{"transactions":[{"id":3506423,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-31T16:16:00.000Z","date":"2019-05-30","kind":"sale","acquired":false,"shares":1500,"price":23.7,"value":35550.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $23.54 to $23.80. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":290687,"source":{"system":"sec-edgar","filing":"0001209191-19-033638","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119033638/doc4.xml","form_type":"4"}},{"id":3506422,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-31T16:16:00.000Z","date":"2019-05-30","kind":"sale","acquired":false,"shares":1425,"price":22.72,"value":32376.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $22.48 to $23.365. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":292187,"source":{"system":"sec-edgar","filing":"0001209191-19-033638","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119033638/doc4.xml","form_type":"4"}},{"id":3506421,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-31T16:16:00.000Z","date":"2019-05-29","kind":"sale","acquired":false,"shares":725,"price":23.3,"value":16892.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $23.23 to $23.335. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":293612,"source":{"system":"sec-edgar","filing":"0001209191-19-033638","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119033638/doc4.xml","form_type":"4"}},{"id":3506420,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-31T16:16:00.000Z","date":"2019-05-29","kind":"sale","acquired":false,"shares":2200,"price":22.85,"value":50270.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $22.21 to $23.19. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":294337,"source":{"system":"sec-edgar","filing":"0001209191-19-033638","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119033638/doc4.xml","form_type":"4"}},{"id":3526085,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-15T16:35:38.000Z","date":"2019-05-14","kind":"sale","acquired":false,"shares":3900,"price":24.92,"value":97188.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $24.51 to $25.08. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":296537,"source":{"system":"sec-edgar","filing":"0001209191-19-030024","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119030024/doc4.xml","form_type":"4"}},{"id":3526084,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-15T16:35:38.000Z","date":"2019-05-13","kind":"sale","acquired":false,"shares":400,"price":24.95,"value":9980.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $24.91 to $25.05. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":300437,"source":{"system":"sec-edgar","filing":"0001209191-19-030024","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119030024/doc4.xml","form_type":"4"}},{"id":3526083,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-05-15T16:35:38.000Z","date":"2019-05-13","kind":"sale","acquired":false,"shares":3500,"price":24.23,"value":84805.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $23.75 to $24.62. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":300837,"source":{"system":"sec-edgar","filing":"0001209191-19-030024","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119030024/doc4.xml","form_type":"4"}},{"id":3546639,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-29T17:36:33.000Z","date":"2019-04-26","kind":"sale","acquired":false,"shares":3900,"price":33.47,"value":130533.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.11 to $33.935. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":304337,"source":{"system":"sec-edgar","filing":"0001209191-19-026446","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119026446/doc4.xml","form_type":"4"}},{"id":3546638,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-29T17:36:33.000Z","date":"2019-04-25","kind":"sale","acquired":false,"shares":300,"price":33.99,"value":10197.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.98 to $34.01. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":308237,"source":{"system":"sec-edgar","filing":"0001209191-19-026446","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119026446/doc4.xml","form_type":"4"}},{"id":3546637,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-29T17:36:33.000Z","date":"2019-04-25","kind":"sale","acquired":false,"shares":3600,"price":33.57,"value":120852.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $32.97 to $33.865. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":308537,"source":{"system":"sec-edgar","filing":"0001209191-19-026446","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119026446/doc4.xml","form_type":"4"}},{"id":3556640,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-12T16:19:07.000Z","date":"2019-04-11","kind":"sale","acquired":false,"shares":3900,"price":36.27,"value":141453.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.00 to $36.64. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":312137,"source":{"system":"sec-edgar","filing":"0001209191-19-024482","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119024482/doc4.xml","form_type":"4"}},{"id":3556639,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-12T16:19:07.000Z","date":"2019-04-10","kind":"sale","acquired":false,"shares":3900,"price":37.04,"value":144456.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.74 to $37.48. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":316037,"source":{"system":"sec-edgar","filing":"0001209191-19-024482","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119024482/doc4.xml","form_type":"4"}},{"id":3572011,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-01T16:16:48.000Z","date":"2019-03-29","kind":"sale","acquired":false,"shares":200,"price":41.7,"value":8340.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $41.695 to $41.71. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":319937,"source":{"system":"sec-edgar","filing":"0001209191-19-021972","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119021972/doc4.xml","form_type":"4"}},{"id":3572010,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-01T16:16:48.000Z","date":"2019-03-29","kind":"sale","acquired":false,"shares":3700,"price":39.81,"value":147297.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.50 to $40.375. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":320137,"source":{"system":"sec-edgar","filing":"0001209191-19-021972","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119021972/doc4.xml","form_type":"4"}},{"id":3572009,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-01T16:16:48.000Z","date":"2019-03-28","kind":"sale","acquired":false,"shares":300,"price":38.59,"value":11577.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.53 to $38.63. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":323837,"source":{"system":"sec-edgar","filing":"0001209191-19-021972","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119021972/doc4.xml","form_type":"4"}},{"id":3572008,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-01T16:16:48.000Z","date":"2019-03-28","kind":"sale","acquired":false,"shares":1600,"price":38.02,"value":60832.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $37.50 to $38.35. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":324137,"source":{"system":"sec-edgar","filing":"0001209191-19-021972","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119021972/doc4.xml","form_type":"4"}},{"id":3572007,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-04-01T16:16:48.000Z","date":"2019-03-28","kind":"sale","acquired":false,"shares":2000,"price":36.75,"value":73500.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.30 to $37.10. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":325737,"source":{"system":"sec-edgar","filing":"0001209191-19-021972","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119021972/doc4.xml","form_type":"4"}},{"id":3590574,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-18T16:13:25.000Z","date":"2019-03-15","kind":"sale","acquired":false,"shares":3900,"price":38.73,"value":151047.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.15 to $39.14. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":327737,"source":{"system":"sec-edgar","filing":"0001209191-19-019979","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119019979/doc4.xml","form_type":"4"}},{"id":3590573,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-18T16:13:25.000Z","date":"2019-03-14","kind":"sale","acquired":false,"shares":3200,"price":40.48,"value":129536.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.02 to $40.89. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":331637,"source":{"system":"sec-edgar","filing":"0001209191-19-019979","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119019979/doc4.xml","form_type":"4"}},{"id":3590572,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-18T16:13:25.000Z","date":"2019-03-14","kind":"sale","acquired":false,"shares":700,"price":39.1,"value":27370.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.92 to $39.39. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":334837,"source":{"system":"sec-edgar","filing":"0001209191-19-019979","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119019979/doc4.xml","form_type":"4"}},{"id":3623193,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-01T16:10:49.000Z","date":"2019-02-28","kind":"sale","acquired":false,"shares":3900,"price":36.13,"value":140907.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.80 to $36.71. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":335537,"source":{"system":"sec-edgar","filing":"0001209191-19-014944","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119014944/doc4.xml","form_type":"4"}},{"id":3623192,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-01T16:10:49.000Z","date":"2019-02-27","kind":"sale","acquired":false,"shares":3700,"price":36.2,"value":133940.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.98 to $36.46. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":339437,"source":{"system":"sec-edgar","filing":"0001209191-19-014944","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119014944/doc4.xml","form_type":"4"}},{"id":3623191,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-03-01T16:10:49.000Z","date":"2019-02-27","kind":"sale","acquired":false,"shares":200,"price":35.22,"value":7044.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.87 to $35.56. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":343137,"source":{"system":"sec-edgar","filing":"0001209191-19-014944","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119014944/doc4.xml","form_type":"4"}},{"id":3649944,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-19T17:06:02.000Z","date":"2019-02-15","kind":"tax_withholding","acquired":false,"shares":1176,"price":40.45,"value":47569.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld to cover tax obligation from settlement of vested restricted stock units."}],"balance_after":332243,"source":{"system":"sec-edgar","filing":"0001209191-19-011179","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119011179/doc4.xml","form_type":"4"}},{"id":3663102,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-12T19:18:27.000Z","date":"2019-02-12","kind":"sale","acquired":false,"shares":3900,"price":39.01,"value":152139.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.75 to $39.24. