<SEC-DOCUMENT>0001104659-21-133670-index.html : 20211103
<SEC-HEADER>0001104659-21-133670.hdr.sgml : 20211103
<ACCEPTANCE-DATETIME>20211103163111
ACCESSION NUMBER:		0001104659-21-133670
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20211103
DATE AS OF CHANGE:		20211103
GROUP MEMBERS:		5AM OPPORTUNITIES I (GP), LLC
GROUP MEMBERS:		5AM OPPORTUNITIES I, L.P.
GROUP MEMBERS:		5AM PARTNERS V, LLC
GROUP MEMBERS:		ANDREW J. SCHWAB
GROUP MEMBERS:		DR. KUSH PARMAR
GROUP MEMBERS:		DR. SCOTT M. ROCKLAGE

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cabaletta Bio, Inc.
		CENTRAL INDEX KEY:			0001759138
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91178
		FILM NUMBER:		211375947

	BUSINESS ADDRESS:	
		STREET 1:		2929 ARCH STREET
		STREET 2:		SUITE 600
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19104
		BUSINESS PHONE:		(267) 759-3100

	MAIL ADDRESS:	
		STREET 1:		2929 ARCH STREET
		STREET 2:		SUITE 600
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19104

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			5AM Ventures V, L.P.
		CENTRAL INDEX KEY:			0001674324
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		2200 SAND HILL ROAD, SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		(650) 233-8600

	MAIL ADDRESS:	
		STREET 1:		2200 SAND HILL ROAD, SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>tm2131780d1_sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
Document 1 - file: tm2131780d1_sc13da.htm

</DOCUMENT>
</SEC-DOCUMENT>