D  
Stock Option (right to buy)   (5) 01/16/2023 Common Stock 165,047 $ 5.5 D  
Stock Option (right to buy)   (6) 04/29/2023 Common Stock 527 $ 8.16 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Finer Mitchell H.
C/O BLUEBIRD BIO, INC.
840 MEMORIAL DRIVE, 4TH FLOOR
CAMBRIDGE, MA 02139		       Chief Scientific Officer  

Signatures

/s/ Linda C. Bain, Attorney-in-Fact 06/18/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This option vests in 48 equal monthly installments, commencing on March 8, 2010.
(2) This option vests at a rate of twenty-five percent (25%) on April 15, 2012 and in 36 equal monthly installments thereafter.
(3) This option vests as follows: (i) 12,750 shares vest at a rate of twenty-five percent (25%) on April 15, 2012 and in 36 equal monthly installments thereafter; and (ii) 12,750 shares vest at a rate of twenty-five percent (25%) on May 1, 2013 and in 36 equal monthly installments thereafter.
(4) This option vests at a rate of twenty-five percent (25%) on May 1, 2013 and in 36 equal monthly installments thereafter.
(5) This option vests as follows: (i) 107,281 shares vest at a rate of twenty-five percent (25%) on January 1, 2014 and in 36 equal monthly installments thereafter; (ii) 16,504 shares vest at a rate of twenty-five percent (25%) on April 1, 2014 and in 36 equal monthly installments thereafter; and (iii) 41,262 shares vest at a rate of twenty-five percent (25%) on May 1, 2014 and in 36 equal monthly installments thereafter.
(6) This option is fully vested.

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