144 0001809916 XXXXXXXX LIVE 0001604464 Atara Biotherapeutics, Inc. 001-36548 c/o Atara Biotherapeutics, Inc. 2380 Conejo Spectrum St., Suite 200 Thousand Oaks CA 91320 805-623-4211 Murugan Amar Officer Common Stock Morgan Stanley Smith Barney LLC

Executive Services 200 W Civic Center Drive, 4th Floor Sandy UT 84070

10024 7725.5 101922250 03/04/2024 NASDAQ Common Stock 03/01/2024 Settlement of vested RSUs issued under an S-8 Registration Plan Issuer N 22231 03/01/2024 Equity compensation for services rendered Y Shares sold automatically to satisfy tax withholding obligations in connection with the vesting of previously granted restricted stock units, pursuant to a sale-to-cover provision in the award agreement. Exhibit List: Exhibit 24 - Power of Attorney. 03/04/2024 /s/ Jeff Kiekhofer, Attorney-in-Fact for Amar Murugan poa_murugan.htm EX-24 poa_murugan 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