{"transactions":[{"id":1124567,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-03T17:18:42.000Z","date":"2025-06-02","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":1245,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to the terms of the Merger Agreement, immediately prior to the Effective Time, each time-based restricted stock unit award with respect to shares that is, at the time of determination, subject to vesting or forfeiture conditions and that is not a PSU Award (as defined below) (but including, for clarity, any PSU Award that is subject solely to service-based vesting conditions as of the Effective Time) (\"RSU Award\") that is outstanding as of immediately prior thereto, shall (a) accelerate and become fully vested, and (b) by virtue of the Merger automatically (except as otherwise provided in the Merger Agreement) and without any action on the part of the Issuer, Parent or the holder thereof, be canceled and terminated and converted into the right to receive"},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"(Continued from footnote 1) (i) an amount in cash equal to the product of the number of shares underlying such RSU Award immediately prior to the Effective Time and $3.00 in cash, subject to any applicable withholding taxes and without interest thereon plus (ii) one CVR with respect to each share subject to such RSU Award immediately prior to the Effective Time."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-25-081115","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000095017025081115/ownership.xml","form_type":"4"}},{"id":1124566,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-03T17:18:42.000Z","date":"2025-05-30","kind":"other","planned":false,"acquired":false,"shares":6150,"ownership":{"direct":false,"nature":"Nick Leschly Irrevocable GST Trust of 2019"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In connection with the terms of an Agreement and Plan of Merger, dated as of February 21, 2025 (as amended, the \"Merger Agreement\"), by and among the Issuer, Beacon Parent Holdings, L.P. (\"Parent\") and Beacon Merger Sub, Inc., an indirect wholly owned subsidiary of Parent (\"Purchaser\"), Purchaser completed a tender offer for shares of the Issuer's Common Stock. Tendering stockholders were given the option to receive per share consideration of either (x) $3.00 in cash per share, subject to any applicable withholding taxes and without interest thereon, plus one contingent value right (\"CVR\") per share, representing the right to receive one contingent payment of $6.84, in cash, subject to any applicable withholding taxes and without interest thereon, upon achievement of the specified milestone or (y) $5.00 in cash per share, subject to any applicable withholding taxes and without interest thereon (collectively, the \"Offer Price\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"(Continued from footnote 1) After completion of the tender offer, Purchaser merged with and into the Issuer (the \"Merger\"), effective as of June 2, 2025 (the \"Effective Time\"), with the Issuer continuing as the surviving entity and a wholly owned subsidiary of Parent."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-25-081115","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000095017025081115/ownership.xml","form_type":"4"}},{"id":1124565,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-03T17:18:42.000Z","date":"2025-05-30","kind":"other","planned":false,"acquired":false,"shares":2284,"ownership":{"direct":false,"nature":"Nick Leschly 2001 Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In connection with the terms of an Agreement and Plan of Merger, dated as of February 21, 2025 (as amended, the \"Merger Agreement\"), by and among the Issuer, Beacon Parent Holdings, L.P. (\"Parent\") and Beacon Merger Sub, Inc., an indirect wholly owned subsidiary of Parent (\"Purchaser\"), Purchaser completed a tender offer for shares of the Issuer's Common Stock. Tendering stockholders were given the option to receive per share consideration of either (x) $3.00 in cash per share, subject to any applicable withholding taxes and without interest thereon, plus one contingent value right (\"CVR\") per share, representing the right to receive one contingent payment of $6.84, in cash, subject to any applicable withholding taxes and without interest thereon, upon achievement of the specified milestone or (y) $5.00 in cash per share, subject to any applicable withholding taxes and without interest thereon (collectively, the \"Offer Price\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"(Continued from footnote 1) After completion of the tender offer, Purchaser merged with and into the Issuer (the \"Merger\"), effective as of June 2, 2025 (the \"Effective Time\"), with the Issuer continuing as the surviving entity and a wholly owned subsidiary of Parent."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-25-081115","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000095017025081115/ownership.xml","form_type":"4"}},{"id":1124564,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-03T17:18:42.000Z","date":"2025-05-30","kind":"other","planned":false,"acquired":false,"shares":14416,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In connection with the terms of an Agreement and Plan of Merger, dated as of February 21, 2025 (as amended, the \"Merger Agreement\"), by and among the Issuer, Beacon Parent Holdings, L.P. (\"Parent\") and Beacon Merger Sub, Inc., an indirect wholly owned subsidiary of Parent (\"Purchaser\"), Purchaser completed a tender offer for shares of the Issuer's Common Stock. Tendering stockholders were given the option to receive per share consideration of either (x) $3.00 in cash per share, subject to any applicable withholding taxes and without interest thereon, plus one contingent value right (\"CVR\") per share, representing the right to receive one contingent payment of $6.84, in cash, subject to any applicable withholding taxes and without interest thereon, upon achievement of the specified milestone or (y) $5.00 in cash per share, subject to any applicable withholding taxes and without interest thereon (collectively, the \"Offer Price\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"(Continued from footnote 1) After completion of the tender offer, Purchaser merged with and into the Issuer (the \"Merger\"), effective as of June 2, 2025 (the \"Effective Time\"), with the Issuer continuing as the surviving entity and a wholly owned subsidiary of Parent."}],"balance_after":1245,"source":{"system":"sec-edgar","filing":"0000950170-25-081115","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000095017025081115/ownership.xml","form_type":"4"}},{"id":1147597,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to buy)","published_at":"2025-05-15T16:35:59.000Z","date":"2025-05-13","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":469000,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Pursuant to the terms of the Merger Agreement, each outstanding option to purchase shares of Company Common Stock (\"Company Option\"), whether vested or unvested, that was outstanding immediately prior to the Effective Time and had a per share exercise price that was less than the Merger Consideration became fully vested, was cancelled and automatically converted into the right to receive for each share of Company Common Stock underlying such Company Option, an amount (without interest and subject to deduction for any required withholding under applicable law) in cash equal to the excess of the Merger Consideration over the per share exercise price of such Company Option. Each Company Option, whether vested or unvested, that was outstanding and unexercised immediately prior to the Effective Time and had a per share exercise price that is equal to or greater than the Merger Consideration was automatically cancelled for no consideration."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Pursuant to the terms of the Merger Agreement, each outstanding option to purchase shares of Company Common Stock (\"Company Option\"), whether vested or unvested, that was outstanding immediately prior to the Effective Time and had a per share exercise price that was less than the Merger Consideration became fully vested, was cancelled and automatically converted into the right to receive for each share of Company Common Stock underlying such Company Option, an amount (without interest and subject to deduction for any required withholding under applicable law) in cash equal to the excess of the Merger Consideration over the per share exercise price of such Company Option. Each Company Option, whether vested or unvested, that was outstanding and unexercised immediately prior to the Effective Time and had a per share exercise price that is equal to or greater than the Merger Consideration was automatically cancelled for no consideration."