Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): August 8, 2023
bluebird bio, Inc.
(Exact name of Registrant as Specified in Its Charter)
(State or Other Jurisdiction
of Incorporation)
(Commission File Number)(IRS Employer
Identification No.)
455 Grand Union Boulevard,
Somerville, MA
(Address of Principal Executive Offices)(Zip Code)
(339) 499-9300
(Registrant’s telephone number, including area code)
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 (see General Instructions A.2. below):
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading
Name of each exchange on which registered
Common Stock, $0.01 par value per shareBLUEThe Nasdaq Stock Market LLC
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 

Item 7.01
Regulation FD Disclosure.

On August 8, 2023, bluebird bio, Inc. (the "Company") held a conference call and audio webcast at 8:00 a.m. Eastern Time (“Earnings Call”) in which it discussed its second quarter 2023 results and provided a commercial update. During the Earnings Call, the Company provided an investor presentation, dated August 8, 2023 (the “Presentation”), which is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Presentation will also be posted on the Company’s website and can be accessed at The Company expressly disclaims any obligation to update the Presentation, or any other information posted on or available through its website, and cautions that the information set forth therein is only accurate as of the date indicated on such materials. The inclusion of any data or statements in the Presentation (or available on or through the Company’s website) does not signify that such information is considered material.

The information in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is intended to be furnished and shall not be deemed “filed” for 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, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, as expressly set forth by specific reference in such filing.

Item 9.01
Financial Statements and Exhibits.

(d)    Exhibits

104Cover Page Interactive Data File (embedded within the Inline XBRL document)


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: August 8, 2023bluebird bio, Inc.
By:/s/ Christopher Krawtschuk
Name:Christopher Krawtschuk
Chief Financial Officer, Principal Financial Officer and Principal Accounting Officer

Q2 Earnings Call & Commercial Launch Update August 8, 2023 NASDAQ: BLUE Exhibit 99.1

CONFIDENTIAL This presentation contains certain statements that are forward-looking within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and that involve risks and uncertainties, including without limitations statements regarding the Company’s financial condition, results of operations, commercial revenue and key metrics, including the expected number of patient starts, and anticipated reporting and timing thereof; anticipated cash runway, including restricted cash; and anticipated cash burn for 2023 as well as statements regarding the Company’s plans and expectations for operations including expected timing relating to its regulatory approvals, plans to expand manufacturing capacity, anticipated growth of its QTC network and timing thereof, plans for future regulatory submissions, the expected timing for the potential PDUFA acceptance and regulatory approval of lovo-cel by FDA, and the timing of commercial launch of lovo- cel, if approved. Statements using words such as "expect", "anticipate", "believe", "may", "will" and similar terms are also forward-looking statements. Such statements are subject to numerous risks and uncertainties, including but not limited to, delays and challenges in our commercialization and manufacturing of our products, including risks associated with demonstrating analytical comparability with respect to our lovo-cel program; we may encounter additional delays in the development of our programs, including the imposition of new clinical holds, that may impact our ability to meet our expected timelines and increase our costs; the internal and external costs required for our ongoing and planned activities, and the resulting impact on expense and use of cash, has been, and may in the future be, higher than expected which has caused us, and may in the future cause us to use cash more quickly than we expect or change or curtail some of our plans or both; substantial doubt exists regarding our ability to continue as a going concern; our expectations as to expenses, cash usage and cash needs may prove not to be correct for other reasons such as changes in plans or actual events being different than our assumptions; the risk that the efficacy and safety results from our prior and ongoing clinical trials will not continue or be seen in additional patients treated with our product candidates; the risk that additional insertional oncogenic or other reportable events associated with lentiviral vector, drug product, or myeloablation will be discovered or reported over time; the risk that any one or more of our products or product candidates, including eli-cel, beti-cel or lovo-cel, will not be successfully developed, approved or commercialized, as applicable, and other risks as may be detailed from time to time in our Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q and other reports we file with the Securities and Exchange Commission. Except as required by law, we undertake no obligations to make any revisions to the forward-looking statements contained in this presentation or to update them to reflect events or circumstances occurring after the date of this presentation, whether as a result of new information, future developments or otherwise. forward-looking statements 2

CONFIDENTIAL 3 Outlook and Q2 2023 key business updates Andrew Obenshain, chief executive officer Commercial launch progress Tom Klima, chief commercial and operating officer Upcoming milestones Andrew Obenshain, chief executive officer Q&A – joined by Chris Krawtschuk, chief financial officer Rich Colvin, chief medical officer


CONFIDENTIAL bluebird occupies a unique strategic position as a standalone gene therapy company 5 • 10+ years of gene therapy research • 180+ patients treated • 8 clinical trials • Established track record for LVV platform • 2 FDA approvals • 3rd BLA under priority review • 2 ongoing US launches • Transplant and cell therapy infrastructure • Proven reimbursementCl in ic al & p re -c lin ic al c om pa ni es Large cap pharm a Manufacturing experience R&D expertise Commercial infrastructure

CONFIDENTIAL bluebird’s five-year vision Multi billion-dollar opportunity with TDT and SCD in the US Competitive marginFocused, synergistic commercial footprint Wholly- owned global rights 6

