Company: ATRA
Filing Date: 2025-09-04
Form Type: 8-K
Source: 0000950170-25-112898
Chunk: 0

Company: Atara Biotherapeutics, Inc.
Filing Date: 2025-09-04
Form: 8-K
Item: Item 5.02
Chunk 0
---
Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b) Following an assessment by the Board of Directors (the “ Board”) of Atara Biotherapeutics, Inc., a Delaware corporation (the “ Company”), of its size and composition, the Board determined that a reduction in the number of directors would help right-size the Board to reflect the Company's current operations and further align the size of the Company’s Board with the boards of public companies of similar size. As a result of such determination, on September 2, 2025, each of Ameet Mallik, Pascal Touchon, and Maria Grazia Roncarolo, M. D., notified the Board that they will each voluntarily resign from the Board effective as of September 2, 2025 (the “ Resignation Effective Date”). In connection with such resignations, the Board reduced its size from ten (10) to seven (7) directors, as of the Resignation Effective Date.

In connection with the resignation of Pascal Touchon, who served as Chair of the Board, the Board appointed Gregory A. Ciongoli to serve as Chair of the Board.

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.

                                             ATARA BIOTHERAPEUTICS, INC.  
  Date:      September 3, 2025      By:      /s/ Yanina Grant-Huerta      
                                             Yanina Grant-Huerta