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Pursuant to the terms of the Merger Agreement, each outstanding option to purchase shares of Company Common Stock (\"Company Option\"), whether vested or unvested, that was outstanding immediately prior to the Effective Time and had a per share exercise price that was less than the Merger Consideration became fully vested, was cancelled and automatically converted into the right to receive for each share of Company Common Stock underlying such Company Option, an amount (without interest and subject to deduction for any required withholding under applicable law) in cash equal to the excess of the Merger Consideration over the per share exercise price of such Company Option. Each Company Option, whether vested or unvested, that was outstanding and unexercised immediately prior to the Effective Time and had a per share exercise price that is equal to or greater than the Merger Consideration was automatically cancelled for no consideration."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Pursuant to the terms of the Merger Agreement, each outstanding option to purchase shares of Company Common Stock (\"Company Option\"), whether vested or unvested, that was outstanding immediately prior to the Effective Time and had a per share exercise price that was less than the Merger Consideration became fully vested, was cancelled and automatically converted into the right to receive for each share of Company Common Stock underlying such Company Option, an amount (without interest and subject to deduction for any required withholding under applicable law) in cash equal to the excess of the Merger Consideration over the per share exercise price of such Company Option. Each Company Option, whether vested or unvested, that was outstanding and unexercised immediately prior to the Effective Time and had a per share exercise price that is equal to or greater than the Merger Consideration was automatically cancelled for no consideration."}],"balance_after":0,"derivative":{"exercise_price":3.97,"underlying":"Common Stock","underlying_shares":469000},"source":{"system":"sec-edgar","filing":"0001562180-25-003887","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025003887/primarydocument.xml","form_type":"4"}},{"id":1147596,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-15T16:35:59.000Z","date":"2025-05-13","kind":"other","planned":false,"acquired":false,"shares":41000,"ownership":{"direct":false,"nature":"Nick Leschly Irrevocable GST Trust of 2019"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the \"Merger Agreement\"), dated as of March 10, 2025, by and among the Issuer, Bristol-Myers Squibb Company (\"Parent\"), and Daybreak Merger Sub Inc., a wholly owned subsidiary of Parent (\"Merger Sub\"). Pursuant to the Merger Agreement, Merger Sub completed a cash tender offer to acquire all of the issued and outstanding shares of common stock of the Issuer, par value $0.0001 per share (the \"Company Common Stock\"), for a price per share of $5.00 (the \"Merger Consideration\"), without interest and subject to any withholding of taxes required by applicable law. Effective as of May 13, 2025, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and as a wholly owned subsidiary of Parent (the \"Merger\")."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each share of Company Common Stock was tendered in exchange for the Merger Consideration, without interest and subject to any withholding of taxes required by applicable law."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001562180-25-003887","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025003887/primarydocument.xml","form_type":"4"}},{"id":1147595,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-15T16:35:59.000Z","date":"2025-05-13","kind":"other","planned":false,"acquired":false,"shares":15233,"ownership":{"direct":false,"nature":"Nick Leschly 2001 Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the \"Merger Agreement\"), dated as of March 10, 2025, by and among the Issuer, Bristol-Myers Squibb Company (\"Parent\"), and Daybreak Merger Sub Inc., a wholly owned subsidiary of Parent (\"Merger Sub\"). Pursuant to the Merger Agreement, Merger Sub completed a cash tender offer to acquire all of the issued and outstanding shares of common stock of the Issuer, par value $0.0001 per share (the \"Company Common Stock\"), for a price per share of $5.00 (the \"Merger Consideration\"), without interest and subject to any withholding of taxes required by applicable law. Effective as of May 13, 2025, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and as a wholly owned subsidiary of Parent (the \"Merger\")."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each share of Company Common Stock was tendered in exchange for the Merger Consideration, without interest and subject to any withholding of taxes required by applicable law."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001562180-25-003887","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025003887/primarydocument.xml","form_type":"4"}},{"id":1147594,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-15T16:35:59.000Z","date":"2025-05-13","kind":"other","planned":false,"acquired":false,"shares":897642,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the \"Merger Agreement\"), dated as of March 10, 2025, by and among the Issuer, Bristol-Myers Squibb Company (\"Parent\"), and Daybreak Merger Sub Inc., a wholly owned subsidiary of Parent (\"Merger Sub\"). Pursuant to the Merger Agreement, Merger Sub completed a cash tender offer to acquire all of the issued and outstanding shares of common stock of the Issuer, par value $0.0001 per share (the \"Company Common Stock\"), for a price per share of $5.00 (the \"Merger Consideration\"), without interest and subject to any withholding of taxes required by applicable law. Effective as of May 13, 2025, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and as a wholly owned subsidiary of Parent (the \"Merger\")."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each share of Company Common Stock was tendered in exchange for the Merger Consideration, without interest and subject to any withholding of taxes required by applicable law."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001562180-25-003887","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025003887/primarydocument.xml","form_type":"4"}},{"id":1147593,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-15T16:35:59.000Z","date":"2025-05-13","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":335964,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the \"Merger Agreement\"), dated as of March 10, 2025, by and among the Issuer, Bristol-Myers Squibb Company (\"Parent\"), and Daybreak Merger Sub Inc., a wholly owned subsidiary of Parent (\"Merger Sub\"). Pursuant to the Merger Agreement, Merger Sub completed a cash tender offer to acquire all of the issued and outstanding shares of common stock of the Issuer, par value $0.0001 per share (the \"Company Common Stock\"), for a price per share of $5.00 (the \"Merger Consideration\"), without interest and subject to any withholding of taxes required by applicable law. Effective as of May 13, 2025, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and as a wholly owned subsidiary of Parent (the \"Merger\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Pursuant to the terms of the Merger Agreement, each share of Company Common Stock subject to issuance pursuant to outstanding restricted stock units (each, a \"Company RSU Award\"), whether vested or unvested that was outstanding immediately prior to the effective time of the Merger (the \"Effective Time\"), became fully vested, and was cancelled and automatically converted into the right to receive, for each share of Company Common Stock underlying such Company RSU Award, an amount (without interest and subject to deduction for any required withholding under applicable law relating to tax) in cash equal to the Merger Consideration."}],"balance_after":897642,"source":{"system":"sec-edgar","filing":"0001562180-25-003887","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025003887/primarydocument.xml","form_type":"4"}},{"id":1308255,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-01-07T16:42:17.000Z","date":"2025-01-06","kind":"sale","planned":false,"acquired":false,"shares":892,"price":2.7785,"value":2478.422,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.76 to $2.785, inclusive. 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":1233606,"source":{"system":"sec-edgar","filing":"0001562180-25-000245","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025000245/primarydocument.xml","form_type":"4"}},{"id":1308254,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-01-07T16:42:17.000Z","date":"2025-01-03","kind":"sale","planned":false,"acquired":false,"shares":85978,"price":2.9359,"value":252422.8102,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.87 to $3.01, inclusive. 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":1234498,"source":{"system":"sec-edgar","filing":"0001562180-25-000245","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218025000245/primarydocument.xml","form_type":"4"}},{"id":1371234,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2024-11-08T16:09:06.000Z","date":"2024-11-06","kind":"grant","planned":false,"acquired":true,"shares":49850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests 100% on the earlier of November 6, 2025 or the date of the next annual meeting of stockholders."