CONFIDENTIAL Second Quarter 2023 Key Business Highlights 71. Cash balance contains $45m in restricted cash.; 2. Without the release of our restricted cash, we estimate our cash, cash equivalents and marketable securities as of June 30, 2023 will be sufficient to fund our operations into the second quarter of 2024. Cash Runway is calculated using the cash balance / net burn rate (cash from revenue less cash paid for expenses). Strong launch momentum demonstrating sustainable commercial potential across the platform ZYNTEGLO • 11 patient starts to date • Reimbursement secure with no ultimate denials across government and commercial payers • 15 QTCs activated; on track for 40-50 QTCs by the end of 2023 SKYSONA • 5 patient starts to date • Reimbursement secure with no ultimate denials across government and commercial payers • 4 QTCs activated lovo-cel for sickle cell disease granted FDA priority review • PDUFA date Dec. 20, 2023; commercial launch expected in early 2024, if approved • Cost-effective at up to $2.26 million (ICER) • Positive payer reception to clinical value and outcomes-based approach Disciplined and effective deployment of capital • $291 million in cash, cash equivalents, marketable securities and restricted cash as of June 30, 20231 • Reiterating 2023 cash burn guidance of $270 - $300 million • Cash runway into the fourth quarter of 20242 • $6.8 million in product revenue for the quarter

CONFIDENTIAL Launch momentum building as on-boarded QTCs gain experience and accelerate patient enrollment 2022 1H 2023 2023 2H 2023 WAVE 1 First 5 QTCs Activated 100% have started a patient 60% have started multiple patients August – Sept 2022 WAVE 2 6-10 QTCs Activated 40% have started a patient Patient enrollments ongoing October – December 2022 WAVE 3 ~11-20 QTCs Activation ongoing Patient identification in progress January - August 2023 Q TC s A ct iv at ed Ill us tr at ive ZYNTEGLO network is 100% synergistic with lovo-cel for SCD GOAL: 40-50 QTCs by end of 2023 MSA negotiations ongoing Through EOY 8

CONFIDENTIAL Delivering a consistent manufacturing process is essential for patients, families and providers 9 Apheresis and Cell Collection Drug Product Manufacturing and Testing Drug Product Ready to Ship Infusion and Recovery 70-90 Days Occurs at QTC Occurs at CMO Bulk of time spent on release testing to deliver high quality drug product ZYNTEGLO is indicated for the treatment of adult and pediatric patients with β-thalassemia who require regular red blood cell (RBC) transfusions. QTC: Qualified Treatment Center; CMO: Contract Manufacturing Organization Revenue recognized upon infusion ZYNTEGLO® manufacturing process

CONFIDENTIAL lovo-cel potential approval is based on the most robust and longest follow-up of any gene therapy program for SCD Data as of Aug 11, 2022 10*50 patients treated includes patients from HGB-205, HGB-206 Group A, Group B and Group C and HGB-210 BLA under priority review for the treatment for patients 12 and older with SCD with a history of VOEs PDUFA Date: December 20, 2023 BLA submission includes: • Efficacy data from 36 patients in HGB-206 Group C –Median 32 months of follow up • Safety data from 50 patients treated across entire lovo-cel program –Six patients with ≥ 6 years of follow up • August 2022 data cut demonstrating: – 97% complete resolution of severe VOEs through 24 mos – 90% resolution of VOEs through 24 mos – Maintenance of VOE resolution in majority of patients through long-term follow up + stable production of HbA – Majority of AEs attributed to underlying SCD or conditioning with busulfan

CONFIDENTIAL Durability and long-term follow-up are the most important factors driving gene therapy decisions and key differentiators for lovo-cel 11 …of patients would consider gene therapy if recommended by their doctor … of physicians are driven by efficacy and long-term follow-up, and not modality …projected market share for lovo-cel against direct competitors >70% >70% 50-65% 7+ years of market research consistently underscores lovo-cel as a meaningful treatment option for patients and significant opportunity for bluebird *Market research conducted by external sources in 2023; Data on file

CONFIDENTIALAugust 8, 2023 SKYSONA® for cerebral adrenoleukodystrophy Commercial • 40 potentially eligible patients; anticipate 5–10 patient starts in 2023 • 5 patient starts since launch; 4 QTCs activated; zero ultimate denials across government and commercial payers Clinical • 67 patients treated across all clinical trials • Accelerated approval based on post-hoc analysis of 11 patients; estimated 72% likelihood of major functional disability free survival at 24 months • Five boys treated in clinical trials developed myelodysplastic syndrome; label includes boxed warning* 12 SKYSONA is indicated to slow the progression of neurologic dysfunction in boys 4-17 years of age with early, active cerebral adrenoleukodystrophy (CALD) Patient starts is defined as a cell collection (apheresis); Activated QTC defined as Qualified Treatment Center with a signed MSA *bluebird closely monitors potential and diagnosed cases of hematologic malignancy in patients treated with SKYSONA and additional cases are expected to arise over time. bluebird is communicating regularly with treating physicians and regulatory authorities.

CONFIDENTIAL First to market gene therapy for inherited hemoglobin disorders in the U.S. Proving our commercial model Significant value driver o PDUFA date Dec. 20, 2023 o Commercial launch expected early 2024, if approved o Continued launch expansion through 2023 o 40-50 QTCs by end of 2023 o Anticipate 5-10 patient starts in 2023 o Continued launch expansion through 2023 SKYSONA® for cerebral adrenoleukodystrophy ZYNTEGLO® for beta-thalassemia lovo-cel for sickle cell disease Upcoming milestones 13

CONFIDENTIAL 14 Potential for significant value creation in the near-term Unique strategic position Strong competitive advantage Focus on profitability