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The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":40921,"source":{"system":"sec-edgar","filing":"0001209191-19-024478","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119024478/doc4.xml","form_type":"4"}},{"id":3556507,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2019-04-12T16:17:33.000Z","date":"2019-04-10","kind":"sale","acquired":false,"shares":1100,"price":156.4409,"value":172084.99,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $156.09 to $156.62. The average weighted price was $156.4409. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":41321,"source":{"system":"sec-edgar","filing":"0001209191-19-024478","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119024478/doc4.xml","form_type":"4"}},{"id":3556506,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2019-04-12T16:17:33.000Z","date":"2019-04-10","kind":"exercise","acquired":true,"shares":1500,"price":24.47,"value":36705.0,"ownership":{"direct":true},"balance_after":42421,"source":{"system":"sec-edgar","filing":"0001209191-19-024478","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119024478/doc4.xml","form_type":"4"}},{"id":3596923,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2019-03-13T16:14:55.000Z","date":"2019-03-11","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":14521,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-19-019141","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119019141/doc4.xml","form_type":"4"}},{"id":3596922,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2019-03-13T16:14:55.000Z","date":"2019-03-11","kind":"sale","acquired":false,"shares":1500,"price":139.7988,"value":209698.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $139.30 to $140.05. The average weighted price was $139.7988. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":40921,"source":{"system":"sec-edgar","filing":"0001209191-19-019141","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119019141/doc4.xml","form_type":"4"}},{"id":3596921,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2019-03-13T16:14:55.000Z","date":"2019-03-11","kind":"exercise","acquired":true,"shares":1500,"price":24.47,"value":36705.0,"ownership":{"direct":true},"balance_after":42421,"source":{"system":"sec-edgar","filing":"0001209191-19-019141","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119019141/doc4.xml","form_type":"4"}},{"id":3662800,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial and","other_text":"Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2019-02-12T16:11:51.000Z","date":"2019-02-08","kind":"disposition_to_issuer","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":16021,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-19-009284","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119009284/doc4.xml","form_type":"4"}},{"id":3662799,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial and","other_text":"Strategy Officer"}}],"security":"Common Stock","published_at":"2019-02-12T16:11:51.000Z","date":"2019-02-08","kind":"sale","acquired":false,"shares":500,"price":131.866,"value":65933.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $131.74 to $131.96. The average weighted price was $131.866. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":40921,"source":{"system":"sec-edgar","filing":"0001209191-19-009284","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119009284/doc4.xml","form_type":"4"}},{"id":3662798,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial and","other_text":"Strategy Officer"}}],"security":"Common Stock","published_at":"2019-02-12T16:11:51.000Z","date":"2019-02-08","kind":"sale","acquired":false,"shares":1000,"price":130.9948,"value":130994.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $130.60 to $131.50. The average weighted price was $130.9948. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":41421,"source":{"system":"sec-edgar","filing":"0001209191-19-009284","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119009284/doc4.xml","form_type":"4"}},{"id":3662797,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial and","other_text":"Strategy Officer"}}],"security":"Common 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01/04/2023."}],"balance_after":40921,"source":{"system":"sec-edgar","filing":"0001209191-19-007459","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119007459/doc4.xml","form_type":"4"}},{"id":3691720,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to 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The average weighted price was $125.1427. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":32483,"source":{"system":"sec-edgar","filing":"0001209191-19-004541","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119004541/doc4.xml","form_type":"4"}},{"id":3691718,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2019-01-18T16:06:28.000Z","date":"2019-01-16","kind":"exercise","acquired":true,"shares":3000,"price":24.47,"value":73410.0,"ownership":{"direct":true},"balance_after":35483,"source":{"system":"sec-edgar","filing":"0001209191-19-004541","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119004541/doc4.xml","form_type":"4"}},{"id":3698942,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2019-01-09T17:05:29.000Z","date":"2019-01-07","kind":"sale","acquired":false,"shares":1033,"price":114.3056,"value":118077.6848,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $113.78 to $114.72. The average weighted price was $114.3056. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":32483,"source":{"system":"sec-edgar","filing":"0001209191-19-003092","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119003092/doc4.xml","form_type":"4"}},{"id":3698941,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2019-01-09T17:05:29.000Z","date":"2019-01-07","kind":"sale","acquired":false,"shares":1979,"price":113.2886,"value":224198.1394,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $112.73 to $113.70. The average weighted price was $113.2886. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":33516,"source":{"system":"sec-edgar","filing":"0001209191-19-003092","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919119003092/doc4.xml","form_type":"4"}},{"id":3764422,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-11-14T16:10:12.000Z","date":"2018-11-09","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":20521,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-18-058508","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118058508/doc4.xml","form_type":"4"}},{"id":3764421,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-11-14T16:10:12.000Z","date":"2018-11-09","kind":"sale","acquired":false,"shares":480,"price":131.5465,"value":63142.