}],"balance_after":49850,"derivative":{"exercise_price":0.44,"expiration_date":"2034-11-06","underlying":"Common Stock","underlying_shares":49850},"source":{"system":"sec-edgar","filing":"0001562180-24-007609","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218024007609/primarydocument.xml","form_type":"4"}},{"id":1371233,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-11-08T16:09:06.000Z","date":"2024-11-06","kind":"grant","planned":false,"acquired":true,"shares":24900,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"These restricted stock units for common stock vest 100% on the earlier of November 6, 2025 or the date of the next annual meeting of stockholders."}],"balance_after":315839,"source":{"system":"sec-edgar","filing":"0001562180-24-007609","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218024007609/primarydocument.xml","form_type":"4"}},{"id":1682909,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (Right to buy)","published_at":"2024-01-09T16:08:58.000Z","date":"2024-01-08","kind":"grant","planned":false,"acquired":true,"shares":469000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This stock option vests over a four-year period at the rate of 25% on 01/02/2025, and then in 36 equal monthly installments thereafter."}],"balance_after":469000,"derivative":{"exercise_price":3.97,"expiration_date":"2034-01-08","underlying":"Common Stock","underlying_shares":469000},"source":{"system":"sec-edgar","filing":"0001562180-24-000364","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218024000364/primarydocument.xml","form_type":"4"}},{"id":1682908,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-01-09T16:08:58.000Z","date":"2024-01-08","kind":"grant","planned":false,"acquired":true,"shares":235000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F3","text":"RSU awards vest over a four-year period at the rate of 25% on 01/02/2025, 25% on 01/02/2026, 25% on 01/02/2027, and 25% on 01/02/2028."}],"balance_after":1320476,"source":{"system":"sec-edgar","filing":"0001562180-24-000364","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218024000364/primarydocument.xml","form_type":"4"}},{"id":1682907,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-01-09T16:08:58.000Z","date":"2024-01-05","kind":"sale","planned":false,"acquired":false,"shares":1554,"price":3.7536,"value":5833.0944,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold to cover tax withholding obligations incurred in connection with the vesting of restricted stock units (\"RSUs\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.675 to $3.83, inclusive. 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":1085476,"source":{"system":"sec-edgar","filing":"0001562180-24-000364","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218024000364/primarydocument.xml","form_type":"4"}},{"id":1685710,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-01-05T16:30:38.000Z","date":"2024-01-03","kind":"sale","planned":false,"acquired":false,"shares":72312,"price":3.8685,"value":279738.972,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.83 to $3.96, inclusive. 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":1087030,"source":{"system":"sec-edgar","filing":"0001562180-24-000305","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218024000305/primarydocument.xml","form_type":"4"}},{"id":1797851,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-08-24T17:04:27.000Z","date":"2023-08-22","kind":"sale","planned":true,"acquired":false,"shares":9312,"price":5.4865,"value":51090.288,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.46 to $5.535, inclusive. 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":1159342,"source":{"system":"sec-edgar","filing":"0001562180-23-006560","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023006560/primarydocument.xml","form_type":"4"}},{"id":1813934,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-08-07T16:07:13.000Z","date":"2023-08-03","kind":"sale","planned":true,"acquired":false,"shares":9060,"price":6.1257,"value":55498.842,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.06 to $6.23, inclusive. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"The Form 4 filed on July 19, 2022 inadvertently understated the Reporting Person's holdings by 133,500 shares, an error that was carried forward on subsequent filings. Column 5 of Table I reflects the number of shares of Issuer common stock beneficially owned by the Reporting Person following the reported transactions as of August 7, 2023."}],"balance_after":1168654,"source":{"system":"sec-edgar","filing":"0001562180-23-006222","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023006222/primarydocument.xml","form_type":"4"}},{"id":1844046,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true}}],"security":"Stock Option (right to buy)","published_at":"2023-06-26T18:25:56.000Z","date":"2023-06-22","kind":"grant","planned":false,"acquired":true,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests and becomes exercisable in full on the earlier of (A) the first anniversary of the date of grant or (B) immediately prior to the next annual meeting of the Corporation's stockholders after the date of grant, subject to the non-employee director's continued service as a director of the Corporation."}],"balance_after":30000,"derivative":{"exercise_price":0.504,"expiration_date":"2033-06-22","underlying":"Common Stock","underlying_shares":30000},"source":{"system":"sec-edgar","filing":"0000950170-23-029808","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023029808/ownership.xml","form_type":"4"}},{"id":1849266,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2023-06-20T16:31:00.000Z","date":"2023-06-16","kind":"grant","planned":false,"acquired":true,"shares":21600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests 100% on the earlier of June 16, 2024 or the date of the next annual meeting of stockholders."}],"balance_after":21600,"derivative":{"exercise_price":3.81,"expiration_date":"2033-06-16","underlying":"Common Stock","underlying_shares":21600},"source":{"system":"sec-edgar","filing":"0001562180-23-005350","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218023005350/primarydocument.xml","form_type":"4"}},{"id":1849265,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-06-20T16:31:00.000Z","date":"2023-06-16","kind":"grant","planned":false,"acquired":true,"shares":10790,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"These restricted stock units for common stock vest 100% on the earlier of June 16, 2024 or the date of the next annual meeting of stockholders."}],"balance_after":290939,"source":{"system":"sec-edgar","filing":"0001562180-23-005350","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218023005350/primarydocument.xml","form_type":"4"}},{"id":2033325,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (Right to buy)","published_at":"2023-02-03T16:59:18.000Z","date":"2023-02-01","kind":"grant","acquired":true,"shares":162500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This stock option vests over a four-year period at the rate of 25% on 01/01/2024, and then in 36 equal monthly installments thereafter."}],"balance_after":162500,"derivative":{"exercise_price":13.2,"expiration_date":"2033-02-01","underlying":"Common Stock","underlying_shares":162500},"source":{"system":"sec-edgar","filing":"0001562180-23-000949","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000949/primarydocument.xml","form_type":"4"}},{"id":2033324,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-02-03T16:59:18.000Z","date":"2023-02-01","kind":"grant","acquired":true,"shares":428571,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"This restricted stock unit award vests over a three-year period at the rate of 40% on 01/01/2024, 40% on 01/01/2025, and 20% on 01/01/2026."}],"balance_after":1044214,"source":{"system":"sec-edgar","filing":"0001562180-23-000949","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000949/primarydocument.xml","form_type":"4"}},{"id":2033323,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-02-03T16:59:18.000Z","date":"2023-02-01","kind":"grant","acquired":true,"shares":81250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This restricted stock unit award vests over a four-year period at the rate of 25% on 01/01/2024, 25% on 01/01/2025, 25% on 01/01/2026, and 25% on 01/01/2027."}],"balance_after":615643,"source":{"system":"sec-edgar","filing":"0001562180-23-000949","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000949/primarydocument.xml","form_type":"4"}},{"id":2052692,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-01-18T17:18:28.000Z","date":"2023-01-11","kind":"sale","acquired":false,"shares":2026,"price":10.6281,"value":21532.5306,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.25 to $10.78, inclusive. 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":534393,"source":{"system":"sec-edgar","filing":"0001562180-23-000483","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000483/primarydocument.xml","form_type":"4"}},{"id":2053853,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-01-17T16:30:45.000Z","date":"2023-01-12","kind":"sale","acquired":false,"shares":6587,"price":10.4584,"value":68889.4808,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.35 to $10.52, inclusive. 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":536419,"source":{"system":"sec-edgar","filing":"0001562180-23-000444","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000444/primarydocument.xml","form_type":"4"}},{"id":2054608,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-01-13T16:19:22.000Z","date":"2023-01-11","kind":"sale","acquired":false,"shares":4290,"price":7.8043,"value":33480.447,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $7.61 to $7.93. The average weighted price was $7.8043. 