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":342138,"source":{"system":"sec-edgar","filing":"0001209191-19-009508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119009508/doc4.xml","form_type":"4"}},{"id":3663101,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-12T19:18:27.000Z","date":"2019-02-11","kind":"sale","acquired":false,"shares":3900,"price":38.52,"value":150228.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.12 to $39.07. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":346038,"source":{"system":"sec-edgar","filing":"0001209191-19-009508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119009508/doc4.xml","form_type":"4"}},{"id":3663100,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-12T19:18:27.000Z","date":"2019-02-09","kind":"tax_withholding","acquired":false,"shares":20324,"price":38.49,"value":782270.76,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld to cover tax obligation from settlement of vested restricted stock units."}],"balance_after":334618,"source":{"system":"sec-edgar","filing":"0001209191-19-009508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119009508/doc4.xml","form_type":"4"}},{"id":3663103,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-12T19:17:52.000Z","date":"2019-02-06","kind":"tax_withholding","acquired":false,"shares":24683,"price":38.47,"value":949555.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld to cover tax obligation from settlement of vested restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Filed solely to state the price which was inadvertently omitted."}],"balance_after":375611,"source":{"system":"sec-edgar","filing":"0001209191-19-009507","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119009507/doc4a.xml","form_type":"4/A","original_submission_date":"2019-02-08"}},{"id":3668137,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-02-08T16:27:25.000Z","date":"2019-02-06","kind":"tax_withholding","acquired":false,"shares":24683,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to cover tax obligation from settlement of vested restricted stock units."}],"balance_after":375611,"source":{"system":"sec-edgar","filing":"0001209191-19-008521","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119008521/doc4.xml","form_type":"4"}},{"id":3686788,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-25T20:16:56.000Z","date":"2019-01-24","kind":"sale","acquired":false,"shares":430,"price":35.82,"value":15402.6,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.635 to $36.07. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. 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The prices actually received ranged from $34.50 to $35.49. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. 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Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":300352,"source":{"system":"sec-edgar","filing":"0001209191-19-005448","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119005448/doc4.xml","form_type":"4"}},{"id":3686785,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-25T20:16:56.000Z","date":"2019-01-23","kind":"sale","acquired":false,"shares":800,"price":35.59,"value":28472.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.40 to $36.40. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":300452,"source":{"system":"sec-edgar","filing":"0001209191-19-005448","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119005448/doc4.xml","form_type":"4"}},{"id":3686784,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-25T20:16:56.000Z","date":"2019-01-23","kind":"sale","acquired":false,"shares":3000,"price":34.84,"value":104520.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.35 to $35.12. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":301252,"source":{"system":"sec-edgar","filing":"0001209191-19-005448","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119005448/doc4.xml","form_type":"4"}},{"id":3698174,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-10T18:08:04.000Z","date":"2019-01-10","kind":"sale","acquired":false,"shares":2200,"price":34.5,"value":75900.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.38 to $34.68. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":4078,"source":{"system":"sec-edgar","filing":"0001209191-19-003315","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119003315/doc4.xml","form_type":"4"}},{"id":3698173,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-10T18:08:04.000Z","date":"2019-01-10","kind":"sale","acquired":false,"shares":1700,"price":33.93,"value":57681.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.36 to $34.36. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":6278,"source":{"system":"sec-edgar","filing":"0001209191-19-003315","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119003315/doc4.xml","form_type":"4"}},{"id":3698172,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-10T18:08:04.000Z","date":"2019-01-09","kind":"sale","acquired":false,"shares":2000,"price":35.16,"value":70320.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.99 to $35.43. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":7978,"source":{"system":"sec-edgar","filing":"0001209191-19-003315","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119003315/doc4.xml","form_type":"4"}},{"id":3698171,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2019-01-10T18:08:04.000Z","date":"2019-01-09","kind":"sale","acquired":false,"shares":1900,"price":34.51,"value":65569.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.97 to $34.905. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":9978,"source":{"system":"sec-edgar","filing":"0001209191-19-003315","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919119003315/doc4.xml","form_type":"4"}},{"id":3716885,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-28T18:51:28.000Z","date":"2018-12-28","kind":"sale","acquired":false,"shares":500,"price":35.4,"value":17700.