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The filing of this Form 4 and any statements included herein shall not be deemed to be an admission that such entities and individuals are members of such a group."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Since the number of reporting persons that may be listed on a Form 4 is limited, the entities and individuals listed in these footnotes that are not reporting persons on this Form 4 are filing one or more additional Forms 4 on the date hereof as reporting persons with respect to the securities described herein (each, a \"Parallel Form 4\"). Information regarding these entities and individuals is included in this Form 4 for purposes of clarification and convenience only, and is duplicative of the information reported in any Parallel Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"The amount of securities shown in this row is owned directly by Zone Healthcare Holdings, LLC (\"ZHH LLC\")."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F10","text":"Due to the dilutive effect of the IPO, as of the completion of the IPO no reporting person on or otherwise referred to in this Form 4 or any Parallel Form 4 has beneficial ownership of more than 10% of the outstanding class of Common Stock."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1518819},"source":{"system":"sec-edgar","filing":"0001214659-20-005727","document":"marketforms-49046.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/909661/000121465920005727/marketforms-49046.xml","form_type":"4"}},{"id":3107794,"issuer":{"id":67174,"kind":"organization","name":"Generation Bio Co.","symbol":"GBIO"},"owners":[{"id":148402,"kind":"organization","name":"Zone Healthcare Holdings, LLC","position":1,"cik":"0001814952","reported_name":"Zone Healthcare Holdings, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Member of Group Owning 10%"}},{"id":103448,"kind":"organization","name":"FARALLON CAPITAL MANAGEMENT, L.L.C.","position":2,"cik":"0000909661","reported_name":"FARALLON CAPITAL MANAGEMENT LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of ZHH LLC"}},{"id":76242,"kind":"organization","name":"FARALLON PARTNERS L L C/CA","position":3,"cik":"0001040153","reported_name":"FARALLON PARTNERS L L C/CA","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Farallon General Partner"}},{"id":76244,"kind":"person","name":"Dreyfuss Philip D","position":4,"cik":"0001693981","reported_name":"Dreyfuss Philip D","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":121554,"kind":"person","name":"Fisch Michael B.","position":5,"cik":"0001611816","reported_name":"Fisch Michael B.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76246,"kind":"person","name":"FRIED RICHARD B","position":6,"cik":"0001245637","reported_name":"FRIED RICHARD B","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76249,"kind":"person","name":"Kim David T","position":7,"cik":"0001595643","reported_name":"Kim David T","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76250,"kind":"person","name":"Linn Michael G","position":8,"cik":"0001495856","reported_name":"Linn Michael G","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76260,"kind":"person","name":"PATEL RAJIV A","position":9,"cik":"0001275110","reported_name":"PATEL RAJIV A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76261,"kind":"person","name":"Roberts Thomas G. 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The filing of this Form 4 and any statements included herein shall not be deemed to be an admission that such entities and individuals are members of such a group."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Since the number of reporting persons that may be listed on a Form 4 is limited, the entities and individuals listed in these footnotes that are not reporting persons on this Form 4 are filing one or more additional Forms 4 on the date hereof as reporting persons with respect to the securities described herein (each, a \"Parallel Form 4\"). Information regarding these entities and individuals is included in this Form 4 for purposes of clarification and convenience only, and is duplicative of the information reported in any Parallel Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"The amount of securities shown in this row is owned directly by Zone Healthcare Holdings, LLC (\"ZHH LLC\")."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F10","text":"Due to the dilutive effect of the IPO, as of the completion of the IPO no reporting person on or otherwise referred to in this Form 4 or any Parallel Form 4 has beneficial ownership of more than 10% of the outstanding class of Common Stock."}],"balance_after":1918819,"source":{"system":"sec-edgar","filing":"0001214659-20-005727","document":"marketforms-49046.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/909661/000121465920005727/marketforms-49046.xml","form_type":"4"}},{"id":3107793,"issuer":{"id":67174,"kind":"organization","name":"Generation Bio Co.","symbol":"GBIO"},"owners":[{"id":148402,"kind":"organization","name":"Zone Healthcare Holdings, LLC","position":1,"cik":"0001814952","reported_name":"Zone Healthcare Holdings, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Member of Group Owning 10%"}},{"id":103448,"kind":"organization","name":"FARALLON CAPITAL MANAGEMENT, L.L.C.","position":2,"cik":"0000909661","reported_name":"FARALLON CAPITAL MANAGEMENT LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Manager of ZHH LLC"}},{"id":76242,"kind":"organization","name":"FARALLON PARTNERS L L C/CA","position":3,"cik":"0001040153","reported_name":"FARALLON PARTNERS L L C/CA","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Farallon General Partner"}},{"id":76244,"kind":"person","name":"Dreyfuss Philip D","position":4,"cik":"0001693981","reported_name":"Dreyfuss Philip D","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":121554,"kind":"person","name":"Fisch Michael B.","position":5,"cik":"0001611816","reported_name":"Fisch Michael B.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76246,"kind":"person","name":"FRIED RICHARD B","position":6,"cik":"0001245637","reported_name":"FRIED RICHARD B","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76249,"kind":"person","name":"Kim David T","position":7,"cik":"0001595643","reported_name":"Kim David T","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76250,"kind":"person","name":"Linn Michael G","position":8,"cik":"0001495856","reported_name":"Linn Michael G","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76260,"kind":"person","name":"PATEL RAJIV A","position":9,"cik":"0001275110","reported_name":"PATEL RAJIV A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"Managing Member"}},{"id":76261,"kind":"person","name":"Roberts Thomas G. 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Information regarding these entities and individuals is included in this Form 4 for purposes of clarification and convenience only, and is duplicative of the information reported in any Parallel Form 4."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F4","text":"The amount of securities shown in this row is owned directly by Zone Healthcare Holdings, LLC (\"ZHH LLC\")."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F10","text":"Due to the dilutive effect of the IPO, as of the completion of the IPO no reporting person on or otherwise referred to in this Form 4 or any Parallel Form 4 has beneficial ownership of more than 10% of the outstanding class of Common Stock."}],"balance_after":1518819,"source":{"system":"sec-edgar","filing":"0001214659-20-005727","document":"marketforms-49046.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/909661/000121465920005727/marketforms-49046.xml","form_type":"4"}}]}