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":280149,"source":{"system":"sec-edgar","filing":"0001562180-23-000407","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218023000407/primarydocument.xml","form_type":"4"}},{"id":2056572,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-01-11T16:23:39.000Z","date":"2023-01-09","kind":"sale","acquired":false,"shares":2979,"price":10.3347,"value":30787.0713,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.19 to $10.48, inclusive. 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":543006,"source":{"system":"sec-edgar","filing":"0001562180-23-000355","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218023000355/primarydocument.xml","form_type":"4"}},{"id":2192045,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-08-08T17:08:29.000Z","date":"2022-08-05","kind":"sale","acquired":false,"shares":5499,"price":16.2325,"value":89262.5175,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.39 to $16.71, inclusive. 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":545985,"source":{"system":"sec-edgar","filing":"0001562180-22-005949","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022005949/primarydocument.xml","form_type":"4"}},{"id":2205464,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-07-19T16:22:04.000Z","date":"2022-07-15","kind":"sale","acquired":false,"shares":5404,"price":13.8099,"value":74628.6996,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.63 to $14.07, inclusive. 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":551484,"source":{"system":"sec-edgar","filing":"0001562180-22-005709","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022005709/primarydocument.xml","form_type":"4"}},{"id":2222935,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2022-06-23T18:09:33.000Z","date":"2022-06-22","kind":"grant","acquired":true,"shares":5000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests 100% on the earlier of June 22, 2023 or the date of the next annual meeting of stockholders."}],"balance_after":5000,"derivative":{"exercise_price":4.46,"expiration_date":"2032-06-22","underlying":"Common Stock","underlying_shares":5000},"source":{"system":"sec-edgar","filing":"0001562180-22-005339","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218022005339/primarydocument.xml","form_type":"4"}},{"id":2222934,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2022-06-23T18:09:33.000Z","date":"2022-06-22","kind":"grant","acquired":true,"shares":3109,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"These restricted stock units for common stock vest 100% on the earlier of June 22, 2023 or the date of the next annual meeting of stockholders."}],"balance_after":284439,"source":{"system":"sec-edgar","filing":"0001562180-22-005339","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218022005339/primarydocument.xml","form_type":"4"}},{"id":2233725,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2022-06-13T20:15:49.000Z","date":"2022-06-09","kind":"grant","acquired":true,"shares":27000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests and becomes exercisable in full on the earlier of (A) the first anniversary of the date of grant or (B) immediately prior to the next annual meeting of the Corporation's stockholders after the date of grant, subject to the non-employee director's continued service as a director of the Corporation."}],"balance_after":27000,"derivative":{"exercise_price":1.17,"expiration_date":"2032-06-09","underlying":"Common Stock","underlying_shares":27000},"source":{"system":"sec-edgar","filing":"0000899243-22-022181","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924322022181/doc4.xml","form_type":"4"}},{"id":2280979,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (Right to buy)","published_at":"2022-05-05T20:36:58.000Z","date":"2022-03-01","kind":"grant","acquired":true,"shares":267000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This stock option vests over a four-year period at the rate of 25% on 01/01/2023 and then in 36 equal monthly installments thereafter."}],"balance_after":267000,"derivative":{"exercise_price":13.41,"expiration_date":"2032-03-01","underlying":"Common Stock","underlying_shares":267000},"source":{"system":"sec-edgar","filing":"0001562180-22-003848","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022003848/primarydocument.xml","form_type":"4"}},{"id":2280978,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-05-05T20:36:58.000Z","date":"2022-03-01","kind":"grant","acquired":true,"shares":133500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock unit awards vest over a four-year period at the rate of 25% on 01/01/2023, 25% on 01/01/2024, 25% on 01/01/2025, and 25% on 01/01/2026."}],"balance_after":690388,"source":{"system":"sec-edgar","filing":"0001562180-22-003848","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022003848/primarydocument.xml","form_type":"4"}},{"id":2321742,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-03-22T16:55:27.000Z","date":"2022-03-17","kind":"purchase","acquired":true,"shares":368857,"price":12.2,"value":4500055.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of common stock were acquired by the Reporting Person pursuant to a share purchase agreement in a private placement offering of shares of the Issuer's common stock, which offering closed on March 17, 2022. The issuance of such shares by the Reporting Person was approved by the Issuer's board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended."}],"balance_after":556888,"source":{"system":"sec-edgar","filing":"0001562180-22-002863","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022002863/primarydocument.xml","form_type":"4/A","original_submission_date":"2022-03-21"}},{"id":2323277,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-03-21T17:07:24.000Z","date":"2022-03-17","kind":"grant","acquired":true,"shares":368857,"price":12.2,"value":4500055.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of common stock were acquired by the Reporting Person pursuant to a share purchase agreement in a private placement offering of shares of the Issuer's common stock, which offering closed on March 17, 2022. The issuance of such shares by the Reporting Person was approved by the Issuer's board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended."}],"balance_after":556888,"source":{"system":"sec-edgar","filing":"0001562180-22-002846","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022002846/primarydocument.xml","form_type":"4"}},{"id":2436692,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2022-01-12T21:15:29.000Z","date":"2022-01-11","kind":"sale","acquired":false,"shares":5068,"price":9.6426,"value":48868.6968,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $9.48 to $9.83. The average weighted price was $9.6426. 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":281330,"source":{"system":"sec-edgar","filing":"0001562180-22-000442","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218022000442/primarydocument.xml","form_type":"4"}},{"id":2436691,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2022-01-12T21:15:29.000Z","date":"2022-01-10","kind":"sale","acquired":false,"shares":2369,"price":9.4022,"value":22273.8118,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $9.385 to $9.42. The average weighted price was $9.4022. 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":286398,"source":{"system":"sec-edgar","filing":"0001562180-22-000442","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218022000442/primarydocument.xml","form_type":"4"}},{"id":2438000,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-01-11T17:32:53.000Z","date":"2022-01-07","kind":"sale","acquired":false,"shares":3270,"price":23.9078,"value":78178.506,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.75 to $24.28, inclusive. 