Important Information for bluebird bio Stockholders to Tender Shares for Acquisition by Carlyle and SK Capital

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SOMERVILLE, Mass., May 09, 2025--(BUSINESS WIRE)--bluebird bio, Inc. (Nasdaq: BLUE) ("bluebird") today reminds all stockholders, including individual stockholders, to promptly tender their shares into the tender offer by Carlyle and SK Capital to purchase all outstanding shares of bluebird common stock by 11:59 p.m. Eastern on May 12, 2025.

Stockholders that hold shares of bluebird common stock through a broker or other nominee may be subject to a processing cutoff that is prior to the tender deadline, so it is important to act now.

Every share tendered by stockholders is important and it is important to tender now. If a majority of the outstanding shares of bluebird common stock are not tendered, the tender offer will not be completed, and bluebird will not be acquired, putting bluebird at significant risk of defaulting on its loan agreements with Hercules Capital and being forced into bankruptcy or liquidation. It is extremely unlikely that stockholders would receive any consideration for their shares in bankruptcy or liquidation.

Stockholders who need assistance tendering their shares of common stock of bluebird may contact the Information Agent, Innisfree M&A Incorporated, by calling toll-free at (877) 825-8793.

About bluebird bio

Founded in 2010, bluebird has been setting the standard for gene therapy for more than a decade—first as a scientific pioneer and now as a commercial leader. bluebird has an unrivaled track record in bringing the promise of gene therapy out of clinical studies and into the real-world setting, having secured FDA approvals for three therapies in under two years. Today, we are proving and scaling the commercial model for gene therapy and delivering innovative solutions for access to patients, providers, and payers.

With a dedicated focus on severe genetic diseases, bluebird has the largest and deepest ex-vivo gene therapy data set in the field, with industry-leading programs for sickle cell disease, ß-thalassemia, and cerebral adrenoleukodystrophy. We custom design each of our therapies to address the underlying cause of disease and have developed in-depth and effective analytical methods to understand the safety of our lentiviral vector technologies and drive the field of gene therapy forward.

bluebird continues to forge new paths as a standalone commercial gene therapy company, combining our real-world experience with a deep commitment to patient communities and a people-centric culture that attracts and grows a diverse flock of dedicated birds.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

This communication is not an offer to buy nor a solicitation of an offer to sell any securities of bluebird. The solicitation and the offer to buy shares of bluebird’s common stock is being made pursuant to a Tender Offer Statement on Schedule TO, including an offer to purchase, a letter of transmittal and other related materials, that were filed by Beacon Parent Holdings, L.P. ("Parent") and Beacon Merger Sub, Inc. ("Merger Sub") with the SEC on March 7, 2025. In addition, bluebird has filed a Solicitation/Recommendation Statement on Schedule 14D-9 with respect to the tender offer with the SEC on March 7, 2025. The tender offer materials and the Solicitation/Recommendation statement, as they may be amended from time to time, contain important information that should be read carefully when they become available and considered before any decision is made with respect to the tender offer. Investors will be able to obtain a free copy of these materials and other documents filed by Parent, Merger Sub and bluebird with the SEC at the website maintained by the SEC at www.sec.gov. Investors may also obtain, at no charge, copies of these materials and other documents by calling Innisfree M&A Incorporated, the information agent for the Offer, toll-free at (877) 825-8793 for stockholders or by calling collect at (212) 750-5833 for banks or brokers.