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $131.46 to $131.625. The average weighted price was $131.5465. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-058508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118058508/doc4.xml","form_type":"4"}},{"id":3764420,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-11-14T16:10:12.000Z","date":"2018-11-09","kind":"sale","acquired":false,"shares":700,"price":130.6129,"value":91429.03,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $130.10 to $131.06. The average weighted price was $130.6129. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35975,"source":{"system":"sec-edgar","filing":"0001209191-18-058508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118058508/doc4.xml","form_type":"4"}},{"id":3764419,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-11-14T16:10:12.000Z","date":"2018-11-09","kind":"sale","acquired":false,"shares":320,"price":129.1225,"value":41319.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $128.90 to $129.61. The average weighted price was $129.1225. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":36675,"source":{"system":"sec-edgar","filing":"0001209191-18-058508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118058508/doc4.xml","form_type":"4"}},{"id":3764418,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-11-14T16:10:12.000Z","date":"2018-11-09","kind":"exercise","acquired":true,"shares":1500,"price":24.47,"value":36705.0,"ownership":{"direct":true},"balance_after":36995,"source":{"system":"sec-edgar","filing":"0001209191-18-058508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118058508/doc4.xml","form_type":"4"}},{"id":3791807,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-10-12T16:53:18.000Z","date":"2018-10-10","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":22021,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-18-054899","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118054899/doc4.xml","form_type":"4"}},{"id":3791806,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-10-12T16:53:18.000Z","date":"2018-10-10","kind":"sale","acquired":false,"shares":100,"price":136.83,"value":13683.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-054899","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118054899/doc4.xml","form_type":"4"}},{"id":3791805,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-10-12T16:53:18.000Z","date":"2018-10-10","kind":"sale","acquired":false,"shares":300,"price":135.6967,"value":40709.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $135.55 to $135.99. The average weighted price was $135.6967. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35595,"source":{"system":"sec-edgar","filing":"0001209191-18-054899","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118054899/doc4.xml","form_type":"4"}},{"id":3791804,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-10-12T16:53:18.000Z","date":"2018-10-10","kind":"sale","acquired":false,"shares":1100,"price":134.9518,"value":148446.98,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $134.50 to $135.33. The average weighted price was $134.9518. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35895,"source":{"system":"sec-edgar","filing":"0001209191-18-054899","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118054899/doc4.xml","form_type":"4"}},{"id":3791803,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-10-12T16:53:18.000Z","date":"2018-10-10","kind":"exercise","acquired":true,"shares":1500,"price":24.47,"value":36705.0,"ownership":{"direct":true},"balance_after":36995,"source":{"system":"sec-edgar","filing":"0001209191-18-054899","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118054899/doc4.xml","form_type":"4"}},{"id":3817981,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-09-12T16:12:52.000Z","date":"2018-09-10","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":23521,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-18-050632","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118050632/doc4.xml","form_type":"4"}},{"id":3817980,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-12T16:12:52.000Z","date":"2018-09-10","kind":"sale","acquired":false,"shares":299,"price":151.5667,"value":45318.4433,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $151.45 to $151.70. The average weighted price was $151.5667. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-050632","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118050632/doc4.xml","form_type":"4"}},{"id":3817979,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-12T16:12:52.000Z","date":"2018-09-10","kind":"sale","acquired":false,"shares":700,"price":150.2357,"value":105164.99,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $150.00 to $150.65. The average weighted price was $150.2357. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-050632","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118050632/doc4.xml","form_type":"4"}},{"id":3817978,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-12T16:12:52.000Z","date":"2018-09-10","kind":"sale","acquired":false,"shares":501,"price":149.2211,"value":74759.7711,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $149.00 to $149.75. The average weighted price was $149.2211. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":36494,"source":{"system":"sec-edgar","filing":"0001209191-18-050632","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118050632/doc4.xml","form_type":"4"}},{"id":3817977,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-12T16:12:52.000Z","date":"2018-09-10","kind":"exercise","acquired":true,"shares":1500,"price":24.47,"value":36705.0,"ownership":{"direct":true},"balance_after":36995,"source":{"system":"sec-edgar","filing":"0001209191-18-050632","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118050632/doc4.xml","form_type":"4"}},{"id":3827154,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":false,"shares":7250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":25021,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":7250},"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827153,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":false,"shares":4007,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option to purchase shares of our common stock was granted on January 16, 2013 with performance-based vesting criteria that were met as of January 1, 2013 and April 1, 2013.  