Atara Biotherapeutics Transfers Full Manufacturing Responsibility For Tabelecleucel To Pierre Fabre; Now Entitled To Receive Up To $550M In Additional Potential Milestone Payments Upon Achieving Certain Regulatory And Commercial Milestones Relating To Tab-cel, Including Up To $40M In Potential Regulatory Milestones In Connection With The Approval By The FDA Of A BLA For Tab-cel

On March 31, 2025, Atara Biotherapeutics, Inc., (the "Company") entered into an Amendment (the "Amendment") to the Amended and Restated Commercialization Agreement dated October 31, 2023 (the "Agreement") with Pierre Fabre Medicament ("Pierre Fabre"). Under the terms of the Amendment, as of March 31, 2025, the Company has completed the transfer of all manufacturing responsibility to Pierre Fabre and Pierre Fabre will be, at its cost, responsible for manufacturing and supplying tabelecleucel for development and commercialization worldwide. Pierre Fabre has also agreed to assume the costs related to remediation of the third-party manufacturing facility to address the U.S. Food and Drug Administration's (the "FDA") requests to support resubmission of the BLA for tab-cel.

In exchange for accelerating the transfer of all manufacturing responsibility and assumption of such remediation costs by Pierre Fabre, among other things, the Company agreed to reduce the amount of certain potential future regulatory and commercial milestone payments under the Agreement. The Amendment did not change any of the royalties the Company is eligible to receive under the Agreement. Pursuant to the Amendment, the Company is now entitled to receive an aggregate of up to $550.0 million in additional potential milestone payments upon achieving certain regulatory and commercial milestones relating to tab-cel, including up to $40.0 million in potential regulatory milestones in connection with the approval by the FDA of a BLA for tab-cel under the terms of the Agreement (as amended by the Amendment).