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":188031,"source":{"system":"sec-edgar","filing":"0001562180-22-000409","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000156218022000409/primarydocument.xml","form_type":"4"}},{"id":2506791,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":90000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F18","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 16, 2021 and vests over a four-year period, at a rate of 25% on 01/04/2022 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F18","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 16, 2021 and vests over a four-year period, at a rate of 25% on 01/04/2022 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F18","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 16, 2021 and vests over a four-year period, at a rate of 25% on 01/04/2022 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":0,"derivative":{"exercise_price":0,"expiration_date":"2031-02-16","underlying":"Common Stock","underlying_shares":0},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506790,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":65000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F17","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2020 and vests over a four-year period, at a rate of 25% on 01/04/2021 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F17","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2020 and vests over a four-year period, at a rate of 25% on 01/04/2021 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F17","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2020 and vests over a four-year period, at a rate of 25% on 01/04/2021 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":63995,"derivative":{"exercise_price":36.78,"expiration_date":"2030-03-02","underlying":"Common Stock","underlying_shares":63995},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506789,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":100000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F16","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2019 and vests over a four-year period, at a rate of 25% on 01/04/2020 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F16","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2019 and vests over a four-year period, at a rate of 25% on 01/04/2020 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F16","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2019 and vests over a four-year period, at a rate of 25% on 01/04/2020 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":98454,"derivative":{"exercise_price":67.06,"expiration_date":"2029-02-01","underlying":"Common Stock","underlying_shares":98454},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506788,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":120000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F15","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2018 and vests over a four-year period, at a rate of 25% on 01/04/2019 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F15","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2018 and vests over a four-year period, at a rate of 25% on 01/04/2019 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F15","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2018 and vests over a four-year period, at a rate of 25% on 01/04/2019 and in 36 equal monthly installments thereafter. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":118145,"derivative":{"exercise_price":102.24,"expiration_date":"2028-02-01","underlying":"Common Stock","underlying_shares":118145},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506787,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":110000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F14","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2017 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F14","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2017 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F14","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on February 1, 2017 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":108300,"derivative":{"exercise_price":37.66,"expiration_date":"2027-02-01","underlying":"Common Stock","underlying_shares":108300},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506786,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":90000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F13","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 1, 2016 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F13","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 1, 2016 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 1, 2016 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":88609,"derivative":{"exercise_price":25.16,"expiration_date":"2026-03-01","underlying":"Common Stock","underlying_shares":88609},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506785,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":165000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F12","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2015 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2015 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F12","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 2, 2015 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":162450,"derivative":{"exercise_price":48.52,"expiration_date":"2025-03-02","underlying":"Common Stock","underlying_shares":162450},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506784,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"disposition_to_issuer","acquired":false,"shares":165000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F11","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 3, 2014 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"shares","element":"transactionShares","label":"F11","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 3, 2014 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F11","text":"Represents options to purchase bluebird common stock awarded to the reporting person prior to the Separation. In connection with the Separation, the shares of common stock underlying this award were adjusted pursuant to the EMA such that the reporting person received options to purchase shares of 2seventy common stock to preserve the value associated with the original award (see footnotes 2 and 3). This option was originally granted on March 3, 2014 and is fully vested and exercisable as of the date hereof. The exercise price of the option has been adjusted based on the conversion ratio described in footnotes 2 and 3."}],"balance_after":162450,"derivative":{"exercise_price":12.19,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":162450},"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506783,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":0,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F9","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on August 2, 2021 and vests upon the satisfaction of certain performance criteria."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F10","text":"762 shares were acquired under the bluebird bio, Inc. employee stock purchase plan."}],"balance_after":288767,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506782,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":0,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F8","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on August 2, 2021 and vests over a two-year period at the rate of 40% on August 2, 2022 and 60% on August 2, 2023."}],"balance_after":288005,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506781,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":0,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F7","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on February 16, 2021 and vests over a four-year period at a rate of 25% on 01/04/2022, 25% on 01/04/2023, 25% on 01/04/2024, and 25% on 01/04/2025."}],"balance_after":288005,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506780,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":0,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F6","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award vests upon the satisfaction of certain performance criteria."}],"balance_after":288005,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506779,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":23998,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F5","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA such that the reporting person received restricted stock units of 2seventy to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on March 2, 2020 and vests over a four-year period at the rate of 25% on 01/04/2021, 25% on 01/04/2022, 25% on 01/04/2023, and 25% on 01/04/2024."}],"balance_after":288005,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506778,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":12306,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."},{"field":"security","element":"securityTitle","label":"F4","text":"Represents restricted stock units awarded to the reporting person prior to the Separation. In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the EMA such that the reporting person received restricted stock units of 2seventy to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on February 1, 2019 and vests over a four-year period at a rate of 25% on 01/04/2020, 25% on 01/04/2021, 25% on 01/04/2022, and 25% on 01/04/2023."}],"balance_after":264007,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2506777,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-11-17T08:56:48.000Z","date":"2021-11-11","kind":"other","acquired":true,"shares":7384,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Represents restricted stock units awarded to the reporting person prior to the separation (the \"Separation\") of 2seventy bio, Inc. (\"2seventy\") from bluebird bio, Inc. (\"bluebird\"). In connection with the Separation, the restricted stock units underlying this award were adjusted pursuant to the Employee Matters Agreement by and between 2seventy and bluebird (the \"EMA\") such that the reporting person received restricted stock units of 2seventy to preserve the value associated with the original restricted stock unit award (see footnotes 2 and 3). This restricted stock unit award was originally granted on February 1, 2018 and vests 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."