Item 5.07 Submission of Matters to a Vote of Security Holders.





On June 15, 2021, bluebird bio, Inc. (the "Company") held its previously
announced Annual Meeting of Stockholders (the "Meeting"), at which a quorum was
present. At the Meeting, the stockholders of the Company voted on the proposals
as follows: (i) John O. Agwunobi, M.D., Daniel S. Lynch, and William R. Sellers,
M.D. as Class II members of the Board to serve until the Company's 2024 annual
meeting of stockholders ("Proposal 1"); (ii) to approve, on a non-binding
advisory basis, the compensation paid to the Company's named executive officers
("Proposal 2"); (iii) the frequency of future non-binding advisory votes on the
compensation of the Company's named executive officers ("Proposal 3"); (iv) to
approve an amendment to the Company's 2013 Employee Stock Purchase Plan
("Proposal 4"), and (v) ratify the selection of Ernst & Young LLP as the
Company's independent registered public accounting firm for the fiscal year
ending December 31, 2021 ("Proposal 5").

The Company's stockholders re-elected the three persons listed below as Class II directors pursuant to Proposal 1. The voting results were as follows:


                                                 Votes For            Votes Against            Abstentions            Broker Non-Votes
       John O. Agwunobi, M.D.                   30,724,366              10,266,016               117,556                 8,990,117
       Daniel S. Lynch                          39,876,650              1,109,554                121,734                 8,990,117
       William R. Sellers, M.D.                 40,679,679               306,213                 122,046                 8,990,117

The Company's stockholders approved Proposal 2 in a non-binding advisory vote. The voting results were as follows:

Votes For Votes Against Abstentions Broker Non-Votes

38,890,700 1,971,886 245,352 8,990,117




The Company's stockholders voted once every year for Proposal 3. The voting
results were as follows:
      1 Year      2 Years     3 Years    Abstentions
    40,627,097    146,506     274,171       60,164



The Company's stockholders approved Proposal 4. The voting results were as
follows:
    Votes For     Votes Against    Abstentions     Broker Non-Votes
    40,467,196       557,457          83,285          8,990,117



The Company's stockholders approved Proposal 5. The voting results were as
follows:

    Votes For     Votes Against    Abstentions     Broker Non-Votes
    49,526,131       453,658         118,266              0

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