|Issuer:||BLUEBIRD BIO, INC. (BLUE)|
|Original Submission Date:|
C/O BLUEBIRD BIO, INC.
60 BINNEY STREET CAMBRIDGE, MA 02142
|Title of Security||Transaction Date||2a. Deemed Execution Date||Transaction Code||Shares||Acquired or Disposed||Price per share||5. Amount of Securities Beneficially Owned Following Reported Transaction||6. Ownership Form Direct or Indirect||Nature of Indirect Ownership|
|Title of Derivative Security||Conversion or Exercise Price of Derivative Security||Transaction Date||Deemed Execution Date||Transaction Code||Number of Derivative Securities Acquired (A) or Disposed of (D)||Date Exercisable||Expiration Date||Title and Amount of Securities Underlying Derivative Security||Price of Derivative Security||Number of derivative Securities Beneficially Owned Following Reported Transaction(s)||Ownership Form: Direct (D) or Indirect (I)||Nature of Indirect Beneficial Ownership|
|f1||shares were sold to cover tax withholding obligations incurred in connection with the vesting of restricted stock units.|
|f2||the range in prices for the transaction reported on this line was $29.85 to $30.42. the average weighted price was $30.1511. 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.|