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<p style="margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-size:1pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p>
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<p style="text-align:center;margin-top:4pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:18pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">UNITED STATES </p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-weight:bold;font-size:18pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">SECURITIES AND EXCHANGE COMMISSION </p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-weight:bold;font-size:12pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Washington, D.C. 20549 </p>
<p style="text-align:center;margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:18pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">FORM 8-K </p>
<p style="text-align:center;margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:12pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">CURRENT REPORT</p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-weight:bold;font-size:12pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Pursuant to Section&#160;13 or 15(d) of The Securities Exchange Act of 1934</p>
<p style="text-align:center;margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:12pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Date of Report (Date of Earliest Event Reported):  January 12, 2015</p>
<p style="text-align:center;margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:24pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">bluebird bio, Inc.</p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(Exact name of registrant as specified in its charter)</p>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:1pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(State or other jurisdiction of <br>incorporation) </p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(Commission File Number) </p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(I.R.S. Employer<br>Identification No.)</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;">&nbsp;</p>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">150 Second Street</p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Cambridge, MA</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">02141</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:1pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&nbsp;</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:1pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(Address of principal executive offices) </p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">(Zip Code)</p></td>
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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-size:10pt;">&nbsp;</p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Registrant&#8217;s telephone number, including area code (339) 499-9300</p>
<p style="text-align:center;margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Not Applicable</p>
<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-size:8pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> (Former name or former address, if changed since last report)</p>
<p style="margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: </p>
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<p style="margin-top:6pt;margin-bottom:0pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;font-family:Times New Roman;font-size:10pt;">Written communications pursuant to Rule&#160;425 under the Securities Act (17 CFR 230.425) </p></td></tr></table></div>
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<p style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"><font style="font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"></font><font style="font-size:10pt;font-family:'Wingdings'">&#111;</font></p></td>
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<p style="margin-top:6pt;margin-bottom:0pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;font-family:Times New Roman;font-size:10pt;">Soliciting material pursuant to Rule&#160;14a-12 under the Exchange Act (17 CFR 240.14a-12) </p></td></tr></table></div>
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<p style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"><font style="font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"></font><font style="font-size:10pt;font-family:'Wingdings'">&#111;</font></p></td>
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<p style="margin-top:6pt;margin-bottom:0pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;font-family:Times New Roman;font-size:10pt;">Pre-commencement communications pursuant to Rule&#160;14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </p></td></tr></table></div>
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<p style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"><font style="font-size:10pt;font-family:'Wingdings';font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"></font><font style="font-size:10pt;font-family:'Wingdings'">&#111;</font></p></td>
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<p style="margin-top:6pt;margin-bottom:0pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;font-family:Times New Roman;font-size:10pt;">Pre-commencement communications pursuant to Rule&#160;13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </p></td></tr></table></div>

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<p style="margin-top:6pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Item 2.02 Results of Operations and Financial Condition. </p>
<p style="margin-top:6pt;margin-bottom:0pt;text-indent:5.24%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">See Item 7.01 below, which is incorporated by reference herein. </p>
<p style="margin-top:18pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Item 7.01 Regulation FD Disclosure. </p>
<p style="margin-top:6pt;margin-bottom:0pt;text-indent:5.24%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">The Company announced its intention to share with investors the amount of cash, cash equivalents and marketable securities it had on hand as of December 31, 2014. Although the Company has not finalized its financial results for the twelve months ended December 31, 2014, the Company currently anticipates that its cash, cash equivalents and marketable securities were approximately $492 million as of December 31, 2014. This information is unaudited and does not present all information necessary for an understanding of the Company&#8217;s financial condition as of December 31, 2014 and its results of operations for the twelve months ended December 31, 2014. The Company expects to announce its full results for the twelve months ended December 31, 2014 on or before March 2, 2015.</p>
<p style="margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-style:italic;font-size:10pt;font-family:Times New Roman;font-weight:normal;text-transform:none;font-variant: normal;">The information in this report furnished pursuant to Items 2.02 and 7.01 shall not be deemed &#8220;filed&#8221; for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the &#8220;Exchange Act&#8221;), or otherwise subject to the liabilities of that section. It may only be incorporated by reference in another filing under the Exchange Act or the Securities Act of 1933, as amended, if such subsequent filing specifically references the information furnished pursuant to Items 2.02 and 7.01 of this report.</p>
<p style="margin-top:12pt;margin-bottom:0pt;text-indent:0%;font-size:12pt;">&nbsp;</p>

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<p style="text-align:center;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">SIGNATURES</p>
<p style="margin-top:12pt;margin-bottom:0pt;text-indent:7.69%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. </p>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Date: January 12, 2015</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">bluebird bio, Inc.</p>
<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"><br>&#160;</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">By: </p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">/s/ James DeTore</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">James DeTore</p></td>
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<p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">&#160;</p></td>
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{"company-data": {"conformed-name": "bluebird bio, Inc.", "cik": "0001293971", "assigned-sic": "2836", "irs-number": "000000000", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-35966", "film-number": "15520659"}, "business-address": {"street1": "150 SECOND STREET", "city": "CAMBRIDGE", "state": "MA", "zip": "02141", "phone": "339-499-9300"}, "mail-address": {"street1": "150 SECOND STREET", "city": "CAMBRIDGE", "state": "MA", "zip": "02141"}, "former-company": {"former-conformed-name": "Genetix Pharmaceuticals Inc", "date-changed": "20040616"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934
Date of Report (Date of Earliest Event Reported):  January 12, 2015
bluebird bio, Inc.
(Exact name of registrant as specified in its charter)
DELAWARE
001-35966
13-3680878
(State or other jurisdiction of
incorporation)
(Commission File Number)
(I.R.S. Employer
Identification No.)
150 Second Street
Cambridge, MA
02141
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area code (339) 499-9300
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 2.02 Results of Operations and Financial Condition.
See Item 7.01 below, which is incorporated by reference herein.
Item 7.01 Regulation FD Disclosure.
The Company announced its intention to share with investors the amount of cash, cash equivalents and marketable securities it had on hand as of December 31, 2014. Although the Company has not finalized its financial results for the twelve months ended December 31, 2014, the Company currently anticipates that its cash, cash equivalents and marketable securities were approximately $492 million as of December 31, 2014. This information is unaudited and does not present all information necessary for an understanding of the Company's financial condition as of December 31, 2014 and its results of operations for the twelve months ended December 31, 2014. The Company expects to announce its full results for the twelve months ended December 31, 2014 on or before March 2, 2015.
The information in this report furnished pursuant to Items 2.02 and 7.01 shall not be deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section. It may only be incorporated by reference in another filing under the Exchange Act or the Securities Act of 1933, as amended, if such subsequent filing specifically references the information furnished pursuant to Items 2.02 and 7.01 of this report.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: January 12, 2015
bluebird bio, Inc.
By:
/s/ James DeTore
James DeTore
Chief Financial Officer and Treasurer