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.14 to $35.60. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":11878,"source":{"system":"sec-edgar","filing":"0001209191-18-064352","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118064352/doc4.xml","form_type":"4"}},{"id":3716884,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-28T18:51:28.000Z","date":"2018-12-28","kind":"sale","acquired":false,"shares":3400,"price":34.6,"value":117640.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.13 to $35.12. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":12378,"source":{"system":"sec-edgar","filing":"0001209191-18-064352","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118064352/doc4.xml","form_type":"4"}},{"id":3716883,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-28T18:51:28.000Z","date":"2018-12-27","kind":"sale","acquired":false,"shares":653,"price":34.19,"value":22326.07,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.05 to $34.27. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":15778,"source":{"system":"sec-edgar","filing":"0001209191-18-064352","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118064352/doc4.xml","form_type":"4"}},{"id":3716882,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-28T18:51:28.000Z","date":"2018-12-27","kind":"sale","acquired":false,"shares":3247,"price":32.82,"value":106566.54,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $32.48 to $33.45. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":16431,"source":{"system":"sec-edgar","filing":"0001209191-18-064352","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118064352/doc4.xml","form_type":"4"}},{"id":3732172,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-13T18:58:16.000Z","date":"2018-12-13","kind":"sale","acquired":false,"shares":3900,"price":42.75,"value":166725.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $42.48 to $42.96. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":19678,"source":{"system":"sec-edgar","filing":"0001209191-18-062527","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118062527/doc4.xml","form_type":"4"}},{"id":3732171,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-12-13T18:58:16.000Z","date":"2018-12-12","kind":"sale","acquired":false,"shares":3900,"price":42.56,"value":165984.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $42.17 to $43.16. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":23578,"source":{"system":"sec-edgar","filing":"0001209191-18-062527","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118062527/doc4.xml","form_type":"4"}},{"id":3748878,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-29T19:39:09.000Z","date":"2018-11-29","kind":"sale","acquired":false,"shares":2500,"price":42.26,"value":105650.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $41.68 to $42.65. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":27478,"source":{"system":"sec-edgar","filing":"0001209191-18-060311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118060311/doc4.xml","form_type":"4"}},{"id":3748877,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-29T19:39:09.000Z","date":"2018-11-29","kind":"sale","acquired":false,"shares":1400,"price":41.13,"value":57582.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.65 to $41.63. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":29978,"source":{"system":"sec-edgar","filing":"0001209191-18-060311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118060311/doc4.xml","form_type":"4"}},{"id":3748876,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-29T19:39:09.000Z","date":"2018-11-28","kind":"sale","acquired":false,"shares":1200,"price":39.54,"value":47448.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.15 to $39.705. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":31378,"source":{"system":"sec-edgar","filing":"0001209191-18-060311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118060311/doc4.xml","form_type":"4"}},{"id":3748875,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-29T19:39:09.000Z","date":"2018-11-28","kind":"sale","acquired":false,"shares":2700,"price":38.65,"value":104355.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.14 to $39.10. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":32578,"source":{"system":"sec-edgar","filing":"0001209191-18-060311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118060311/doc4.xml","form_type":"4"}},{"id":3763220,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-15T19:06:49.000Z","date":"2018-11-15","kind":"sale","acquired":false,"shares":2800,"price":35.49,"value":99372.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.11 to $35.89. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":35278,"source":{"system":"sec-edgar","filing":"0001209191-18-058820","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118058820/doc4.xml","form_type":"4"}},{"id":3763219,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-15T19:06:49.000Z","date":"2018-11-15","kind":"sale","acquired":false,"shares":1100,"price":34.67,"value":38137.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.07 to $35.07. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":38078,"source":{"system":"sec-edgar","filing":"0001209191-18-058820","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118058820/doc4.xml","form_type":"4"}},{"id":3763218,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-15T19:06:49.000Z","date":"2018-11-14","kind":"sale","acquired":false,"shares":600,"price":34.51,"value":20706.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.25 to $34.61. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":39178,"source":{"system":"sec-edgar","filing":"0001209191-18-058820","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118058820/doc4.xml","form_type":"4"}},{"id":3763217,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-11-15T19:06:49.000Z","date":"2018-11-14","kind":"sale","acquired":false,"shares":3300,"price":33.89,"value":111837.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.18 to $34.16. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":39778,"source":{"system":"sec-edgar","filing":"0001209191-18-058820","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118058820/doc4.xml","form_type":"4"}},{"id":3784890,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-23T18:10:07.000Z","date":"2018-10-23","kind":"sale","acquired":false,"shares":800,"price":35.18,"value":28144.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.92 to $35.43. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":43078,"source":{"system":"sec-edgar","filing":"0001209191-18-055990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118055990/doc4.xml","form_type":"4"}},{"id":3784889,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-23T18:10:07.000Z","date":"2018-10-23","kind":"sale","acquired":false,"shares":1700,"price":34.39,"value":58463.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.77 to $34.68. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":43878,"source":{"system":"sec-edgar","filing":"0001209191-18-055990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118055990/doc4.xml","form_type":"4"}},{"id":3784888,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-23T18:10:07.000Z","date":"2018-10-23","kind":"sale","acquired":false,"shares":1400,"price":33.17,"value":46438.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $32.75 to $33.44. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":45578,"source":{"system":"sec-edgar","filing":"0001209191-18-055990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118055990/doc4.xml","form_type":"4"}},{"id":3784887,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-23T18:10:07.000Z","date":"2018-10-22","kind":"sale","acquired":false,"shares":795,"price":34.26,"value":27236.7,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $34.11 to $34.47. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":46978,"source":{"system":"sec-edgar","filing":"0001209191-18-055990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118055990/doc4.xml","form_type":"4"}},{"id":3784886,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-23T18:10:07.000Z","date":"2018-10-22","kind":"sale","acquired":false,"shares":3105,"price":33.66,"value":104514.3,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $33.09 to $34.06. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":47773,"source":{"system":"sec-edgar","filing":"0001209191-18-055990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118055990/doc4.xml","form_type":"4"}},{"id":3795996,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-05T19:45:05.000Z","date":"2018-10-05","kind":"sale","acquired":false,"shares":100,"price":41,"value":4100.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":50878,"source":{"system":"sec-edgar","filing":"0001209191-18-054455","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118054455/doc4.xml","form_type":"4"}},{"id":3795995,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-05T19:45:05.000Z","date":"2018-10-05","kind":"sale","acquired":false,"shares":1900,"price":40.25,"value":76475.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.88 to $40.51. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":50978,"source":{"system":"sec-edgar","filing":"0001209191-18-054455","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118054455/doc4.xml","form_type":"4"}},{"id":3795994,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-05T19:45:05.000Z","date":"2018-10-05","kind":"sale","acquired":false,"shares":1900,"price":39.58,"value":75202.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.84 to $39.84. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":52878,"source":{"system":"sec-edgar","filing":"0001209191-18-054455","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118054455/doc4.xml","form_type":"4"}},{"id":3795993,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-05T19:45:05.000Z","date":"2018-10-04","kind":"sale","acquired":false,"shares":1300,"price":41.34,"value":53742.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $41.00 to $41.65. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":54778,"source":{"system":"sec-edgar","filing":"0001209191-18-054455","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118054455/doc4.xml","form_type":"4"}},{"id":3795992,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-10-05T19:45:05.000Z","date":"2018-10-04","kind":"sale","acquired":false,"shares":2600,"price":40.09,"value":104234.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.50 to $40.50. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":56078,"source":{"system":"sec-edgar","filing":"0001209191-18-054455","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118054455/doc4.xml","form_type":"4"}},{"id":3808321,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-25T16:17:35.000Z","date":"2018-09-22","kind":"tax_withholding","acquired":false,"shares":79328,"price":39.85,"value":3161220.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to cover tax obligation from settlement of vested restricted stock units."}],"balance_after":733285,"source":{"system":"sec-edgar","filing":"0001209191-18-052146","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118052146/doc4.xml","form_type":"4"}},{"id":3810696,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-20T16:26:06.000Z","date":"2018-09-19","kind":"sale","acquired":false,"shares":3900,"price":39.99,"value":155961.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.675 to $40.55. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":58678,"source":{"system":"sec-edgar","filing":"0001209191-18-051790","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118051790/doc4.xml","form_type":"4"}},{"id":3810695,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-20T16:26:06.000Z","date":"2018-09-18","kind":"sale","acquired":false,"shares":3900,"price":39.62,"value":154518.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.25 to $40.125. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":62578,"source":{"system":"sec-edgar","filing":"0001209191-18-051790","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118051790/doc4.xml","form_type":"4"}},{"id":3820557,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-10T16:19:42.000Z","date":"2018-09-07","kind":"sale","acquired":false,"shares":1827,"price":40.23,"value":73500.21,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.15 to $40.40. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":66478,"source":{"system":"sec-edgar","filing":"0001209191-18-050256","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118050256/doc4.xml","form_type":"4"}},{"id":3820556,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-10T16:19:42.000Z","date":"2018-09-07","kind":"sale","acquired":false,"shares":2073,"price":39.74,"value":82381.02,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.10 to $40.10. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":68305,"source":{"system":"sec-edgar","filing":"0001209191-18-050256","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118050256/doc4.xml","form_type":"4"}},{"id":3820555,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-10T16:19:42.000Z","date":"2018-09-06","kind":"sale","acquired":false,"shares":1120,"price":39.42,"value":44150.4,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.25 to $39.90. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":70378,"source":{"system":"sec-edgar","filing":"0001209191-18-050256","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118050256/doc4.xml","form_type":"4"}},{"id":3820554,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-09-10T16:19:42.000Z","date":"2018-09-06","kind":"sale","acquired":false,"shares":2780,"price":38.45,"value":106891.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.05 to $39.00. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":71498,"source":{"system":"sec-edgar","filing":"0001209191-18-050256","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118050256/doc4.xml","form_type":"4"}},{"id":3835967,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-08-22T16:19:02.000Z","date":"2018-08-21","kind":"sale","acquired":false,"shares":3900,"price":36.69,"value":143091.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.35 to $37. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":74278,"source":{"system":"sec-edgar","filing":"0001209191-18-047937","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118047937/doc4.xml","form_type":"4"}},{"id":3835966,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-08-22T16:19:02.000Z","date":"2018-08-20","kind":"sale","acquired":false,"shares":3900,"price":36.04,"value":140556.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $35.60 to $36.45. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":78178,"source":{"system":"sec-edgar","filing":"0001209191-18-047937","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118047937/doc4.xml","form_type":"4"}},{"id":3850838,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-08-07T17:56:27.000Z","date":"2018-08-07","kind":"sale","acquired":false,"shares":300,"price":37.75,"value":11325.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":82078,"source":{"system":"sec-edgar","filing":"0001209191-18-045749","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118045749/doc4.xml","form_type":"4"}},{"id":3850837,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-08-07T17:56:27.000Z","date":"2018-08-07","kind":"sale","acquired":false,"shares":3600,"price":37.35,"value":134460.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.70 to $37.70. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":82378,"source":{"system":"sec-edgar","filing":"0001209191-18-045749","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118045749/doc4.xml","form_type":"4"}},{"id":3850836,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-08-07T17:56:27.000Z","date":"2018-08-06","kind":"sale","acquired":false,"shares":3900,"price":37.48,"value":146172.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.90 to $37.85. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":85978,"source":{"system":"sec-edgar","filing":"0001209191-18-045749","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118045749/doc4.xml","form_type":"4"}},{"id":3859079,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-30T16:43:08.000Z","date":"2018-07-27","kind":"sale","acquired":false,"shares":1700,"price":37.53,"value":63801.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $37.20 to $37.95. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":89878,"source":{"system":"sec-edgar","filing":"0001209191-18-044412","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118044412/doc4.xml","form_type":"4"}},{"id":3859078,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-30T16:43:08.000Z","date":"2018-07-27","kind":"sale","acquired":false,"shares":2200,"price":36.55,"value":80410.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $36.00 to $36.825. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":91578,"source":{"system":"sec-edgar","filing":"0001209191-18-044412","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118044412/doc4.xml","form_type":"4"}},{"id":3859077,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-30T16:43:08.000Z","date":"2018-07-26","kind":"sale","acquired":false,"shares":100,"price":39.45,"value":3945.