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  <issuerName>Atara Biotherapeutics, Inc.</issuerName>
  <secFileNumber>001-36548</secFileNumber>
  <issuerAddress>
  <com:street1>c/o Atara Biotherapeutics, Inc.</com:street1>
  <com:street2>2380 Conejo Spectrum St., Suite 200</com:street2>
  <com:city>Thousand Oaks</com:city>
  <com:stateOrCountry>CA</com:stateOrCountry>
  <com:zipCode>91320</com:zipCode>
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  <issuerContactPhone>805-623-4211</issuerContactPhone>
  <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Henrich Jill</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
  <relationshipsToIssuer>
  <relationshipToIssuer>Officer</relationshipToIssuer>
  </relationshipsToIssuer>
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  <securitiesInformation>
  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <brokerOrMarketmakerDetails>
  <name>Morgan Stanley Smith Barney LLC</name>
  <address>
  <com:street1>Executive Services</com:street1>
  <com:street2>200 W Civic Center Drive, 4th Floor</com:street2>
  <com:city>Sandy</com:city>
  <com:stateOrCountry>UT</com:stateOrCountry>
  <com:zipCode>84070</com:zipCode>
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  <noOfUnitsSold>1112</noOfUnitsSold>
  <aggregateMarketValue>13344</aggregateMarketValue>
  <noOfUnitsOutstanding>5759750</noOfUnitsOutstanding>
  <approxSaleDate>11/18/2024</approxSaleDate>
  <securitiesExchangeName>NASDAQ</securitiesExchangeName>
  </securitiesInformation>
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  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <acquiredDate>11/15/2024</acquiredDate>
  <natureOfAcquisitionTransaction>Settlement of vested RSUs issued under an S-8 Registration Plan</natureOfAcquisitionTransaction>
  <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
  <isGiftTransaction>N</isGiftTransaction>
  <amountOfSecuritiesAcquired>2592</amountOfSecuritiesAcquired>
  <paymentDate>11/15/2024</paymentDate>
  <natureOfPayment>Equity compensation for services rendered</natureOfPayment>
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  <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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  <name>Jill Henrich</name>
  <address>
  <com:street1>2380 Conejo Spectrum St</com:street1>
  <com:street2>Suite 200</com:street2>
  <com:city>Thousand Oaks</com:city>
  <com:stateOrCountry>CA</com:stateOrCountry>
  <com:zipCode>91320</com:zipCode>
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  <securitiesClassTitle>Common Stock</securitiesClassTitle>
  <saleDate>08/16/2024</saleDate>
  <amountOfSecuritiesSold>963</amountOfSecuritiesSold>
  <grossProceeds>6383.99</grossProceeds>
  </securitiesSoldInPast3Months>
  <remarks>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.</remarks>
  <noticeSignature>
  <noticeDate>11/18/2024</noticeDate>
  <signature>/s/ Jeff Kiekhofer, Attorney-in-Fact for Jill Henrich</signature>
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text: 144
  0001978096
  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
  Henrich Jill
  Officer
  Common Stock
  Morgan Stanley Smith Barney LLC
  Executive Services
  200 W Civic Center Drive, 4th Floor
  Sandy
  UT
  84070
  1112
  13344
  5759750
  11/18/2024
  NASDAQ
  Common Stock
  11/15/2024
  Settlement of vested RSUs issued under an S-8 Registration Plan
  Issuer
  N
  2592
  11/15/2024
  Equity compensation for services rendered
  N
  Jill Henrich
  2380 Conejo Spectrum St
  Suite 200
  Thousand Oaks
  CA
  91320
  Common Stock
  08/16/2024
  963
  6383.99
  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.
  11/18/2024
  /s/ Jeff Kiekhofer, Attorney-in-Fact for Jill Henrich