2seventy bio, Inc. announced a definitive merger agreement under which Bristol Myers Squibb will acquire all of the outstanding shares of 2seventy bio at a price of $5.00 per share in an all-cash transaction for a total equity value of approximately $286 million, or $102 million net of estimated cash. The deal represents an 88% premium to the closing price of $2.66 on March 7, 2025.

“A year ago, 2seventy decided to exclusively focus on unlocking the value of Abecma, with the goal of delivering more time for people living with multiple myeloma and maximizing value for all stakeholders,” said Chip Baird, chief executive officer, 2seventy bio. “The strategic rationale for this acquisition is clear and today’s announcement represents the culmination of the journey for 2seventy bio. We believe that Abecma will continue to benefit from BMS’ experience and resources to ensure this important therapy is delivered to patients who need it. I would like to express my deep gratitude for current and past 2seventy team members and more broadly the dedicated community of patients, scientists, providers and partners that helped take cell and gene therapy from a complicated idea to reality for patients.”

Transaction Details and Path to Completion
Under the terms of the agreement, BMS will promptly commence a tender offer to acquire all outstanding shares of 2seventy bio at a price of $5.00 per share in an all-cash transaction. 2seventy bio’s Board of Directors unanimously recommends that 2seventy bio stockholders tender their shares in the tender offer.

The closing of the transaction is expected to occur in the second quarter of 2025 and is subject to customary closing conditions, including the tender of a majority of the outstanding shares of 2seventy bio’s common stock and the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. Following the successful closing of the tender offer, BMS will acquire all remaining shares of 2seventy bio common stock that are not tendered in the tender offer through a second-step merger at the same price in the tender offer of $5.00 per share.

Following the completion of this transaction, 2seventy bio’s common stock will no longer be listed for trading on Nasdaq.

In connection with the execution of the merger agreement, certain stockholders of 2seventy bio owning approximately 5.3% of the outstanding shares of 2seventy bio’s common stock have entered into tender and support agreements pursuant to which they have agreed to tender all of their owned shares in the offer.

Advisors
Goldman Sachs & Co. LLC is serving as exclusive financial advisor to 2seventy bio, and Goodwin Procter LLP is serving as legal counsel.

ABECMA U.S. INDICATION
ABECMA is a B-cell maturation antigen (BCMA)-directed genetically modified autologous T cell immunotherapy indicated for the treatment of adult patients with relapsed or refractory multiple myeloma after two or more prior lines of therapy including an immunomodulatory agent, a proteasome inhibitor, and an anti-CD38 monoclonal antibody.

U.S. Important Safety Information

BOXED WARNING: CYTOKINE RELEASE SYNDROME, NEUROLOGIC TOXICITIES, HLH/MAS, PROLONGED CYTOPENIA and SECONDARY HEMATOLOGICAL MALIGNANCIES

• Cytokine Release Syndrome (CRS), including fatal or life-threatening reactions, occurred in patients following treatment with ABECMA. Do not administer ABECMA to patients with active infection or inflammatory disorders. Treat severe or life-threatening CRS with tocilizumab or tocilizumab and corticosteroids.
• Neurologic Toxicities, which may be severe or life-threatening, occurred following treatment with ABECMA, including concurrently with CRS, after CRS resolution, or in the absence of CRS. Monitor for neurologic events after treatment with ABECMA. Provide supportive care and/or corticosteroids as needed.
• Hemophagocytic Lymphohistiocytosis/Macrophage Activation Syndrome (HLH/MAS) including fatal and life-threatening reactions, occurred in patients following treatment with ABECMA. HLH/MAS can occur with CRS or neurologic toxicities.
• Prolonged Cytopenia with bleeding and infection, including fatal outcomes following stem cell transplantation for hematopoietic recovery, occurred following treatment with ABECMA.
• T cell malignancies have occurred following treatment of hematologic malignancies with BCMA- and CD19-directed genetically modified autologous T cell immunotherapies, including ABECMA
• ABECMA is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the ABECMA REMS.