<SEC-DOCUMENT>0001209191-21-055343-index.html : 20210909
<SEC-HEADER>0001209191-21-055343.hdr.sgml : 20210909
<ACCEPTANCE-DATETIME>20210909173454
ACCESSION NUMBER:		0001209191-21-055343
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210907
FILED AS OF DATE:		20210909
DATE AS OF CHANGE:		20210909

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ROCKLAGE SCOTT M
		CENTRAL INDEX KEY:			0001219014

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245297

	MAIL ADDRESS:	
		STREET 1:		179 SANDY POND ROAD
		CITY:			LINCOLN
		STATE:			MA
		ZIP:			01773

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Schwab Andrew J.
		CENTRAL INDEX KEY:			0001598549

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245296

	MAIL ADDRESS:	
		STREET 1:		C/O 5AM VENTURES, 2200 SAND HILL ROAD
		STREET 2:		SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PARMAR KUSH
		CENTRAL INDEX KEY:			0001664281

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245298

	MAIL ADDRESS:	
		STREET 1:		C/O AUDENTES THERAPEUTICS, INC.
		STREET 2:		101 MONTGOMERY ST., SUITE 2650
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94104

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Partners V, LLC
		CENTRAL INDEX KEY:			0001791889
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245299

	BUSINESS ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		650-233-8600

	MAIL ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Opportunities I, L.P.
		CENTRAL INDEX KEY:			0001753000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245300

	BUSINESS ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		415-993-8570

	MAIL ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

REPORTING-OWNER:	

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

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245302

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Opportunities I (GP), LLC
		CENTRAL INDEX KEY:			0001790778
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		211245301

	BUSINESS ADDRESS:	
		STREET 1:		501 2ND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		(650) 233-86000

	MAIL ADDRESS:	
		STREET 1:		501 2ND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

ISSUER:		

	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

	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
</SEC-HEADER>
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