Initial Statement of Beneficial Ownership - Kevin G. Sarney

Kevin G. Sarney, the Interim CFO of Atara Biotherapeutics, Inc. (ATRA), has filed an Initial Statement of Beneficial Ownership (Form 3). The filing, dated June 26, 2026, indicates that Mr. Sarney directly owns no securities in the company. The document was signed on July 6, 2026.