},{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\") and the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird bio common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"bluebird equity awards granted on or after January 1, 2021, such equity awards continued as bluebird equity awards, subject to adjustment. The adjusted number of shares of bluebird common stock underlying such equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the bluebird Post-Distribution VWAP."}],"balance_after":251701,"source":{"system":"sec-edgar","filing":"0001628280-21-023648","document":"wf-form4_163715739431374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000162828021023648/wf-form4_163715739431374.xml","form_type":"4"}},{"id":2511001,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":57957,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F17","text":"This option vests over a four-year period, at a rate of 25% on 01/04/2022 and in 36 equal monthly installments thereafter (see footnotes 2 and 3)."}],"balance_after":57957,"derivative":{"exercise_price":44.17,"expiration_date":"2031-02-16","underlying":"Common Stock","underlying_shares":57957},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2511000,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":21331,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F16","text":"This option vests over a four-year period, at a rate of 25% on 01/04/2021 and in 36 equal monthly installments thereafter (see footnotes 2 and 3)."}],"balance_after":21331,"derivative":{"exercise_price":114.67,"expiration_date":"2030-03-02","underlying":"Common Stock","underlying_shares":21331},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510999,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":32817,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F15","text":"This option vests over a four-year period, at a rate of 25% on 01/04/2020 and in 36 equal monthly installments thereafter (see footnotes 2 and 3)."}],"balance_after":32817,"derivative":{"exercise_price":209.06,"expiration_date":"2029-02-01","underlying":"Common Stock","underlying_shares":32817},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510998,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":39381,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F14","text":"This option vests over a four-year period, at a rate of 25% on 01/04/2019 and in 36 equal monthly installments thereafter (see footnotes 2 and 3)."}],"balance_after":39381,"derivative":{"exercise_price":318.73,"expiration_date":"2028-02-01","underlying":"Common Stock","underlying_shares":39381},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510997,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":36099,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"This option is fully vested and exercisable as of the date hereof (see footnotes 2 and 3)."}],"balance_after":36099,"derivative":{"exercise_price":117.4,"expiration_date":"2027-02-01","underlying":"Common Stock","underlying_shares":36099},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510996,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":29535,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"This option is fully vested and exercisable as of the date hereof (see footnotes 2 and 3)."}],"balance_after":29535,"derivative":{"exercise_price":78.44,"expiration_date":"2026-03-01","underlying":"Common Stock","underlying_shares":29535},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510995,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":54149,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"This option is fully vested and exercisable as of the date hereof (see footnotes 2 and 3)."}],"balance_after":54149,"derivative":{"exercise_price":151.25,"expiration_date":"2025-03-02","underlying":"Common Stock","underlying_shares":54149},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510994,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":54149,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F12","text":"Represents options to purchase shares of 2seventy's common stock granted to the reporting person in connection with the Separation (see footnotes 2 and 3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"This option is fully vested and exercisable as of the date hereof (see footnotes 2 and 3)."}],"balance_after":54149,"derivative":{"exercise_price":38,"expiration_date":"2024-03-03","underlying":"Common Stock","underlying_shares":54149},"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510993,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":50425,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."},{"field":"security","element":"securityTitle","label":"F8","text":"In connection with the Separation, the reporting person received a grant of restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnotes 2 and 3). This restricted stock unit award vests upon the satisfaction of certain performance criteria."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F9","text":"Includes 81,685 shares of 2seventy's common stock received in a pro rata distribution by bluebird as a result of the Separation."}],"balance_after":191301,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510992,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":33038,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."},{"field":"security","element":"securityTitle","label":"F7","text":"In connection with the Separation, the reporting person received a grant of restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnotes 2 and 3). This restricted stock unit award vests over a two-year period at the rate of 40% on 08/02/2022 and 60% on 08/02/2023."}],"balance_after":59191,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510991,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":11591,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."},{"field":"security","element":"securityTitle","label":"F6","text":"In connection with the Separation, the reporting person received a grant of restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnotes 2 and 3). This restricted stock unit award vests over a four-year period at the rate of 25% on 01/04/2022, 25% on 01/04/2023, 25% on 01/04/2024, and 25% on 01/04/2025."}],"balance_after":26153,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510990,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":7999,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."},{"field":"security","element":"securityTitle","label":"F5","text":"In connection with the Separation, the reporting person received a grant of restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnotes 2 and 3). This restricted stock unit award vests over a four-year period at the rate of 25% on 01/04/2021, 25% on 01/04/2022, 25% on 01/04/2023, and 25% on 01/04/2024."}],"balance_after":14562,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510989,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":4102,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."},{"field":"security","element":"securityTitle","label":"F4","text":"In connection with the Separation, the reporting person received a grant of restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnotes 2 and 3). This restricted stock unit award vests over a four-year period at a rate of 25% on 01/04/2020, 25% on 01/04/2021, 25% on 01/04/2022, and 25% on 01/04/2023 ."}],"balance_after":6563,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2510988,"issuer":{"id":79756,"kind":"organization","name":"2seventy bio, Inc.","symbol":"TSVT"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-11-16T06:43:20.000Z","date":"2021-11-11","kind":"grant","acquired":true,"shares":2461,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"In connection with the separation (the \"Separation\") of seventy bio, Inc. (\"2seventy\") from bluebird bio, Inc. (\"bluebird\"), the reporting person received restricted stock units, each representing the right to receive a share of 2seventy's common stock, as a result of the adjustment of existing bluebird restricted stock units prior to the Separation (see footnote 16). This restricted stock unit award vests 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."},{"field":"security","element":"securityTitle","label":"F2","text":"bluebird equity awards granted prior to January 1, 2021 were converted into equity awards of both bluebird and 2seventy. The number of shares underlying the converted bluebird equity awards was determined by multiplying the number of shares underlying the existing bluebird equity award by a fraction, the numerator of which is the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately prior to the distribution date (the \"bluebird Pre-Distribution VWAP\"), the denominator of which is the sum of (1) the volume-weighted average trading price of 2seventy common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"2seventy VWAP\") multiplied by the distribution ratio and (2) the volume-weighted average trading price of bluebird common stock (trading \"regular way\") on the five trading days immediately following the distribution date (the \"bluebird Post-Distribution VWAP\")."