<SEC-DOCUMENT>0000899243-20-017104-index.html : 20200618
<SEC-HEADER>0000899243-20-017104.hdr.sgml : 20200618
<ACCEPTANCE-DATETIME>20200618172931
ACCESSION NUMBER:		0000899243-20-017104
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200616
FILED AS OF DATE:		20200618
DATE AS OF CHANGE:		20200618

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Casdin Capital, LLC
		CENTRAL INDEX KEY:			0001534261
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39319
		FILM NUMBER:		20973652

	BUSINESS ADDRESS:	
		STREET 1:		1350 AVENUE OF THE AMERICAS
		STREET 2:		SUITE 2600
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212.300.5575

	MAIL ADDRESS:	
		STREET 1:		1350 AVENUE OF THE AMERICAS
		STREET 2:		SUITE 2600
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Casdin Eli
		CENTRAL INDEX KEY:			0001534264

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39319
		FILM NUMBER:		20973653

	MAIL ADDRESS:	
		STREET 1:		1350 AVENUE OF THE AMERICAS
		STREET 2:		SUITE 1140
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

ISSUER:		

	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

	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>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
Document 1 - file: doc4.html

Document 1 - RAW XML: doc4.xml

</DOCUMENT>
</SEC-DOCUMENT>