The shares underlying these options vested as follows: 25% vested on January 1, 2014 and April 1, 2014, respectively, with the remainder of the shares vesting in equal monthly installments over the following three years."}],"balance_after":0,"derivative":{"exercise_price":5.5004,"expiration_date":"2023-01-16","underlying":"Common Stock","underlying_shares":4007},"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827152,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":false,"shares":8743,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This option vested over a four-year period, at a rate of twenty-five percent (25%) on May 16, 2012 and in 36 equal monthly installments thereafter."}],"balance_after":0,"derivative":{"exercise_price":2.0864,"expiration_date":"2021-07-13","underlying":"Common Stock","underlying_shares":8743},"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827151,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"sale","acquired":false,"shares":978,"price":176.0273,"value":172154.6994,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $176.00 to $176.20. The average weighted price was $176.0273. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827150,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"sale","acquired":false,"shares":19022,"price":175.365,"value":3335793.03,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $175.00 to $175.95. The average weighted price was $175.365. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":36473,"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827149,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":true,"shares":7250,"price":24.47,"value":177407.5,"ownership":{"direct":true},"balance_after":55495,"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827148,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":true,"shares":4007,"price":5.5004,"value":22040.1028,"ownership":{"direct":true},"balance_after":48245,"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3827147,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-09-04T17:03:14.000Z","date":"2018-08-30","kind":"exercise","acquired":true,"shares":8743,"price":2.0864,"value":18241.3952,"ownership":{"direct":true},"balance_after":44238,"source":{"system":"sec-edgar","filing":"0001209191-18-049247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118049247/doc4.xml","form_type":"4"}},{"id":3844598,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"This option to purchase shares of our common stock was granted on January 16, 2013 with performance-based vesting criteria that were met as of January 1, 2013.  The shares underlying these options vested as follows: 25% vested on January 1, 2014, with the remainder of the shares vesting in equal monthly installments over the following three years."}],"balance_after":4007,"derivative":{"exercise_price":5.5004,"expiration_date":"2023-01-16","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3844597,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"sale","acquired":false,"shares":105,"price":158.5667,"value":16649.5035,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The range of prices for the transaction reported on this line was $158.55 to $158.90. The average weighted price was $158.5667. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3844596,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"sale","acquired":false,"shares":620,"price":157.8581,"value":97872.022,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $157.30 to $158.20. The average weighted price was $157.8581. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35600,"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3844595,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"sale","acquired":false,"shares":350,"price":156.6293,"value":54820.255,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $156.20 to $156.95. The average weighted price was $156.6293. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":36220,"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3844594,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"sale","acquired":false,"shares":425,"price":155.4059,"value":66047.5075,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $155.15 to $156.05. The average weighted price was $155.4059. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":36570,"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3844593,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-14T16:47:06.000Z","date":"2018-08-10","kind":"exercise","acquired":true,"shares":1500,"price":5.5004,"value":8250.6,"ownership":{"direct":true},"balance_after":36995,"source":{"system":"sec-edgar","filing":"0001209191-18-046622","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118046622/doc4.xml","form_type":"4"}},{"id":3851804,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"exercise","acquired":false,"shares":21500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"This option to purchase shares of our common stock was granted on January 16, 2013 with performance-based vesting criteria that were met as of January 1, 2013 and as of May 1, 2013.  The shares underlying these options vested as follows: 25% vested on January 1, 2014 and May 1, 2014, respectively, with the remainder of the shares vesting in equal monthly installments over the following three years."}],"balance_after":5507,"derivative":{"exercise_price":5.5004,"expiration_date":"2023-01-16","underlying":"Common Stock","underlying_shares":21500},"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851803,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":500,"price":155.42,"value":77710.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The range of prices for the transaction reported on this line was $155.35 to $155.55. The average weighted price was $155.42. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851802,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":3100,"price":154.579,"value":479194.9,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The range of prices for the transaction reported on this line was $154.00 to $154.95. The average weighted price was $154.5790. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35995,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851801,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":3358,"price":153.3472,"value":514939.8976,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The range of prices for the transaction reported on this line was $153.00 to $153.95. The average weighted price was $153.3472. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":39095,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851800,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":2601,"price":152.5134,"value":396687.3534,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $152.00 to $152.95. The average weighted price was $152.5134. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":42453,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851799,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":3976,"price":151.5876,"value":602712.2976,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $151.00 to $151.95. The average weighted price was $151.5876. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":45054,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851798,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"sale","acquired":false,"shares":7965,"price":150.3137,"value":1197248.6205,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 2, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $150.00 to $150.95. The average weighted price was $150.3137. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":49030,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":3851797,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-08-06T16:10:22.000Z","date":"2018-08-02","kind":"exercise","acquired":true,"shares":21500,"price":5.5004,"value":118258.6,"ownership":{"direct":true},"balance_after":56995,"source":{"system":"sec-edgar","filing":"0001209191-18-045510","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118045510/doc4.xml","form_type":"4"}},{"id":4076012,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2018-02-05T16:04:51.000Z","date":"2018-02-01","kind":"grant","acquired":true,"shares":45000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests over a four-year period, at a rate of twenty-five percent (25%) on January 4, 2019, and in 36 equal monthly installments."}],"balance_after":45000,"derivative":{"exercise_price":205.25,"expiration_date":"2028-02-01","underlying":"Common Stock","underlying_shares":45000},"source":{"system":"sec-edgar","filing":"0001209191-18-007412","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118007412/doc4.xml","form_type":"4"}},{"id":4076011,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-02-05T16:04:51.000Z","date":"2018-02-01","kind":"grant","acquired":true,"shares":11250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock units for common stock vest over a four-year period at a rate of 25% on 01/04/2019, 25% on 01/04/2020, 25% on 01/04/2021, and 25% on 01/04/2022."}],"balance_after":35495,"source":{"system":"sec-edgar","filing":"0001209191-18-007412","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118007412/doc4.xml","form_type":"4"}},{"id":4102888,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-01-09T16:07:19.000Z","date":"2018-01-05","kind":"sale","acquired":false,"shares":401,"price":174.1704,"value":69842.3304,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range in prices for the transaction reported on this line was $173.85 to $174.35. The average weighted price was $174.1704. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":24245,"source":{"system":"sec-edgar","filing":"0001209191-18-002906","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118002906/doc4.xml","form_type":"4"}},{"id":4102887,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2018-01-09T16:07:19.000Z","date":"2018-01-05","kind":"sale","acquired":false,"shares":2659,"price":173.2561,"value":460687.9699,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range in prices for the transaction reported on this line was $172.85 to $173.80. The average weighted price was $173.2561. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":24646,"source":{"system":"sec-edgar","filing":"0001209191-18-002906","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919118002906/doc4.xml","form_type":"4"}},{"id":4133207,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"exercise","acquired":false,"shares":9900,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"This option vests over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":32271,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":9900},"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133206,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":1420,"price":221.5169,"value":314553.998,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The range of prices for the transaction reported on this line was $221.3000 to $221.6750. The average weighted price was $221.5169. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":27305,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133205,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":680,"price":220.5206,"value":149954.008,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The range of prices for the transaction reported on this line was $220.1500 to $221.0500. The average weighted price was $220.5206. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":28725,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133204,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":800,"price":219.4855,"value":175588.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The range of prices for the transaction reported on this line was $219.0000 to $219.7000. The average weighted price was $219.4855. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":29405,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133203,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":950,"price":218.0895,"value":207185.025,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The range of prices for the transaction reported on this line was $218.0000 to $218.2500. The average weighted price was $218.0895. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":30205,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133202,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":2550,"price":217.3318,"value":554196.09,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The range of prices for the transaction reported on this line was $217.0000 to $217.9500. The average weighted price was $217.3318. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":31155,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133201,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":380,"price":214.5842,"value":81541.996,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The range of prices for the transaction reported on this line was $214.4000 to $215.1000. The average weighted price was $214.5842. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":33705,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133200,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":520,"price":213.6462,"value":111096.024,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The range of prices for the transaction reported on this line was $213.1500 to $214.0000. The average weighted price was $213.6462. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":34085,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133199,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":1200,"price":212.7004,"value":255240.48,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $212.1000 to $213.0000. The average weighted price was $212.7004. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":34605,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133198,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":101,"price":211.0594,"value":21316.9994,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $211.0500 to $212.0000. The average weighted price was $211.0594. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35805,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133197,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"sale","acquired":false,"shares":1299,"price":210.2482,"value":273112.4118,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $210.0500 to $210.8750. The average weighted price was $210.2482. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35906,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4133196,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-12-13T16:09:17.000Z","date":"2017-12-11","kind":"exercise","acquired":true,"shares":9900,"price":24.47,"value":242253.0,"ownership":{"direct":true},"balance_after":37205,"source":{"system":"sec-edgar","filing":"0001209191-17-065414","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117065414/doc4.xml","form_type":"4"}},{"id":4163529,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":false,"shares":7829,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"This option vests over a four-year period, at a rate of twenty-five percent (25%) on January 1, 2015 and in 36 equal monthly installments thereafter."}],"balance_after":42171,"derivative":{"exercise_price":24.47,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":7829},"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163528,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":false,"shares":578,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"This option to purchase shares of our common stock granted on January 16, 2013 with performance-based vesting criteria that were met as of April 1, 2013. The shares underlying these options vested as follows: 25% vested on April 1, 2014, with the remainder of the shares vesting in equal monthly installments over the following three years."}],"balance_after":27007,"derivative":{"exercise_price":5.5004,"expiration_date":"2023-01-16","underlying":"Common Stock","underlying_shares":578},"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163527,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Stock Option (right to buy)","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":false,"shares":1493,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option vests over a four-year period, at a rate of twenty-five percent (25%) on May 16, 2012 and in 36 equal monthly installments thereafter."}],"balance_after":8743,"derivative":{"exercise_price":2.0864,"expiration_date":"2021-07-13","underlying":"Common Stock","underlying_shares":1493},"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163526,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"sale","acquired":false,"shares":1200,"price":150.1833,"value":180219.96,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The range of prices for the transaction reported on this line was $150.1000 to $150.2750. The average weighted price was $150.1833. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":27305,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163525,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"sale","acquired":false,"shares":6600,"price":149.7363,"value":988259.58,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The range of prices for the transaction reported on this line was $149.1000 to $150.0750. The average weighted price was $149.7363. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":28505,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163524,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"sale","acquired":false,"shares":2100,"price":148.7548,"value":312385.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The range of prices for the transaction reported on this line was $148.1000 to $149.0500. The average weighted price was $148.7548. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35105,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163523,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":true,"shares":7829,"price":24.47,"value":191575.63,"ownership":{"direct":true},"balance_after":37205,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163522,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":true,"shares":578,"price":5.5004,"value":3179.2312,"ownership":{"direct":true},"balance_after":29376,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}},{"id":4163521,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":43108,"kind":"person","name":"Walsh Jeffrey T.","position":1,"cik":"0001578251","reported_name":"Walsh Jeffrey T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Chief Financial","other_text":"and Strategy Officer"}}],"security":"Common Stock","published_at":"2017-11-14T16:02:21.000Z","date":"2017-11-10","kind":"exercise","acquired":true,"shares":1493,"price":2.0864,"value":3114.9952,"ownership":{"direct":true},"balance_after":28798,"source":{"system":"sec-edgar","filing":"0001209191-17-060589","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000120919117060589/doc4.xml","form_type":"4"}}],"next_cursor":"2017-11-14T16:02:21.000000Z,4163521"}