},{"field":"security","element":"securityTitle","label":"F3","text":"The number of shares underlying the converted 2seventy equity awards was determined by multiplying the number of shares underlying the existing bluebird equity awards by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the sum of (1) the 2seventy VWAP multiplied by the distribution ratio and (2) the quotient obtained by dividing the bluebird Post-Distribution VWAP by the distribution ratio. bluebird equity awards granted on or after January 1, 2021, such equity awards were converted into 2seventy equity awards. The number of shares of 2seventy common stock underlying such converted equity awards is equal to the number of shares of bluebird common stock subject to the equity award immediately prior to the distribution multiplied by a fraction, the numerator of which is the bluebird Pre-Distribution VWAP and the denominator of which is the 2seventy VWAP."}],"balance_after":2461,"source":{"system":"sec-edgar","filing":"0001628280-21-023470","document":"wf-form4_163706292470660.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1860782/000162828021023470/wf-form4_163706292470660.xml","form_type":"4"}},{"id":2614617,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-08-04T16:53:05.000Z","date":"2021-08-02","kind":"grant","acquired":true,"shares":51303,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"Restricted stock unit awards shall vest upon the satisfaction of certain performance criteria."}],"balance_after":409299,"source":{"system":"sec-edgar","filing":"0001562180-21-005173","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021005173/primarydocument.xml","form_type":"4"}},{"id":2614616,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-08-04T16:53:05.000Z","date":"2021-08-02","kind":"grant","acquired":true,"shares":51304,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock unit awards vest over a two-year period at the rate of 40% on August 2, 2022 and 60% on August 2, 2023."}],"balance_after":357996,"source":{"system":"sec-edgar","filing":"0001562180-21-005173","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021005173/primarydocument.xml","form_type":"4"}},{"id":2669742,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-06-14T21:12:34.000Z","date":"2021-06-10","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests and becomes exercisable in full on the earlier of (A) the first anniversary of the date of grant or (B) immediately prior to the next annual meeting of the Corporation's stockholders after the date of grant, subject to the non-employee director's continued service as a director of the Corporation."}],"balance_after":15000,"derivative":{"exercise_price":3.67,"expiration_date":"2031-06-10","underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0000899243-21-023614","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924321023614/doc4.xml","form_type":"4"}},{"id":2714281,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-05-13T16:57:29.000Z","date":"2021-05-12","kind":"gift","acquired":true,"shares":123000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Nick Leschly Irrevocable GST Trust of 2019"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction represents a gift of securities by the reporting person's indirectly owned revocable trust account to The Nick Leschly Irrevocable GST Trust of 2019 (the \"Irrevocable Trust\") designed for the benefit of his spouse and his daughters. The reporting person's brother is the trustee of the Irrevocable Trust. The reporting person disclaims beneficial ownership of the Irrevocable Trust."}],"balance_after":123000,"source":{"system":"sec-edgar","filing":"0001562180-21-003461","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021003461/primarydocument.xml","form_type":"4"}},{"id":2714280,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-05-13T16:57:29.000Z","date":"2021-05-12","kind":"gift","acquired":false,"shares":123000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Nick Leschly 2001 Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction represents a gift of securities by the reporting person's indirectly owned revocable trust account to The Nick Leschly Irrevocable GST Trust of 2019 (the \"Irrevocable Trust\") designed for the benefit of his spouse and his daughters. The reporting person's brother is the trustee of the Irrevocable Trust. The reporting person disclaims beneficial ownership of the Irrevocable Trust."}],"balance_after":45699,"source":{"system":"sec-edgar","filing":"0001562180-21-003461","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021003461/primarydocument.xml","form_type":"4"}},{"id":2726913,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-05-05T16:44:15.000Z","date":"2021-05-03","kind":"sale","acquired":false,"shares":444,"price":30.1511,"value":13387.0884,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $29.85 to $30.42. The average weighted price was $30.1511. 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":306692,"source":{"system":"sec-edgar","filing":"0001562180-21-003231","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021003231/primarydocument.xml","form_type":"4"}},{"id":2754143,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-04-07T16:43:37.000Z","date":"2021-04-05","kind":"sale","acquired":false,"shares":444,"price":30.2051,"value":13411.0644,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $30.05 to $30.52. The average weighted price was $30.2051. 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":307136,"source":{"system":"sec-edgar","filing":"0001562180-21-002739","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021002739/primarydocument.xml","form_type":"4"}},{"id":2802860,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-03-08T16:50:59.000Z","date":"2021-03-04","kind":"exercise","acquired":false,"shares":203355,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option to purchase shares of our common stock was granted on January 16, 2013 with performance-based criteria that was met on each of January 1, 2013, April 1, 2013, May 1, 2013 and June 24, 2013.  The shares underlying these options vested as follows:  1) 25% options vested on January 1, 2014, with the remainder of the shares vesting in equal monthly installments over the following three years, 2) 25% options vested on April 1, 2014, with the remainder of the shares vesting in equal monthly installments over the following three years, 3) 25% options vested on May 1, 2014, with the remainder of the shares vesting in equal monthly installments over the following three years, and 4) 25% options vested on July 1, 2014, 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":203355},"source":{"system":"sec-edgar","filing":"0001562180-21-002075","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021002075/primarydocument.xml","form_type":"4"}},{"id":2802859,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-03-08T16:50:59.000Z","date":"2021-03-04","kind":"exercise","acquired":true,"shares":203355,"price":5.5004,"value":1118533.842,"ownership":{"direct":true},"balance_after":307580,"source":{"system":"sec-edgar","filing":"0001562180-21-002075","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021002075/primarydocument.xml","form_type":"4"}},{"id":2808504,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-03-04T16:46:39.000Z","date":"2021-03-02","kind":"sale","acquired":false,"shares":444,"price":29.5819,"value":13134.3636,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $29.31 to $29.92. The average weighted price was $29.5819. 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":104225,"source":{"system":"sec-edgar","filing":"0001562180-21-001973","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021001973/primarydocument.xml","form_type":"4"}},{"id":2849561,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2021-02-18T17:22:28.000Z","date":"2021-02-16","kind":"grant","acquired":true,"shares":90000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This stock option vests over a four-year period at the rate of 25% on 01/04/2022 and then in 36 equal monthly installments thereafter."}],"balance_after":90000,"derivative":{"exercise_price":28.44,"expiration_date":"2031-02-16","underlying":"Common Stock","underlying_shares":90000},"source":{"system":"sec-edgar","filing":"0001562180-21-001271","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021001271/primarydocument.xml","form_type":"4"}},{"id":2849560,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-18T17:22:28.000Z","date":"2021-02-16","kind":"grant","acquired":true,"shares":18000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock unit awards vest over a four-year period at the rate of 25% on 01/04/2022, 25% on 01/04/2023, 25% on 01/04/2024, and 25% on 01/04/2025."}],"balance_after":104669,"source":{"system":"sec-edgar","filing":"0001562180-21-001271","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021001271/primarydocument.xml","form_type":"4"}},{"id":2879048,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-04T16:04:01.000Z","date":"2021-02-02","kind":"sale","acquired":false,"shares":594,"price":45.9253,"value":27279.6282,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $45.55 to $46.25. The average weighted price was $45.9253. 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":86669,"source":{"system":"sec-edgar","filing":"0001562180-21-000910","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021000910/primarydocument.xml","form_type":"4"}},{"id":2912091,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-08T18:18:13.000Z","date":"2021-01-06","kind":"sale","acquired":false,"shares":4222,"price":45.4635,"value":191946.897,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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":"F4","text":"The range in prices for the transaction reported on this line was $45.25 to $45.83. The average weighted price was $45.4635. 