<SEC-DOCUMENT>0001558370-23-005689-index.html : 20230410
<SEC-HEADER>0001558370-23-005689.hdr.sgml : 20230410
<ACCEPTANCE-DATETIME>20230410164425
ACCESSION NUMBER:		0001558370-23-005689
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20230608
FILED AS OF DATE:		20230410
DATE AS OF CHANGE:		20230410

FILER:

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

	FILING VALUES:
		FORM TYPE:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39319
		FILM NUMBER:		23811581

	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>PRE 14A
<SEQUENCE>1
<FILENAME>tmb-20230608xpre14a.htm
<DESCRIPTION>PRE 14A
<TEXT>
Document 1 - file: tmb-20230608xpre14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>tmb-20230608xpre14a_a003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: tmb-20230608xpre14a_a003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>tmb-20230608xpre14a_bg001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: tmb-20230608xpre14a_bg001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>tmb-20230608xpre14a_bg002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: tmb-20230608xpre14a_bg002.jpg

</DOCUMENT>
</SEC-DOCUMENT>