<SEC-DOCUMENT>0001104659-21-010771-index.html : 20210202
<SEC-HEADER>0001104659-21-010771.hdr.sgml : 20210202
<ACCEPTANCE-DATETIME>20210202130215
ACCESSION NUMBER:		0001104659-21-010771
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210202
DATE AS OF CHANGE:		20210202
GROUP MEMBERS:		ATLAS VENTURE ASSOCIATES IX, L.P.
GROUP MEMBERS:		ATLAS VENTURE ASSOCIATES IX, LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cogent Biosciences, Inc.
		CENTRAL INDEX KEY:			0001622229
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				465308248
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90431
		FILM NUMBER:		21580007

	BUSINESS ADDRESS:	
		STREET 1:		200 CAMBRIDGE PARK DRIVE
		STREET 2:		SUITE 3100
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140
		BUSINESS PHONE:		617-945-5576

	MAIL ADDRESS:	
		STREET 1:		200 CAMBRIDGE PARK DRIVE
		STREET 2:		SUITE 3100
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Unum Therapeutics Inc.
		DATE OF NAME CHANGE:	20180402

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Unum Therapeutics, Inc.
		DATE OF NAME CHANGE:	20141014

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Atlas Venture Fund IX, L.P.
		CENTRAL INDEX KEY:			0001671219
		IRS NUMBER:				461357890
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1012

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		46 WAREHAM STREET, FLOOR 3
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02118
		BUSINESS PHONE:		617-588-2694

	MAIL ADDRESS:	
		STREET 1:		46 WAREHAM STREET, FLOOR 3
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02118
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>a21-4941_1sc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: a21-4941_1sc13ga.htm

</DOCUMENT>
</SEC-DOCUMENT>