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":87263,"source":{"system":"sec-edgar","filing":"0001562180-21-000269","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021000269/primarydocument.xml","form_type":"4"}},{"id":2912090,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-08T18:18:13.000Z","date":"2021-01-06","kind":"sale","acquired":false,"shares":5873,"price":44.7586,"value":262867.2578,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $44.25 to $45.24. The average weighted price was $44.7586. 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":91485,"source":{"system":"sec-edgar","filing":"0001562180-21-000269","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021000269/primarydocument.xml","form_type":"4"}},{"id":2912089,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-08T18:18:13.000Z","date":"2021-01-05","kind":"sale","acquired":false,"shares":333,"price":44.9522,"value":14969.0826,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","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 $44.71 to $45.09. The average weighted price was $44.9522. 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":97358,"source":{"system":"sec-edgar","filing":"0001562180-21-000269","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218021000269/primarydocument.xml","form_type":"4"}},{"id":2956420,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-12-04T16:48:11.000Z","date":"2020-12-02","kind":"sale","acquired":false,"shares":14,"price":46.5,"value":651.0,"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."}],"balance_after":97691,"source":{"system":"sec-edgar","filing":"0001562180-20-007077","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020007077/primarydocument.xml","form_type":"4"}},{"id":2956419,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-12-04T16:48:11.000Z","date":"2020-12-02","kind":"sale","acquired":false,"shares":430,"price":46.1895,"value":19861.485,"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 $45.48 to $46.37. The average weighted price was $46.1895. 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":97705,"source":{"system":"sec-edgar","filing":"0001562180-20-007077","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020007077/primarydocument.xml","form_type":"4"}},{"id":2992506,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-11-04T16:04:57.000Z","date":"2020-11-02","kind":"sale","acquired":false,"shares":45,"price":54.434,"value":2449.53,"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":"F4","text":"The range in prices for the transaction reported on this line was $54.33 to $54.48. The average weighted price was $54.4340. 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":98135,"source":{"system":"sec-edgar","filing":"0001562180-20-006543","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020006543/primarydocument.xml","form_type":"4"}},{"id":2992505,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-11-04T16:04:57.000Z","date":"2020-11-02","kind":"sale","acquired":false,"shares":80,"price":53.8272,"value":4306.176,"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 $53.28 to $54.10. The average weighted price was $53.8272. 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":98180,"source":{"system":"sec-edgar","filing":"0001562180-20-006543","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020006543/primarydocument.xml","form_type":"4"}},{"id":2992504,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-11-04T16:04:57.000Z","date":"2020-11-02","kind":"sale","acquired":false,"shares":319,"price":52.5087,"value":16750.2753,"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 $52.25 to $53.08. The average weighted price was $52.5087. 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":98260,"source":{"system":"sec-edgar","filing":"0001562180-20-006543","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020006543/primarydocument.xml","form_type":"4"}},{"id":3011561,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-10-06T16:05:53.000Z","date":"2020-10-02","kind":"sale","acquired":false,"shares":450,"price":52.765,"value":23744.25,"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 $52.48 to $53.09. The average weighted price was $52.765. 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":98579,"source":{"system":"sec-edgar","filing":"0001562180-20-006302","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020006302/primarydocument.xml","form_type":"4"}},{"id":3036382,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-09-08T16:07:26.000Z","date":"2020-09-03","kind":"sale","acquired":false,"shares":431,"price":58.6018,"value":25257.3758,"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 $58.468 to $58.77. The average weighted price was $58.6018. 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":99029,"source":{"system":"sec-edgar","filing":"0001562180-20-005918","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020005918/primarydocument.xml","form_type":"4"}},{"id":3067187,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-08-05T16:05:59.000Z","date":"2020-08-03","kind":"sale","acquired":false,"shares":112,"price":60.9811,"value":6829.8832,"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 $60.83 to $61.00. The average weighted price was $60.9811. 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":99460,"source":{"system":"sec-edgar","filing":"0001562180-20-005314","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020005314/primarydocument.xml","form_type":"4"}},{"id":3067186,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-08-05T16:05:59.000Z","date":"2020-08-03","kind":"sale","acquired":false,"shares":332,"price":60.3182,"value":20025.6424,"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 $59.75 to $60.72. The average weighted price was $60.3182. 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":99572,"source":{"system":"sec-edgar","filing":"0001562180-20-005314","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020005314/primarydocument.xml","form_type":"4"}},{"id":3087360,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-07-07T17:19:10.000Z","date":"2020-07-02","kind":"sale","acquired":false,"shares":443,"price":61.5728,"value":27276.7504,"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 $61.27 to $61.88. The average weighted price was $61.5728. 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":99904,"source":{"system":"sec-edgar","filing":"0001562180-20-005059","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020005059/primarydocument.xml","form_type":"4"}},{"id":3118166,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2020-06-08T21:30:41.000Z","date":"2020-06-04","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option vests and becomes exercisable in full on the earlier of (A) the first anniversary of the date of grant or (B) immediately prior to the next annual meeting of the Corporation's stockholders after the date of grant, subject to the non-employee director's continued service as a director of the Corporation."}],"balance_after":15000,"derivative":{"exercise_price":2.22,"expiration_date":"2030-06-04","underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0000899243-20-015645","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924320015645/doc4.xml","form_type":"4"}},{"id":3121920,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-06-04T17:44:12.000Z","date":"2020-06-02","kind":"sale","acquired":false,"shares":341,"price":64.2432,"value":21906.9312,"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 $63.76 to $64.30. The average weighted price was $64.2432. 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":100347,"source":{"system":"sec-edgar","filing":"0001562180-20-004288","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020004288/primarydocument.xml","form_type":"4"}},{"id":3121919,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-06-04T17:44:12.000Z","date":"2020-06-02","kind":"sale","acquired":false,"shares":103,"price":63.3626,"value":6526.3478,"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 $62.76 to $63.57. The average weighted price was $63.3626. 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":100688,"source":{"system":"sec-edgar","filing":"0001562180-20-004288","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020004288/primarydocument.xml","form_type":"4"}},{"id":3160907,"issuer":{"id":78923,"kind":"organization","name":"bluebird bio, Inc.","symbol":"BLUE"},"owners":[{"id":78924,"kind":"person","name":"Leschly Nick","position":1,"cik":"0001578408","reported_name":"Leschly Nick","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-05-05T16:05:59.000Z","date":"2020-05-01","kind":"grant","acquired":true,"shares":11384,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock units for common stock to vest on a monthly basis over a 12-month period with a vesting commencement date on May 1, 2020."}],"balance_after":100791,"source":{"system":"sec-edgar","filing":"0001562180-20-003353","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1293971/000156218020003353/primarydocument.xml","form_type":"4"}}],"next_cursor":"2020-05-05T16:05:59.000000Z,3160907"}