<SEC-DOCUMENT>0001558370-25-005268-index.html : 20250423
<SEC-HEADER>0001558370-25-005268.hdr.sgml : 20250423
<ACCEPTANCE-DATETIME>20250423161708
ACCESSION NUMBER:		0001558370-25-005268
CONFORMED SUBMISSION TYPE:	ARS
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241231
FILED AS OF DATE:		20250423
DATE AS OF CHANGE:		20250423
EFFECTIVENESS DATE:		20250423

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Generation Bio Co.
		CENTRAL INDEX KEY:			0001733294
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				814301281
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		ARS
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39319
		FILM NUMBER:		25861718

	BUSINESS ADDRESS:	
		STREET 1:		301 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		857-529-5908

	MAIL ADDRESS:	
		STREET 1:		301 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
</SEC-HEADER>
<DOCUMENT>
<TYPE>ARS
<SEQUENCE>1
<FILENAME>gbio-20241231xars.pdf
<DESCRIPTION>ARS
<TEXT>
Document 1 - file: gbio-20241231xars.pdf

</DOCUMENT>
</SEC-DOCUMENT>