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":93778,"source":{"system":"sec-edgar","filing":"0001209191-18-044412","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118044412/doc4.xml","form_type":"4"}},{"id":3859076,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-30T16:43:08.000Z","date":"2018-07-26","kind":"sale","acquired":false,"shares":3800,"price":39.02,"value":148276.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.40 to $39.35. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":93878,"source":{"system":"sec-edgar","filing":"0001209191-18-044412","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118044412/doc4.xml","form_type":"4"}},{"id":3869327,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-11T16:09:49.000Z","date":"2018-07-10","kind":"sale","acquired":false,"shares":6100,"price":40.54,"value":247294.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.325 to $41.15. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":97678,"source":{"system":"sec-edgar","filing":"0001209191-18-042311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118042311/doc4.xml","form_type":"4"}},{"id":3869326,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-11T16:09:49.000Z","date":"2018-07-10","kind":"sale","acquired":false,"shares":22300,"price":39.93,"value":890439.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.30 to $40.30. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":103778,"source":{"system":"sec-edgar","filing":"0001209191-18-042311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118042311/doc4.xml","form_type":"4"}},{"id":3869325,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-11T16:09:49.000Z","date":"2018-07-09","kind":"sale","acquired":false,"shares":2141,"price":40.63,"value":86988.83,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.475 to $41.20. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":126078,"source":{"system":"sec-edgar","filing":"0001209191-18-042311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118042311/doc4.xml","form_type":"4"}},{"id":3869324,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-07-11T16:09:49.000Z","date":"2018-07-09","kind":"sale","acquired":false,"shares":27859,"price":39.88,"value":1111016.92,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted January 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.45 to $40.45. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":128219,"source":{"system":"sec-edgar","filing":"0001209191-18-042311","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118042311/doc4.xml","form_type":"4"}},{"id":3882289,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-27T19:15:39.000Z","date":"2018-06-27","kind":"sale","acquired":false,"shares":500,"price":39.4,"value":19700.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.80 to $39.55. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":156078,"source":{"system":"sec-edgar","filing":"0001209191-18-039715","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118039715/doc4.xml","form_type":"4"}},{"id":3882288,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-27T19:15:39.000Z","date":"2018-06-27","kind":"sale","acquired":false,"shares":1500,"price":37.57,"value":56355.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $37.05 to $38.05. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":156578,"source":{"system":"sec-edgar","filing":"0001209191-18-039715","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118039715/doc4.xml","form_type":"4"}},{"id":3882287,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-27T19:15:39.000Z","date":"2018-06-26","kind":"sale","acquired":false,"shares":1700,"price":40.79,"value":69343.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.65 to $40.90. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":158078,"source":{"system":"sec-edgar","filing":"0001209191-18-039715","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118039715/doc4.xml","form_type":"4"}},{"id":3882286,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-27T19:15:39.000Z","date":"2018-06-26","kind":"sale","acquired":false,"shares":2700,"price":40.01,"value":108027.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.50 to $40.40. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":159778,"source":{"system":"sec-edgar","filing":"0001209191-18-039715","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118039715/doc4.xml","form_type":"4"}},{"id":3903449,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-06T19:18:35.000Z","date":"2018-06-06","kind":"sale","acquired":false,"shares":1000,"price":48.59,"value":48590.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $48.30 to $48.875. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":162478,"source":{"system":"sec-edgar","filing":"0001209191-18-036168","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118036168/doc4.xml","form_type":"4"}},{"id":3903448,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-06T19:18:35.000Z","date":"2018-06-06","kind":"sale","acquired":false,"shares":1500,"price":47.69,"value":71535.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $47.20 to $48.20. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":163478,"source":{"system":"sec-edgar","filing":"0001209191-18-036168","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118036168/doc4.xml","form_type":"4"}},{"id":3903447,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-06T19:18:35.000Z","date":"2018-06-06","kind":"sale","acquired":false,"shares":1900,"price":46.53,"value":88407.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $46.15 to $47.075. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":164978,"source":{"system":"sec-edgar","filing":"0001209191-18-036168","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118036168/doc4.xml","form_type":"4"}},{"id":3903446,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-06T19:18:35.000Z","date":"2018-06-05","kind":"sale","acquired":false,"shares":1200,"price":50.27,"value":60324.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $50.05 to $50.55. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":166878,"source":{"system":"sec-edgar","filing":"0001209191-18-036168","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118036168/doc4.xml","form_type":"4"}},{"id":3903445,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-06-06T19:18:35.000Z","date":"2018-06-05","kind":"sale","acquired":false,"shares":3200,"price":49.51,"value":158432.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $49.00 to $50.00. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":168078,"source":{"system":"sec-edgar","filing":"0001209191-18-036168","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118036168/doc4.xml","form_type":"4"}},{"id":3922076,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-22T19:02:27.000Z","date":"2018-05-22","kind":"sale","acquired":false,"shares":4400,"price":50.88,"value":223872.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $50.35 to $51.25. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":171278,"source":{"system":"sec-edgar","filing":"0001209191-18-032447","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118032447/doc4.xml","form_type":"4"}},{"id":3922075,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-22T19:02:27.000Z","date":"2018-05-21","kind":"sale","acquired":false,"shares":900,"price":53.64,"value":48276.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $53.45 to $53.825. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":175678,"source":{"system":"sec-edgar","filing":"0001209191-18-032447","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118032447/doc4.xml","form_type":"4"}},{"id":3922074,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-22T19:02:27.000Z","date":"2018-05-21","kind":"sale","acquired":false,"shares":2000,"price":52.83,"value":105660.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $52.40 to $53.40. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":176578,"source":{"system":"sec-edgar","filing":"0001209191-18-032447","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118032447/doc4.xml","form_type":"4"}},{"id":3922073,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-22T19:02:27.000Z","date":"2018-05-21","kind":"sale","acquired":false,"shares":1500,"price":51.67,"value":77505.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $51.35 to $52.15. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":178578,"source":{"system":"sec-edgar","filing":"0001209191-18-032447","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118032447/doc4.xml","form_type":"4"}},{"id":3939007,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-10T19:46:16.000Z","date":"2018-05-10","kind":"sale","acquired":false,"shares":2200,"price":40.98,"value":90156.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $40.75 to $41.20. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":180078,"source":{"system":"sec-edgar","filing":"0001209191-18-029380","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118029380/doc4.xml","form_type":"4"}},{"id":3939006,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-10T19:46:16.000Z","date":"2018-05-10","kind":"sale","acquired":false,"shares":2200,"price":40.08,"value":88176.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.70 to $40.65. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":182278,"source":{"system":"sec-edgar","filing":"0001209191-18-029380","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118029380/doc4.xml","form_type":"4"}},{"id":3939005,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-10T19:46:16.000Z","date":"2018-05-09","kind":"sale","acquired":false,"shares":3100,"price":39.5,"value":122450.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $39.025 to $39.90. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":184478,"source":{"system":"sec-edgar","filing":"0001209191-18-029380","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118029380/doc4.xml","form_type":"4"}},{"id":3939004,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-05-10T19:46:16.000Z","date":"2018-05-09","kind":"sale","acquired":false,"shares":1300,"price":38.35,"value":49855.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.00 to $38.80. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":187578,"source":{"system":"sec-edgar","filing":"0001209191-18-029380","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118029380/doc4.xml","form_type":"4"}},{"id":3953634,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":157071,"kind":"person","name":"Ciechanover Isaac E.","position":1,"cik":"0001612096","reported_name":"Ciechanover Isaac E.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-04-30T16:15:10.000Z","date":"2018-04-27","kind":"sale","acquired":false,"shares":500,"price":43.95,"value":21975.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Transaction pursuant to Rule 10b5-1 Plan adopted May 18, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price in Column 4 is a weighted average sale price. The prices actually received ranged from $43.75 to $44.00. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Isaac E. Ciechanover and Allison M. Ciechanover Family Trust dated 8/8/08, of which the Reporting Person is a trustee."}],"balance_after":188878,"source":{"system":"sec-edgar","filing":"0001209191-18-026838","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1612096/000120919118026838/doc4.xml","form_type":"4"}}],"next_cursor":"2018-04-30T16:15:10.000000Z,3953634"}